{ "content": [ { "type": "text", "text": "# ffmpeg-all (man)\n\n## NAME\n\nffmpeg - ffmpeg media converter\n\n## SYNOPSIS\n\nffmpeg [globaloptions] {[inputfileoptions] -i inputurl} ... {[outputfileoptions]\noutputurl} ...\n\n## DESCRIPTION\n\nffmpeg is a universal media converter. It can read a wide variety of inputs - including live\ngrabbing/recording devices - filter, and transcode them into a plethora of output formats.\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS**\n- **DESCRIPTION**\n- **DETAILED DESCRIPTION** (2 subsections)\n- **STREAM SELECTION** (2 subsections)\n- **OPTIONS** (193 subsections)\n- **EXAMPLES** (3 subsections)\n- **SYNTAX** (223 subsections)\n- **EXPRESSION EVALUATION** (54 subsections)\n- **CODEC OPTIONS**\n- **DECODERS**\n- **VIDEO DECODERS** (16 subsections)\n- **AUDIO DECODERS** (12 subsections)\n- **SUBTITLES DECODERS** (35 subsections)\n- **ENCODERS**\n- **AUDIO ENCODERS** (72 subsections)\n- **VIDEO ENCODERS** (156 subsections)\n- **SUBTITLES ENCODERS** (3 subsections)\n- **BITSTREAM FILTERS** (112 subsections)\n- **FORMAT OPTIONS** (1 subsections)\n- **DEMUXERS** (115 subsections)\n- **MUXERS** (107 subsections)\n- **METADATA**\n- **PROTOCOL OPTIONS**\n- **PROTOCOLS** (165 subsections)\n- **DEVICE OPTIONS**\n- **INPUT DEVICES** (149 subsections)\n- **OUTPUT DEVICES** (57 subsections)\n- **RESAMPLER OPTIONS** (34 subsections)\n- **SCALER OPTIONS** (6 subsections)\n- **FILTERING INTRODUCTION**\n- **GRAPH**\n- **FILTERGRAPH DESCRIPTION** (4 subsections)\n- **TIMELINE EDITING**\n- **CHANGING OPTIONS AT RUNTIME WITH A COMMAND**\n- **OPTIONS FOR FILTERS WITH SEVERAL INPUTS** (4 subsections)\n- **AUDIO FILTERS** (858 subsections)\n- **AUDIO SOURCES** (73 subsections)\n- **AUDIO SINKS** (2 subsections)\n- **VIDEO FILTERS** (1578 subsections)\n- **OPENCL VIDEO FILTERS** (105 subsections)\n- **VAAPI VIDEO FILTERS** (25 subsections)\n- **VULKAN VIDEO FILTERS** (41 subsections)\n- **QSV VIDEO FILTERS** (15 subsections)\n- **VIDEO SOURCES** (107 subsections)\n- **VIDEO SINKS** (2 subsections)\n- **MULTIMEDIA FILTERS** (241 subsections)\n- **MULTIMEDIA SOURCES** (23 subsections)\n- **EXTERNAL LIBRARIES** (24 subsections)\n- **SUPPORTED FILE FORMATS** (791 subsections)\n- **SEE ALSO**\n- **AUTHORS**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n" } ], "structuredContent": { "command": "ffmpeg-all", "section": "", "mode": "man", "summary": "ffmpeg - ffmpeg media converter", "synopsis": "ffmpeg [globaloptions] {[inputfileoptions] -i inputurl} ... {[outputfileoptions]\noutputurl} ...", "tldr_summary": null, "tldr_examples": [], "tldr_source": null, "flags": [ { "flag": "-L", "long": null, "arg": null, "description": "" }, { "flag": "-?", "long": "--help", "arg": null, "description": "Show help. An optional parameter may be specified to print help about a specific item. If no argument is specified, only basic (non advanced) tool options are shown. Possible values of arg are: long Print advanced tool options in addition to the basic tool options. full Print complete list of options, including shared and private options for encoders, decoders, demuxers, muxers, filters, etc. decoder=decodername Print detailed information about the decoder named decodername. Use the -decoders option to get a list of all decoders. encoder=encodername Print detailed information about the encoder named encodername. Use the -encoders option to get a list of all encoders. demuxer=demuxername Print detailed information about the demuxer named demuxername. Use the -formats option to get a list of all demuxers and muxers. muxer=muxername Print detailed information about the muxer named muxername. Use the -formats option to get a list of all muxers and demuxers. filter=filtername Print detailed information about the filter named filtername. Use the -filters option to get a list of all filters. bsf=bitstreamfiltername Print detailed information about the bitstream filter named bitstreamfiltername. Use the -bsfs option to get a list of all bitstream filters. protocol=protocolname Print detailed information about the protocol named protocolname. Use the -protocols option to get a list of all protocols." }, { "flag": "", "long": null, "arg": null, "description": "Show version." }, { "flag": "", "long": null, "arg": null, "description": "Show the build configuration, one option per line." }, { "flag": "", "long": null, "arg": null, "description": "Show available formats (including devices)." }, { "flag": "", "long": null, "arg": null, "description": "Show available demuxers." }, { "flag": "", "long": null, "arg": null, "description": "Show available muxers." }, { "flag": "", "long": null, "arg": null, "description": "Show available devices." }, { "flag": "", "long": null, "arg": null, "description": "Show all codecs known to libavcodec. Note that the term 'codec' is used throughout this documentation as a shortcut for what is more correctly called a media bitstream format." }, { "flag": "", "long": null, "arg": null, "description": "Show available decoders." }, { "flag": "", "long": null, "arg": null, "description": "Show all available encoders." }, { "flag": "", "long": null, "arg": null, "description": "Show available bitstream filters." }, { "flag": "", "long": null, "arg": null, "description": "Show available protocols." }, { "flag": "", "long": null, "arg": null, "description": "Show available libavfilter filters." }, { "flag": "", "long": null, "arg": null, "description": "Show available pixel formats." }, { "flag": "", "long": null, "arg": null, "description": "Show available sample formats." }, { "flag": "", "long": null, "arg": null, "description": "Show channel names and standard channel layouts." }, { "flag": "", "long": null, "arg": null, "description": "Show stream dispositions." }, { "flag": "", "long": null, "arg": null, "description": "Show recognized color names." }, { "flag": "", "long": null, "arg": null, "description": "Show autodetected sources of the input device. Some devices may provide system-dependent source names that cannot be autodetected. The returned list cannot be assumed to be always complete. ffmpeg -sources pulse,server=192.168.0.4" }, { "flag": "", "long": null, "arg": null, "description": "Show autodetected sinks of the output device. Some devices may provide system-dependent sink names that cannot be autodetected. The returned list cannot be assumed to be always complete. ffmpeg -sinks pulse,server=192.168.0.4" }, { "flag": "", "long": null, "arg": null, "description": "Set logging level and flags used by the library. The optional flags prefix can consist of the following values: repeat Indicates that repeated log output should not be compressed to the first line and the \"Last message repeated n times\" line will be omitted. level Indicates that log output should add a \"[level]\" prefix to each message line. This can be used as an alternative to log coloring, e.g. when dumping the log to file. Flags can also be used alone by adding a '+'/'-' prefix to set/reset a single flag without affecting other flags or changing loglevel. When setting both flags and loglevel, a '+' separator is expected between the last flags value and before loglevel. loglevel is a string or a number containing one of the following values: quiet, -8 Show nothing at all; be silent. panic, 0 Only show fatal errors which could lead the process to crash, such as an assertion failure. This is not currently used for anything. fatal, 8 Only show fatal errors. These are errors after which the process absolutely cannot continue. error, 16 Show all errors, including ones which can be recovered from. warning, 24 Show all warnings and errors. Any message related to possibly incorrect or unexpected events will be shown. info, 32 Show informative messages during processing. This is in addition to warnings and errors. This is the default value. verbose, 40 Same as \"info\", except more verbose. debug, 48 Show everything, including debugging information. trace, 56 For example to enable repeated log output, add the \"level\" prefix, and set loglevel to \"verbose\": ffmpeg -loglevel repeat+level+verbose -i input output Another example that enables repeated log output without affecting current state of \"level\" prefix flag or loglevel: ffmpeg [...] -loglevel +repeat By default the program logs to stderr. If coloring is supported by the terminal, colors are used to mark errors and warnings. Log coloring can be disabled setting the environment variable AVLOGFORCENOCOLOR, or can be forced setting the environment variable AVLOGFORCECOLOR." }, { "flag": "", "long": null, "arg": null, "description": "Dump full command line and log output to a file named \"program-YYYYMMDD-HHMMSS.log\" in the current directory. This file can be useful for bug reports. It also implies \"-loglevel debug\". Setting the environment variable FFREPORT to any value has the same effect. If the value is a ':'-separated key=value sequence, these options will affect the report; option values must be escaped if they contain special characters or the options delimiter ':' (see the ``Quoting and escaping'' section in the ffmpeg-utils manual). The following options are recognized: file set the file name to use for the report; %p is expanded to the name of the program, %t is expanded to a timestamp, \"%%\" is expanded to a plain \"%\" level set the log verbosity level using a numerical value (see \"-loglevel\"). For example, to output a report to a file named ffreport.log using a log level of 32 (alias for log level \"info\"): FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output Errors in parsing the environment variable are not fatal, and will not appear in the report." }, { "flag": "", "long": null, "arg": null, "description": "Suppress printing banner. All FFmpeg tools will normally show a copyright notice, build options and library versions. This option can be used to suppress printing this information." }, { "flag": "", "long": null, "arg": null, "description": "Allows setting and clearing cpu flags. This option is intended for testing. Do not use it unless you know what you're doing. ffmpeg -cpuflags -sse+mmx ... ffmpeg -cpuflags mmx ... ffmpeg -cpuflags 0 ... Possible flags for this option are: x86 mmx mmxext sse sse2 sse2slow sse3 sse3slow ssse3 atom sse4.1 sse4.2 avx avx2 xop fma3 fma4 3dnow 3dnowext bmi1 bmi2 cmov ARM armv5te armv6 armv6t2 vfp vfpv3 neon setend AArch64 armv8 vfp neon PowerPC altivec Specific Processors pentium2 pentium3 pentium4 k6 k62 athlon athlonxp k8" }, { "flag": "", "long": null, "arg": null, "description": "Override detection of CPU count. This option is intended for testing. Do not use it unless you know what you're doing. ffmpeg -cpucount 2" }, { "flag": "", "long": null, "arg": null, "description": "Set the maximum size limit for allocating a block on the heap by ffmpeg's family of malloc functions. Exercise extreme caution when using this option. Don't use if you do not understand the full consequence of doing so. Default is INTMAX." }, { "flag": "-f", "long": null, "arg": null, "description": "Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases." }, { "flag": "-i", "long": null, "arg": null, "description": "input file url" }, { "flag": "-y", "long": null, "arg": null, "description": "Overwrite output files without asking." }, { "flag": "-n", "long": null, "arg": null, "description": "Do not overwrite output files, and exit immediately if a specified output file already exists." }, { "flag": "", "long": null, "arg": null, "description": "Set number of times input stream shall be looped. Loop 0 means no loop, loop -1 means infinite loop." }, { "flag": "", "long": null, "arg": null, "description": "Allow forcing a decoder of a different media type than the one detected or designated by the demuxer. Useful for decoding media data muxed as data streams." }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "Select an encoder (when used before an output file) or a decoder (when used before an input file) for one or more streams. codec is the name of a decoder/encoder or a special value \"copy\" (output only) to indicate that the stream is not to be re-encoded. For example ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT encodes all video streams with libx264 and copies all audio streams. For each stream, the last matching \"c\" option is applied, so ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT will copy all the streams except the second video, which will be encoded with libx264, and the 138th audio, which will be encoded with libvorbis." }, { "flag": "-t", "long": null, "arg": null, "description": "When used as an input option (before \"-i\"), limit the duration of data read from the input file. When used as an output option (before an output url), stop writing the output after its duration reaches duration. duration must be a time duration specification, see the Time duration section in the ffmpeg-utils(1) manual. -to and -t are mutually exclusive and -t has priority." }, { "flag": "", "long": null, "arg": null, "description": "Stop writing the output or reading the input at position. position must be a time duration specification, see the Time duration section in the ffmpeg-utils(1) manual. -to and -t are mutually exclusive and -t has priority." }, { "flag": "", "long": null, "arg": null, "description": "Set the file size limit, expressed in bytes. No further chunk of bytes is written after the limit is exceeded. The size of the output file is slightly more than the requested file size." }, { "flag": "", "long": null, "arg": null, "description": "When used as an input option (before \"-i\"), seeks in this input file to position. Note that in most formats it is not possible to seek exactly, so ffmpeg will seek to the closest seek point before position. When transcoding and -accurateseek is enabled (the default), this extra segment between the seek point and position will be decoded and discarded. When doing stream copy or when -noaccurateseek is used, it will be preserved. When used as an output option (before an output url), decodes but discards input until the timestamps reach position. position must be a time duration specification, see the Time duration section in the ffmpeg-utils(1) manual." }, { "flag": "", "long": null, "arg": null, "description": "Like the \"-ss\" option but relative to the \"end of file\". That is negative values are earlier in the file, 0 is at EOF." }, { "flag": "", "long": null, "arg": null, "description": "Assign an input as a sync source. This will take the difference between the start times of the target and reference inputs and offset the timestamps of the target file by that difference. The source timestamps of the two inputs should derive from the same clock source for expected results. If \"copyts\" is set then \"startatzero\" must also be set. If either of the inputs has no starting timestamp then no sync adjustment is made. Acceptable values are those that refer to a valid ffmpeg input index. If the sync reference is the target index itself or -1, then no adjustment is made to target timestamps. A sync reference may not itself be synced to any other input. Default value is -1." }, { "flag": "", "long": null, "arg": null, "description": "Set the input time offset. offset must be a time duration specification, see the Time duration section in the ffmpeg-utils(1) manual. The offset is added to the timestamps of the input files. Specifying a positive offset means that the corresponding streams are delayed by the time duration specified in offset." }, { "flag": "", "long": null, "arg": null, "description": "Rescale input timestamps. scale should be a floating point number." }, { "flag": "", "long": null, "arg": null, "description": "Set the recording timestamp in the container. date must be a date specification, see the Date section in the ffmpeg-utils(1) manual." }, { "flag": "", "long": null, "arg": null, "description": "Set a metadata key/value pair. An optional metadataspecifier may be given to set metadata on streams, chapters or programs. See \"-mapmetadata\" documentation for details. This option overrides metadata set with \"-mapmetadata\". It is also possible to delete metadata by using an empty value. For example, for setting the title in the output file: ffmpeg -i in.avi -metadata title=\"my title\" out.flv To set the language of the first audio stream: ffmpeg -i INPUT -metadata:s:a:0 language=eng OUTPUT" }, { "flag": "", "long": null, "arg": null, "description": "Sets the disposition for a stream. By default, the disposition is copied from the input stream, unless the output stream this option applies to is fed by a complex filtergraph - in that case the disposition is unset by default. value is a sequence of items separated by '+' or '-'. The first item may also be prefixed with '+' or '-', in which case this option modifies the default value. Otherwise (the first item is not prefixed) this options overrides the default value. A '+' prefix adds the given disposition, '-' removes it. It is also possible to clear the disposition by setting it to 0. If no \"-disposition\" options were specified for an output file, ffmpeg will automatically set the 'default' disposition on the first stream of each type, when there are multiple streams of this type in the output file and no stream of that type is already marked as default. The \"-dispositions\" option lists the known dispositions. For example, to make the second audio stream the default stream: ffmpeg -i in.mkv -c copy -disposition:a:1 default out.mkv To make the second subtitle stream the default stream and remove the default disposition from the first subtitle stream: ffmpeg -i in.mkv -c copy -disposition:s:0 0 -disposition:s:1 default out.mkv To add an embedded cover/thumbnail: ffmpeg -i in.mp4 -i IMAGE -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attachedpic out.mp4 Not all muxers support embedded thumbnails, and those who do, only support a few formats, like JPEG or PNG." }, { "flag": "", "long": null, "arg": null, "description": "Creates a program with the specified title, programnum and adds the specified stream(s) to it." }, { "flag": "", "long": null, "arg": null, "description": "Specify target file type (\"vcd\", \"svcd\", \"dvd\", \"dv\", \"dv50\"). type may be prefixed with \"pal-\", \"ntsc-\" or \"film-\" to use the corresponding standard. All the format options (bitrate, codecs, buffer sizes) are then set automatically. You can just type: ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg Nevertheless you can specify additional options as long as you know they do not conflict with the standard, as in: ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg The parameters set for each target are as follows. VCD : -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324 -s 352x288 -r 25 -codec:v mpeg1video -g 15 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680 -ar 44100 -ac 2 -codec:a mp2 -b:a 224k : -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324 -s 352x240 -r 30000/1001 -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680 -ar 44100 -ac 2 -codec:a mp2 -b:a 224k : -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324 -s 352x240 -r 24000/1001 -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680 -ar 44100 -ac 2 -codec:a mp2 -b:a 224k SVCD : -f svcd -packetsize 2324 -s 480x576 -pixfmt yuv420p -r 25 -codec:v mpeg2video -g 15 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1 -ar 44100 -codec:a mp2 -b:a 224k : -f svcd -packetsize 2324 -s 480x480 -pixfmt yuv420p -r 30000/1001 -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1 -ar 44100 -codec:a mp2 -b:a 224k : -f svcd -packetsize 2324 -s 480x480 -pixfmt yuv420p -r 24000/1001 -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1 -ar 44100 -codec:a mp2 -b:a 224k DVD : -f dvd -muxrate 10080k -packetsize 2048 -s 720x576 -pixfmt yuv420p -r 25 -codec:v mpeg2video -g 15 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008 -ar 48000 -codec:a ac3 -b:a 448k : -f dvd -muxrate 10080k -packetsize 2048 -s 720x480 -pixfmt yuv420p -r 30000/1001 -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008 -ar 48000 -codec:a ac3 -b:a 448k : -f dvd -muxrate 10080k -packetsize 2048 -s 720x480 -pixfmt yuv420p -r 24000/1001 -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008 -ar 48000 -codec:a ac3 -b:a 448k DV : -f dv -s 720x576 -pixfmt yuv420p -r 25 -ar 48000 -ac 2 : -f dv -s 720x480 -pixfmt yuv411p -r 30000/1001 -ar 48000 -ac 2 : -f dv -s 720x480 -pixfmt yuv411p -r 24000/1001 -ar 48000 -ac 2 The \"dv50\" target is identical to the \"dv\" target except that the pixel format set is \"yuv422p\" for all three standards. Any user-set value for a parameter above will override the target preset value. In that case, the output may not comply with the target standard." }, { "flag": "", "long": null, "arg": null, "description": "As an input option, blocks all data streams of a file from being filtered or being automatically selected or mapped for any output. See \"-discard\" option to disable streams individually. As an output option, disables data recording i.e. automatic selection or mapping of any data stream. For full manual control see the \"-map\" option." }, { "flag": "", "long": null, "arg": null, "description": "Set the number of data frames to output. This is an obsolete alias for \"-frames:d\", which you should use instead." }, { "flag": "", "long": null, "arg": null, "description": "Stop writing to the stream after framecount frames." }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "Use fixed quality scale (VBR). The meaning of q/qscale is codec-dependent. If qscale is used without a streamspecifier then it applies only to the video stream, this is to maintain compatibility with previous behavior and as specifying the same codec specific value to 2 different codecs that is audio and video generally is not what is intended when no streamspecifier is used." }, { "flag": "", "long": null, "arg": null, "description": "Create the filtergraph specified by filtergraph and use it to filter the stream. filtergraph is a description of the filtergraph to apply to the stream, and must have a single input and a single output of the same type of the stream. In the filtergraph, the input is associated to the label \"in\", and the output to the label \"out\". See the ffmpeg- filters manual for more information about the filtergraph syntax. See the -filtercomplex option if you want to create filtergraphs with multiple inputs and/or outputs." }, { "flag": "", "long": null, "arg": null, "description": "This option is similar to -filter, the only difference is that its argument is the name of the file from which a filtergraph description is to be read." }, { "flag": "", "long": null, "arg": null, "description": "This boolean option determines if the filtergraph(s) to which this stream is fed gets reinitialized when input frame parameters change mid-stream. This option is enabled by default as most video and all audio filters cannot handle deviation in input frame properties. Upon reinitialization, existing filter state is lost, like e.g. the frame count \"n\" reference available in some filters. Any frames buffered at time of reinitialization are lost. The properties where a change triggers reinitialization are, for video, frame resolution or pixel format; for audio, sample format, sample rate, channel count or channel layout." }, { "flag": "", "long": null, "arg": null, "description": "Defines how many threads are used to process a filter pipeline. Each pipeline will produce a thread pool with this many threads available for parallel processing. The default is the number of available CPUs." }, { "flag": "", "long": null, "arg": null, "description": "Specify the preset for matching stream(s)." }, { "flag": "", "long": null, "arg": null, "description": "Print encoding progress/statistics. It is on by default, to explicitly disable it you need to specify \"-nostats\"." }, { "flag": "", "long": null, "arg": null, "description": "Set period at which encoding progress/statistics are updated. Default is 0.5 seconds." }, { "flag": "", "long": null, "arg": null, "description": "Send program-friendly progress information to url. Progress information is written periodically and at the end of the encoding process. It is made of \"key=value\" lines. key consists of only alphanumeric characters. The last key of a sequence of progress information is always \"progress\". The update period is set using \"-statsperiod\"." }, { "flag": "", "long": null, "arg": null, "description": "Enable interaction on standard input. On by default unless standard input is used as an input. To explicitly disable interaction you need to specify \"-nostdin\". Disabling interaction on standard input is useful, for example, if ffmpeg is in the background process group. Roughly the same result can be achieved with \"ffmpeg ... < /dev/null\" but it requires a shell." }, { "flag": "", "long": null, "arg": null, "description": "Print timestamp information. It is off by default. This option is mostly useful for testing and debugging purposes, and the output format may change from one version to another, so it should not be employed by portable scripts. See also the option \"-fdebug ts\"." }, { "flag": "", "long": null, "arg": null, "description": "Add an attachment to the output file. This is supported by a few formats like Matroska for e.g. fonts used in rendering subtitles. Attachments are implemented as a specific type of stream, so this option will add a new stream to the file. It is then possible to use per-stream options on this stream in the usual way. Attachment streams created with this option will be created after all the other streams (i.e. those created with \"-map\" or automatic mappings). Note that for Matroska you also have to set the mimetype metadata tag: ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv (assuming that the attachment stream will be third in the output file)." }, { "flag": "", "long": null, "arg": null, "description": "Extract the matching attachment stream into a file named filename. If filename is empty, then the value of the \"filename\" metadata tag will be used. E.g. to extract the first attachment to a file named 'out.ttf': ffmpeg -dumpattachment:t:0 out.ttf -i INPUT To extract all attachments to files determined by the \"filename\" tag: ffmpeg -dumpattachment:t \"\" -i INPUT Technical note -- attachments are implemented as codec extradata, so this option can actually be used to extract extradata from any stream, not just attachments." }, { "flag": "", "long": null, "arg": null, "description": "Set the number of video frames to output. This is an obsolete alias for \"-frames:v\", which you should use instead." }, { "flag": "", "long": null, "arg": null, "description": "Set frame rate (Hz value, fraction or abbreviation). As an input option, ignore any timestamps stored in the file and instead generate timestamps assuming constant frame rate fps. This is not the same as the -framerate option used for some input formats like image2 or v4l2 (it used to be the same in older versions of FFmpeg). If in doubt use -framerate instead of the input option -r. As an output option: video encoding Duplicate or drop frames right before encoding them to achieve constant output frame rate fps. video streamcopy Indicate to the muxer that fps is the stream frame rate. No data is dropped or duplicated in this case. This may produce invalid files if fps does not match the actual stream frame rate as determined by packet timestamps. See also the \"setts\" bitstream filter." }, { "flag": "", "long": null, "arg": null, "description": "Set maximum frame rate (Hz value, fraction or abbreviation). Clamps output frame rate when output framerate is auto-set and is higher than this value. Useful in batch processing or when input framerate is wrongly detected as very high. It cannot be set together with \"-r\". It is ignored during streamcopy." }, { "flag": "", "long": null, "arg": null, "description": "Set frame size. As an input option, this is a shortcut for the videosize private option, recognized by some demuxers for which the frame size is either not stored in the file or is configurable -- e.g. raw video or video grabbers. As an output option, this inserts the \"scale\" video filter to the end of the corresponding filtergraph. Please use the \"scale\" filter directly to insert it at the beginning or some other place. The format is wxh (default - same as source)." }, { "flag": "", "long": null, "arg": null, "description": "Set the video display aspect ratio specified by aspect. aspect can be a floating point number string, or a string of the form num:den, where num and den are the numerator and denominator of the aspect ratio. For example \"4:3\", \"16:9\", \"1.3333\", and \"1.7777\" are valid argument values. If used together with -vcodec copy, it will affect the aspect ratio stored at container level, but not the aspect ratio stored in encoded frames, if it exists." }, { "flag": "", "long": null, "arg": null, "description": "Set video rotation metadata. rotation is a decimal number specifying the amount in degree by which the video should be rotated counter-clockwise before being displayed. This option overrides the rotation/display transform metadata stored in the file, if any. When the video is being transcoded (rather than copied) and \"-autorotate\" is enabled, the video will be rotated at the filtering stage. Otherwise, the metadata will be written into the output file if the muxer supports it. If the \"-displayhflip\" and/or \"-displayvflip\" options are given, they are applied after the rotation specified by this option." }, { "flag": "", "long": null, "arg": null, "description": "Set whether on display the image should be horizontally flipped. See the \"-displayrotation\" option for more details." }, { "flag": "", "long": null, "arg": null, "description": "Set whether on display the image should be vertically flipped. See the \"-displayrotation\" option for more details." }, { "flag": "", "long": null, "arg": null, "description": "As an input option, blocks all video streams of a file from being filtered or being automatically selected or mapped for any output. See \"-discard\" option to disable streams individually. As an output option, disables video recording i.e. automatic selection or mapping of any video stream. For full manual control see the \"-map\" option." }, { "flag": "", "long": null, "arg": null, "description": "Set the video codec. This is an alias for \"-codec:v\"." }, { "flag": "", "long": null, "arg": null, "description": "Select the pass number (1 or 2). It is used to do two-pass video encoding. The statistics of the video are recorded in the first pass into a log file (see also the option -passlogfile), and in the second pass that log file is used to generate the video at the exact requested bitrate. On pass 1, you may just deactivate audio and set output to null, examples for Windows and Unix: ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null" }, { "flag": "", "long": null, "arg": null, "description": "Set two-pass log file name prefix to prefix, the default file name prefix is ``ffmpeg2pass''. The complete file name will be PREFIX-N.log, where N is a number specific to the output stream" }, { "flag": "", "long": null, "arg": null, "description": "Create the filtergraph specified by filtergraph and use it to filter the stream. This is an alias for \"-filter:v\", see the -filter option." }, { "flag": "", "long": null, "arg": null, "description": "Automatically rotate the video according to file metadata. Enabled by default, use -noautorotate to disable it." }, { "flag": "", "long": null, "arg": null, "description": "Automatically scale the video according to the resolution of first frame. Enabled by default, use -noautoscale to disable it. When autoscale is disabled, all output frames of filter graph might not be in the same resolution and may be inadequate for some encoder/muxer. Therefore, it is not recommended to disable it unless you really know what you are doing. Disable autoscale at your own risk." }, { "flag": "", "long": null, "arg": null, "description": "Set pixel format. Use \"-pixfmts\" to show all the supported pixel formats. If the selected pixel format can not be selected, ffmpeg will print a warning and select the best pixel format supported by the encoder. If pixfmt is prefixed by a \"+\", ffmpeg will exit with an error if the requested pixel format can not be selected, and automatic conversions inside filtergraphs are disabled. If pixfmt is a single \"+\", ffmpeg selects the same pixel format as the input (or graph output) and automatic conversions are disabled." }, { "flag": "", "long": null, "arg": null, "description": "Set default flags for the libswscale library. These flags are used by automatically inserted \"scale\" filters and those within simple filtergraphs, if not overridden within the filtergraph definition. See the ffmpeg-scaler manual for a list of scaler options." }, { "flag": "", "long": null, "arg": null, "description": "Rate control override for specific intervals, formatted as \"int,int,int\" list separated with slashes. Two first values are the beginning and end frame numbers, last one is quantizer to use if positive, or quality factor if negative." }, { "flag": "", "long": null, "arg": null, "description": "Calculate PSNR of compressed frames. This option is deprecated, pass the PSNR flag to the encoder instead, using \"-flags +psnr\"." }, { "flag": "", "long": null, "arg": null, "description": "Dump video coding statistics to vstatsHHMMSS.log. See the vstats file format section for the format description." }, { "flag": "", "long": null, "arg": null, "description": "Dump video coding statistics to file. See the vstats file format section for the format description." }, { "flag": "", "long": null, "arg": null, "description": "Specify which version of the vstats format to use. Default is 2. See the vstats file format section for the format description." }, { "flag": "", "long": null, "arg": null, "description": "Force video tag/fourcc. This is an alias for \"-tag:v\"." }, { "flag": "", "long": null, "arg": null, "description": "Deprecated see -bsf" }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "forcekeyframes can take arguments of the following form: time[,time...] If the argument consists of timestamps, ffmpeg will round the specified times to the nearest output timestamp as per the encoder time base and force a keyframe at the first frame having timestamp equal or greater than the computed timestamp. Note that if the encoder time base is too coarse, then the keyframes may be forced on frames with timestamps lower than the specified time. The default encoder time base is the inverse of the output framerate but may be set otherwise via \"-enctimebase\". If one of the times is \"\"chapters\"[delta]\", it is expanded into the time of the beginning of all chapters in the file, shifted by delta, expressed as a time in seconds. This option can be useful to ensure that a seek point is present at a chapter mark or any other designated place in the output file. For example, to insert a key frame at 5 minutes, plus key frames 0.1 second before the beginning of every chapter: -forcekeyframes 0:05:00,chapters-0.1 expr:expr If the argument is prefixed with \"expr:\", the string expr is interpreted like an expression and is evaluated for each frame. A key frame is forced in case the evaluation is non-zero. The expression in expr can contain the following constants: n the number of current processed frame, starting from 0 nforced the number of forced frames prevforcedn the number of the previous forced frame, it is \"NAN\" when no keyframe was forced yet prevforcedt the time of the previous forced frame, it is \"NAN\" when no keyframe was forced yet t the time of the current processed frame For example to force a key frame every 5 seconds, you can specify: -forcekeyframes expr:gte(t,nforced*5) To force a key frame 5 seconds after the time of the last forced one, starting from second 13: -forcekeyframes expr:if(isnan(prevforcedt),gte(t,13),gte(t,prevforcedt+5)) source If the argument is \"source\", ffmpeg will force a key frame if the current frame being encoded is marked as a key frame in its source. In cases where this particular source frame has to be dropped, enforce the next available frame to become a key frame instead. Note that forcing too many keyframes is very harmful for the lookahead algorithms of certain encoders: using fixed-GOP options or similar would be more efficient." }, { "flag": "", "long": null, "arg": null, "description": "When doing stream copy, copy also non-key frames found at the beginning." }, { "flag": "", "long": null, "arg": null, "description": "Initialise a new hardware device of type type called name, using the given device parameters. If no name is specified it will receive a default name of the form \"type%d\". The meaning of device and the following arguments depends on the device type: cuda device is the number of the CUDA device. The following options are recognized: primaryctx If set to 1, uses the primary device context instead of creating a new one. Examples: -inithwdevice cuda:1 Choose the second device on the system. -inithwdevice cuda:0,primaryctx=1 Choose the first device and use the primary device context. dxva2 device is the number of the Direct3D 9 display adapter. d3d11va device is the number of the Direct3D 11 display adapter. vaapi device is either an X11 display name, a DRM render node or a DirectX adapter index. If not specified, it will attempt to open the default X11 display ($DISPLAY) and then the first DRM render node (/dev/dri/renderD128), or the default DirectX adapter on Windows. vdpau device is an X11 display name. If not specified, it will attempt to open the default X11 display ($DISPLAY). qsv device selects a value in MFXIMPL*. Allowed values are: auto sw hw autoany hwany hw2 hw3 hw4 If not specified, autoany is used. (Note that it may be easier to achieve the desired result for QSV by creating the platform-appropriate subdevice (dxva2 or d3d11va or vaapi) and then deriving a QSV device from that.) Alternatively, childdevicetype helps to choose platform-appropriate subdevice type. On Windows d3d11va is used as default subdevice type. Examples: -inithwdevice qsv:hw,childdevicetype=d3d11va Choose the GPU subdevice with type d3d11va and create QSV device with MFXIMPLHARDWARE. -inithwdevice qsv:hw,childdevicetype=dxva2 Choose the GPU subdevice with type dxva2 and create QSV device with MFXIMPLHARDWARE. opencl device selects the platform and device as platformindex.deviceindex. The set of devices can also be filtered using the key-value pairs to find only devices matching particular platform or device strings. The strings usable as filters are: platformprofile platformversion platformname platformvendor platformextensions devicename devicevendor driverversion deviceversion deviceprofile deviceextensions devicetype The indices and filters must together uniquely select a device. Examples: -inithwdevice opencl:0.1 Choose the second device on the first platform. -inithwdevice opencl:,devicename=Foo9000 Choose the device with a name containing the string Foo9000. -inithwdevice opencl:1,devicetype=gpu,deviceextensions=clkhrfp16 Choose the GPU device on the second platform supporting the clkhrfp16 extension. vulkan If device is an integer, it selects the device by its index in a system-dependent list of devices. If device is any other string, it selects the first device with a name containing that string as a substring. The following options are recognized: debug If set to 1, enables the validation layer, if installed. linearimages If set to 1, images allocated by the hwcontext will be linear and locally mappable. instanceextensions A plus separated list of additional instance extensions to enable. deviceextensions A plus separated list of additional device extensions to enable. Examples: -inithwdevice vulkan:1 Choose the second device on the system. -inithwdevice vulkan:RADV Choose the first device with a name containing the string RADV. -inithwdevice vulkan:0,instanceextensions=VKKHRwaylandsurface+VKKHRxcbsurface Choose the first device and enable the Wayland and XCB instance extensions." }, { "flag": "", "long": null, "arg": null, "description": "Initialise a new hardware device of type type called name, deriving it from the existing device with the name source." }, { "flag": "", "long": null, "arg": null, "description": "List all hardware device types supported in this build of ffmpeg." }, { "flag": "", "long": null, "arg": null, "description": "Pass the hardware device called name to all filters in any filter graph. This can be used to set the device to upload to with the \"hwupload\" filter, or the device to map to with the \"hwmap\" filter. Other filters may also make use of this parameter when they require a hardware device. Note that this is typically only required when the input is not already in hardware frames - when it is, filters will derive the device they require from the context of the frames they receive as input. This is a global setting, so all filters will receive the same device." }, { "flag": "", "long": null, "arg": null, "description": "Use hardware acceleration to decode the matching stream(s). The allowed values of hwaccel are: none Do not use any hardware acceleration (the default). auto Automatically select the hardware acceleration method. vdpau Use VDPAU (Video Decode and Presentation API for Unix) hardware acceleration. dxva2 Use DXVA2 (DirectX Video Acceleration) hardware acceleration. d3d11va Use D3D11VA (DirectX Video Acceleration) hardware acceleration. vaapi Use VAAPI (Video Acceleration API) hardware acceleration. qsv Use the Intel QuickSync Video acceleration for video transcoding. Unlike most other values, this option does not enable accelerated decoding (that is used automatically whenever a qsv decoder is selected), but accelerated transcoding, without copying the frames into the system memory. For it to work, both the decoder and the encoder must support QSV acceleration and no filters must be used. This option has no effect if the selected hwaccel is not available or not supported by the chosen decoder. Note that most acceleration methods are intended for playback and will not be faster than software decoding on modern CPUs. Additionally, ffmpeg will usually need to copy the decoded frames from the GPU memory into the system memory, resulting in further performance loss. This option is thus mainly useful for testing." }, { "flag": "", "long": null, "arg": null, "description": "Select a device to use for hardware acceleration. This option only makes sense when the -hwaccel option is also specified. It can either refer to an existing device created with -inithwdevice by name, or it can create a new device as if -inithwdevice type:hwacceldevice were called immediately before." }, { "flag": "", "long": null, "arg": null, "description": "List all hardware acceleration components enabled in this build of ffmpeg. Actual runtime availability depends on the hardware and its suitable driver being installed." }, { "flag": "", "long": null, "arg": null, "description": "Set a specific output video stream as the heartbeat stream according to which to split and push through currently in-progress subtitle upon receipt of a random access packet. This lowers the latency of subtitles for which the end packet or the following subtitle has not yet been received. As a drawback, this will most likely lead to duplication of subtitle events in order to cover the full duration, so when dealing with use cases where latency of when the subtitle event is passed on to output is not relevant this option should not be utilized. Requires -fixsubduration to be set for the relevant input subtitle stream for this to have any effect, as well as for the input subtitle stream having to be directly mapped to the same output in which the heartbeat stream resides." }, { "flag": "", "long": null, "arg": null, "description": "Set the number of audio frames to output. This is an obsolete alias for \"-frames:a\", which you should use instead." }, { "flag": "", "long": null, "arg": null, "description": "Set the audio sampling frequency. For output streams it is set by default to the frequency of the corresponding input stream. For input streams this option only makes sense for audio grabbing devices and raw demuxers and is mapped to the corresponding demuxer options." }, { "flag": "", "long": null, "arg": null, "description": "Set the audio quality (codec-specific, VBR). This is an alias for -q:a." }, { "flag": "", "long": null, "arg": null, "description": "Set the number of audio channels. For output streams it is set by default to the number of input audio channels. For input streams this option only makes sense for audio grabbing devices and raw demuxers and is mapped to the corresponding demuxer options." }, { "flag": "", "long": null, "arg": null, "description": "As an input option, blocks all audio streams of a file from being filtered or being automatically selected or mapped for any output. See \"-discard\" option to disable streams individually. As an output option, disables audio recording i.e. automatic selection or mapping of any audio stream. For full manual control see the \"-map\" option." }, { "flag": "", "long": null, "arg": null, "description": "Set the audio codec. This is an alias for \"-codec:a\"." }, { "flag": "", "long": null, "arg": null, "description": "Set the audio sample format. Use \"-samplefmts\" to get a list of supported sample formats." }, { "flag": "", "long": null, "arg": null, "description": "Create the filtergraph specified by filtergraph and use it to filter the stream. This is an alias for \"-filter:a\", see the -filter option." }, { "flag": "", "long": null, "arg": null, "description": "Force audio tag/fourcc. This is an alias for \"-tag:a\"." }, { "flag": "", "long": null, "arg": null, "description": "Deprecated, see -bsf" }, { "flag": "", "long": null, "arg": null, "description": "If some input channel layout is not known, try to guess only if it corresponds to at most the specified number of channels. For example, 2 tells to ffmpeg to recognize 1 channel as mono and 2 channels as stereo but not 6 channels as 5.1. The default is to always try to guess. Use 0 to disable all guessing." }, { "flag": "", "long": null, "arg": null, "description": "Set the subtitle codec. This is an alias for \"-codec:s\"." }, { "flag": "", "long": null, "arg": null, "description": "As an input option, blocks all subtitle streams of a file from being filtered or being automatically selected or mapped for any output. See \"-discard\" option to disable streams individually. As an output option, disables subtitle recording i.e. automatic selection or mapping of any subtitle stream. For full manual control see the \"-map\" option." }, { "flag": "", "long": null, "arg": null, "description": "Deprecated, see -bsf" }, { "flag": "", "long": null, "arg": null, "description": "Fix subtitles durations. For each subtitle, wait for the next packet in the same stream and adjust the duration of the first to avoid overlap. This is necessary with some subtitles codecs, especially DVB subtitles, because the duration in the original packet is only a rough estimate and the end is actually marked by an empty subtitle frame. Failing to use this option when necessary can result in exaggerated durations or muxing failures due to non-monotonic timestamps. Note that this option will delay the output of all data until the next subtitle packet is decoded: it may increase memory consumption and latency a lot." }, { "flag": "", "long": null, "arg": null, "description": "Set the size of the canvas used to render subtitles." }, { "flag": "", "long": null, "arg": null, "description": "Create one or more streams in the output file. This option has two forms for specifying the data source(s): the first selects one or more streams from some input file (specified with \"-i\"), the second takes an output from some complex filtergraph (specified with \"-filtercomplex\" or \"-filtercomplexscript\"). In the first form, an output stream is created for every stream from the input file with the index inputfileid. If streamspecifier is given, only those streams that match the specifier are used (see the Stream specifiers section for the streamspecifier syntax). A \"-\" character before the stream identifier creates a \"negative\" mapping. It disables matching streams from already created mappings. A trailing \"?\" after the stream index will allow the map to be optional: if the map matches no streams the map will be ignored instead of failing. Note the map will still fail if an invalid input file index is used; such as if the map refers to a non-existent input. An alternative [linklabel] form will map outputs from complex filter graphs (see the -filtercomplex option) to the output file. linklabel must correspond to a defined output link label in the graph. This option may be specified multiple times, each adding more streams to the output file. Any given input stream may also be mapped any number of times as a source for different output streams, e.g. in order to use different encoding options and/or filters. The streams are created in the output in the same order in which the \"-map\" options are given on the commandline. Using this option disables the default mappings for this output file. Examples: map everything To map ALL streams from the first input file to output ffmpeg -i INPUT -map 0 output select specific stream If you have two audio streams in the first input file, these streams are identified by 0:0 and 0:1. You can use \"-map\" to select which streams to place in an output file. For example: ffmpeg -i INPUT -map 0:1 out.wav will map the second input stream in INPUT to the (single) output stream in out.wav. create multiple streams To select the stream with index 2 from input file a.mov (specified by the identifier 0:2), and stream with index 6 from input b.mov (specified by the identifier 1:6), and copy them to the output file out.mov: ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov create multiple streams 2 To select all video and the third audio stream from an input file: ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT negative map To map all the streams except the second audio, use negative mappings ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT optional map To map the video and audio streams from the first input, and using the trailing \"?\", ignore the audio mapping if no audio streams exist in the first input: ffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT map by language To pick the English audio stream: ffmpeg -i INPUT -map 0:m:language:eng OUTPUT" }, { "flag": "", "long": null, "arg": null, "description": "Ignore input streams with unknown type instead of failing if copying such streams is attempted." }, { "flag": "", "long": null, "arg": null, "description": "Allow input streams with unknown type to be copied instead of failing if copying such streams is attempted." }, { "flag": "", "long": null, "arg": null, "description": "[inputfileid.streamspecifier.channelid|-1][?][:outputfileid.streamspecifier] This option is deprecated and will be removed. It can be replaced by the pan filter. In some cases it may be easier to use some combination of the channelsplit, channelmap, or amerge filters. Map an audio channel from a given input to an output. If outputfileid.streamspecifier is not set, the audio channel will be mapped on all the audio streams. Using \"-1\" instead of inputfileid.streamspecifier.channelid will map a muted channel. A trailing \"?\" will allow the mapchannel to be optional: if the mapchannel matches no channel the mapchannel will be ignored instead of failing. For example, assuming INPUT is a stereo audio file, you can switch the two audio channels with the following command: ffmpeg -i INPUT -mapchannel 0.0.1 -mapchannel 0.0.0 OUTPUT If you want to mute the first channel and keep the second: ffmpeg -i INPUT -mapchannel -1 -mapchannel 0.0.1 OUTPUT The order of the \"-mapchannel\" option specifies the order of the channels in the output stream. The output channel layout is guessed from the number of channels mapped (mono if one \"-mapchannel\", stereo if two, etc.). Using \"-ac\" in combination of \"-mapchannel\" makes the channel gain levels to be updated if input and output channel layouts don't match (for instance two \"-mapchannel\" options and \"-ac 6\"). You can also extract each channel of an input to specific outputs; the following command extracts two channels of the INPUT audio stream (file 0, stream 0) to the respective OUTPUTCH0 and OUTPUTCH1 outputs: ffmpeg -i INPUT -mapchannel 0.0.0 OUTPUTCH0 -mapchannel 0.0.1 OUTPUTCH1 The following example splits the channels of a stereo input into two separate streams, which are put into the same output file: ffmpeg -i stereo.wav -map 0:0 -map 0:0 -mapchannel 0.0.0:0.0 -mapchannel 0.0.1:0.1 -y out.ogg Note that currently each output stream can only contain channels from a single input stream; you can't for example use \"-mapchannel\" to pick multiple input audio channels contained in different streams (from the same or different files) and merge them into a single output stream. It is therefore not currently possible, for example, to turn two separate mono streams into a single stereo stream. However splitting a stereo stream into two single channel mono streams is possible. If you need this feature, a possible workaround is to use the amerge filter. For example, if you need to merge a media (here input.mkv) with 2 mono audio streams into one single stereo channel audio stream (and keep the video stream), you can use the following command: ffmpeg -i input.mkv -filtercomplex \"[0:1] [0:2] amerge\" -c:a pcms16le -c:v copy output.mkv To map the first two audio channels from the first input, and using the trailing \"?\", ignore the audio channel mapping if the first input is mono instead of stereo: ffmpeg -i INPUT -mapchannel 0.0.0 -mapchannel 0.0.1? OUTPUT" }, { "flag": "", "long": null, "arg": null, "description": "Set metadata information of the next output file from infile. Note that those are file indices (zero-based), not filenames. Optional metadataspecin/out parameters specify, which metadata to copy. A metadata specifier can have the following forms: g global metadata, i.e. metadata that applies to the whole file s[:streamspec] per-stream metadata. streamspec is a stream specifier as described in the Stream specifiers chapter. In an input metadata specifier, the first matching stream is copied from. In an output metadata specifier, all matching streams are copied to. c:chapterindex per-chapter metadata. chapterindex is the zero-based chapter index. p:programindex per-program metadata. programindex is the zero-based program index. If metadata specifier is omitted, it defaults to global. By default, global metadata is copied from the first input file, per-stream and per- chapter metadata is copied along with streams/chapters. These default mappings are disabled by creating any mapping of the relevant type. A negative file index can be used to create a dummy mapping that just disables automatic copying. For example to copy metadata from the first stream of the input file to global metadata of the output file: ffmpeg -i in.ogg -mapmetadata 0:s:0 out.mp3 To do the reverse, i.e. copy global metadata to all audio streams: ffmpeg -i in.mkv -mapmetadata:s:a 0:g out.mkv Note that simple 0 would work as well in this example, since global metadata is assumed by default." }, { "flag": "", "long": null, "arg": null, "description": "Copy chapters from input file with index inputfileindex to the next output file. If no chapter mapping is specified, then chapters are copied from the first input file with at least one chapter. Use a negative file index to disable any chapter copying." }, { "flag": "", "long": null, "arg": null, "description": "Show benchmarking information at the end of an encode. Shows real, system and user time used and maximum memory consumption. Maximum memory consumption is not supported on all systems, it will usually display as 0 if not supported." }, { "flag": "", "long": null, "arg": null, "description": "Show benchmarking information during the encode. Shows real, system and user time used in various steps (audio/video encode/decode)." }, { "flag": "", "long": null, "arg": null, "description": "Exit after ffmpeg has been running for duration seconds in CPU user time." }, { "flag": "", "long": null, "arg": null, "description": "Dump each input packet to stderr." }, { "flag": "", "long": null, "arg": null, "description": "When dumping packets, also dump the payload." }, { "flag": "", "long": null, "arg": null, "description": "Limit input read speed. Its value is a floating-point positive number which represents the maximum duration of media, in seconds, that should be ingested in one second of wallclock time. Default value is zero and represents no imposed limitation on speed of ingestion. Value 1 represents real-time speed and is equivalent to \"-re\". Mainly used to simulate a capture device or live input stream (e.g. when reading from a file). Should not be used with a low value when input is an actual capture device or live stream as it may cause packet loss. It is useful for when flow speed of output packets is important, such as live streaming." }, { "flag": "", "long": null, "arg": null, "description": "Read input at native frame rate. This is equivalent to setting \"-readrate 1\"." }, { "flag": "", "long": null, "arg": null, "description": "Set an initial read burst time, in seconds, after which -re/-readrate will be enforced." }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "Set video sync method / framerate mode. vsync is applied to all output video streams but can be overridden for a stream by setting fpsmode. vsync is deprecated and will be removed in the future. For compatibility reasons some of the values for vsync can be specified as numbers (shown in parentheses in the following table). passthrough (0) Each frame is passed with its timestamp from the demuxer to the muxer. cfr (1) Frames will be duplicated and dropped to achieve exactly the requested constant frame rate. vfr (2) Frames are passed through with their timestamp or dropped so as to prevent 2 frames from having the same timestamp. drop As passthrough but destroys all timestamps, making the muxer generate fresh timestamps based on frame-rate. auto (-1) Chooses between cfr and vfr depending on muxer capabilities. This is the default method. Note that the timestamps may be further modified by the muxer, after this. For example, in the case that the format option avoidnegativets is enabled. With -map you can select from which stream the timestamps should be taken. You can leave either video or audio unchanged and sync the remaining stream(s) to the unchanged one." }, { "flag": "", "long": null, "arg": null, "description": "Frame drop threshold, which specifies how much behind video frames can be before they are dropped. In frame rate units, so 1.0 is one frame. The default is -1.1. One possible usecase is to avoid framedrops in case of noisy timestamps or to increase frame drop precision in case of exact timestamps." }, { "flag": "", "long": null, "arg": null, "description": "Pad the output audio stream(s). This is the same as applying \"-af apad\". Argument is a string of filter parameters composed the same as with the \"apad\" filter. \"-shortest\" must be set for this output for the option to take effect." }, { "flag": "", "long": null, "arg": null, "description": "Do not process input timestamps, but keep their values without trying to sanitize them. In particular, do not remove the initial start time offset value. Note that, depending on the vsync option or on specific muxer processing (e.g. in case the format option avoidnegativets is enabled) the output timestamps may mismatch with the input timestamps even when this option is selected." }, { "flag": "", "long": null, "arg": null, "description": "When used with copyts, shift input timestamps so they start at zero. This means that using e.g. \"-ss 50\" will make output timestamps start at 50 seconds, regardless of what timestamp the input file started at." }, { "flag": "", "long": null, "arg": null, "description": "Specify how to set the encoder timebase when stream copying. mode is an integer numeric value, and can assume one of the following values: 1 Use the demuxer timebase. The time base is copied to the output encoder from the corresponding input demuxer. This is sometimes required to avoid non monotonically increasing timestamps when copying video streams with variable frame rate. 0 Use the decoder timebase. The time base is copied to the output encoder from the corresponding input decoder. -1 Try to make the choice automatically, in order to generate a sane output. Default value is -1." }, { "flag": "", "long": null, "arg": null, "description": "Set the encoder timebase. timebase can assume one of the following values: 0 Assign a default value according to the media type. For video - use 1/framerate, for audio - use 1/samplerate. demux Use the timebase from the demuxer. filter Use the timebase from the filtergraph. a positive number Use the provided number as the timebase. This field can be provided as a ratio of two integers (e.g. 1:24, 1:48000) or as a decimal number (e.g. 0.04166, 2.0833e-5) Default value is 0." }, { "flag": "", "long": null, "arg": null, "description": "Enable bitexact mode for (de)muxer and (de/en)coder" }, { "flag": "", "long": null, "arg": null, "description": "Finish encoding when the shortest output stream ends. Note that this option may require buffering frames, which introduces extra latency. The maximum amount of this latency may be controlled with the \"-shortestbufduration\" option." }, { "flag": "", "long": null, "arg": null, "description": "The \"-shortest\" option may require buffering potentially large amounts of data when at least one of the streams is \"sparse\" (i.e. has large gaps between frames – this is typically the case for subtitles). This option controls the maximum duration of buffered frames in seconds. Larger values may allow the \"-shortest\" option to produce more accurate results, but increase memory use and latency. The default value is 10 seconds." }, { "flag": "", "long": null, "arg": null, "description": "Timestamp discontinuity delta threshold, expressed as a decimal number of seconds. The timestamp discontinuity correction enabled by this option is only applied to input formats accepting timestamp discontinuity (for which the \"AVFMTDISCONT\" flag is enabled), e.g. MPEG-TS and HLS, and is automatically disabled when employing the \"-copyts\" option (unless wrapping is detected). If a timestamp discontinuity is detected whose absolute value is greater than threshold, ffmpeg will remove the discontinuity by decreasing/increasing the current DTS and PTS by the corresponding delta value. The default value is 10." }, { "flag": "", "long": null, "arg": null, "description": "Timestamp error delta threshold, expressed as a decimal number of seconds. The timestamp correction enabled by this option is only applied to input formats not accepting timestamp discontinuity (for which the \"AVFMTDISCONT\" flag is not enabled). If a timestamp discontinuity is detected whose absolute value is greater than threshold, ffmpeg will drop the PTS/DTS timestamp value. The default value is \"3600*30\" (30 hours), which is arbitrarily picked and quite conservative." }, { "flag": "", "long": null, "arg": null, "description": "Set the maximum demux-decode delay." }, { "flag": "", "long": null, "arg": null, "description": "Set the initial demux-decode delay." }, { "flag": "", "long": null, "arg": null, "description": "Assign a new stream-id value to an output stream. This option should be specified prior to the output filename to which it applies. For the situation where multiple output files exist, a streamid may be reassigned to a different value. For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for an output mpegts file: ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts" }, { "flag": "", "long": null, "arg": null, "description": "Set bitstream filters for matching streams. bitstreamfilters is a comma-separated list of bitstream filters. Use the \"-bsfs\" option to get the list of bitstream filters. ffmpeg -i h264.mp4 -c:v copy -bsf:v h264mp4toannexb -an out.h264 ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt" }, { "flag": "", "long": null, "arg": null, "description": "Force a tag/fourcc for matching streams." }, { "flag": "", "long": null, "arg": null, "description": "Specify Timecode for writing. SEP is ':' for non drop timecode and ';' (or '.') for drop. ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg" }, { "flag": "", "long": null, "arg": null, "description": "Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or outputs. For simple graphs -- those with one input and one output of the same type -- see the -filter options. filtergraph is a description of the filtergraph, as described in the ``Filtergraph syntax'' section of the ffmpeg-filters manual. Input link labels must refer to input streams using the \"[fileindex:streamspecifier]\" syntax (i.e. the same as -map uses). If streamspecifier matches multiple streams, the first one will be used. An unlabeled input will be connected to the first unused input stream of the matching type. Output link labels are referred to with -map. Unlabeled outputs are added to the first output file. Note that with this option it is possible to use only lavfi sources without normal input files. For example, to overlay an image over video ffmpeg -i video.mkv -i image.png -filtercomplex '[0:v][1:v]overlay[out]' -map '[out]' out.mkv Here \"[0:v]\" refers to the first video stream in the first input file, which is linked to the first (main) input of the overlay filter. Similarly the first video stream in the second input is linked to the second (overlay) input of overlay. Assuming there is only one video stream in each input file, we can omit input labels, so the above is equivalent to ffmpeg -i video.mkv -i image.png -filtercomplex 'overlay[out]' -map '[out]' out.mkv Furthermore we can omit the output label and the single output from the filter graph will be added to the output file automatically, so we can simply write ffmpeg -i video.mkv -i image.png -filtercomplex 'overlay' out.mkv As a special exception, you can use a bitmap subtitle stream as input: it will be converted into a video with the same size as the largest video in the file, or 720x576 if no video is present. Note that this is an experimental and temporary solution. It will be removed once libavfilter has proper support for subtitles. For example, to hardcode subtitles on top of a DVB-T recording stored in MPEG-TS format, delaying the subtitles by 1 second: ffmpeg -i input.ts -filtercomplex \\ '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \\ -sn -map '#0x2dc' output.mkv (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video, audio and subtitles streams; 0:0, 0:3 and 0:7 would have worked too) To generate 5 seconds of pure red video using lavfi \"color\" source: ffmpeg -filtercomplex 'color=c=red' -t 5 out.mkv" }, { "flag": "", "long": null, "arg": null, "description": "Defines how many threads are used to process a filtercomplex graph. Similar to filterthreads but used for \"-filtercomplex\" graphs only. The default is the number of available CPUs." }, { "flag": "", "long": null, "arg": null, "description": "Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or outputs. Equivalent to -filtercomplex." }, { "flag": "", "long": null, "arg": null, "description": "This option is similar to -filtercomplex, the only difference is that its argument is the name of the file from which a complex filtergraph description is to be read." }, { "flag": "", "long": null, "arg": null, "description": "This option enables or disables accurate seeking in input files with the -ss option. It is enabled by default, so seeking is accurate when transcoding. Use -noaccurateseek to disable it, which may be useful e.g. when copying some streams and transcoding the others." }, { "flag": "", "long": null, "arg": null, "description": "This option enables or disables seeking by timestamp in input files with the -ss option. It is disabled by default. If enabled, the argument to the -ss option is considered an actual timestamp, and is not offset by the start time of the file. This matters only for files which do not start from timestamp 0, such as transport streams." }, { "flag": "", "long": null, "arg": null, "description": "For input, this option sets the maximum number of queued packets when reading from the file or device. With low latency / high rate live streams, packets may be discarded if they are not read in a timely manner; setting this value can force ffmpeg to use a separate input thread and read packets as soon as they arrive. By default ffmpeg only does this if multiple inputs are specified. For output, this option specified the maximum number of packets that may be queued to each muxing thread." }, { "flag": "", "long": null, "arg": null, "description": "Print sdp information for an output stream to file. This allows dumping sdp information when at least one output isn't an rtp stream. (Requires at least one of the output formats to be rtp)." }, { "flag": "", "long": null, "arg": null, "description": "Allows discarding specific streams or frames from streams. Any input stream can be fully discarded, using value \"all\" whereas selective discarding of frames from a stream occurs at the demuxer and is not supported by all demuxers. none Discard no frame. default Default, which discards no frames. noref Discard all non-reference frames. bidir Discard all bidirectional frames. nokey Discard all frames excepts keyframes. all Discard all frames." }, { "flag": "", "long": null, "arg": null, "description": "Stop and abort on various conditions. The following flags are available: emptyoutput No packets were passed to the muxer, the output is empty. emptyoutputstream No packets were passed to the muxer in some of the output streams." }, { "flag": "", "long": null, "arg": null, "description": "Set fraction of decoding frame failures across all inputs which when crossed ffmpeg will return exit code 69. Crossing this threshold does not terminate processing. Range is a floating-point number between 0 to 1. Default is 2/3." }, { "flag": "", "long": null, "arg": null, "description": "Stop and exit on error" }, { "flag": "", "long": null, "arg": null, "description": "When transcoding audio and/or video streams, ffmpeg will not begin writing into the output until it has one packet for each such stream. While waiting for that to happen, packets for other streams are buffered. This option sets the size of this buffer, in packets, for the matching output stream. The default value of this option should be high enough for most uses, so only touch this option if you are sure that you need it." }, { "flag": "", "long": null, "arg": null, "description": "This is a minimum threshold until which the muxing queue size is not taken into account. Defaults to 50 megabytes per stream, and is based on the overall size of packets passed to the muxer." }, { "flag": "", "long": null, "arg": null, "description": "Enable automatically inserting format conversion filters in all filter graphs, including those defined by -vf, -af, -filtercomplex and -lavfi. If filter format negotiation requires a conversion, the initialization of the filters will fail. Conversions can still be performed by inserting the relevant conversion filter (scale, aresample) in the graph. On by default, to explicitly disable it you need to specify \"-noautoconversionfilters\"." }, { "flag": "", "long": null, "arg": null, "description": "Declare the number of bits per raw sample in the given output stream to be value. Note that this option sets the information provided to the encoder/muxer, it does not change the stream to conform to this value. Setting values that do not match the stream properties may result in encoding failures or invalid output files." }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "Write per-frame encoding information about the matching streams into the file given by path. -statsencpre writes information about raw video or audio frames right before they are sent for encoding, while -statsencpost writes information about encoded packets as they are received from the encoder. -statsmuxpre writes information about packets just as they are about to be sent to the muxer. Every frame or packet produces one line in the specified file. The format of this line is controlled by -statsencprefmt / -statsencpostfmt / -statsmuxprefmt. When stats for multiple streams are written into a single file, the lines corresponding to different streams will be interleaved. The precise order of this interleaving is not specified and not guaranteed to remain stable between different invocations of the program, even with the same options." }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "" }, { "flag": "", "long": null, "arg": null, "description": "Specify the format for the lines written with -statsencpre / -statsencpost / -statsmuxpre. formatspec is a string that may contain directives of the form {fmt}. formatspec is backslash-escaped --- use \\{, \\}, and \\\\ to write a literal {, }, or \\, respectively, into the output. The directives given with fmt may be one of the following: fidx Index of the output file. sidx Index of the output stream in the file. n Frame number. Pre-encoding: number of frames sent to the encoder so far. Post- encoding: number of packets received from the encoder so far. Muxing: number of packets submitted to the muxer for this stream so far. ni Input frame number. Index of the input frame (i.e. output by a decoder) that corresponds to this output frame or packet. -1 if unavailable. tb Timebase in which this frame/packet's timestamps are expressed, as a rational number num/den. Note that encoder and muxer may use different timebases. tbi Timebase for ptsi, as a rational number num/den. Available when ptsi is available, 0/1 otherwise. pts Presentation timestamp of the frame or packet, as an integer. Should be multiplied by the timebase to compute presentation time. ptsi Presentation timestamp of the input frame (see ni), as an integer. Should be multiplied by tbi to compute presentation time. Printed as (2^63 - 1 = 9223372036854775807) when not available. t Presentation time of the frame or packet, as a decimal number. Equal to pts multiplied by tb. ti Presentation time of the input frame (see ni), as a decimal number. Equal to ptsi multiplied by tbi. Printed as inf when not available. dts (packet) Decoding timestamp of the packet, as an integer. Should be multiplied by the timebase to compute presentation time. dt (packet) Decoding time of the frame or packet, as a decimal number. Equal to dts multiplied by tb. sn (frame,audio) Number of audio samples sent to the encoder so far. samp (frame,audio) Number of audio samples in the frame. size (packet) Size of the encoded packet in bytes. br (packet) Current bitrate in bits per second. Post-encoding only. abr (packet) Average bitrate for the whole stream so far, in bits per second, -1 if it cannot be determined at this point. Post-encoding only. Directives tagged with packet may only be used with -statsencpostfmt and -statsmuxprefmt. Directives tagged with frame may only be used with -statsencprefmt. Directives tagged with audio may only be used with audio streams. The default format strings are: pre-encoding {fidx} {sidx} {n} {t} post-encoding {fidx} {sidx} {n} {t} In the future, new items may be added to the end of the default formatting strings. Users who depend on the format staying exactly the same, should prescribe it manually. Note that stats for different streams written into the same file may have different formats." } ], "examples": [ "If you specify the input format and device then ffmpeg can grab video and audio directly.", "ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg", "Or with an ALSA audio source (mono input, card id 1) instead of OSS:", "ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg", "Note that you must activate the right video source and channel before launching ffmpeg with", "any TV viewer such as by Gerd Knorr. You also have to set", "the audio recording levels correctly with a standard mixer.", "Grab the X11 display with ffmpeg via", "ffmpeg -f x11grab -videosize cif -framerate 25 -i :0.0 /tmp/out.mpg", "0.0 is display.screen number of your X11 server, same as the DISPLAY environment variable.", "ffmpeg -f x11grab -videosize cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg", "0.0 is display.screen number of your X11 server, same as the DISPLAY environment variable. 10", "is the x-offset and 20 the y-offset for the grabbing.", "Any supported file format and protocol can serve as input to ffmpeg:", "Examples:", "• You can use YUV files as input:", "ffmpeg -i /tmp/test%d.Y /tmp/out.mpg", "It will use the files:", "/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,", "/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...", "The Y files use twice the resolution of the U and V files. They are raw files, without", "header. They can be generated by all decent video decoders. You must specify the size of", "the image with the -s option if ffmpeg cannot guess it.", "• You can input from a raw YUV420P file:", "ffmpeg -i /tmp/test.yuv /tmp/out.avi", "test.yuv is a file containing raw YUV planar data. Each frame is composed of the Y plane", "followed by the U and V planes at half vertical and horizontal resolution.", "• You can output to a raw YUV420P file:", "ffmpeg -i mydivx.avi hugefile.yuv", "• You can set several input files and output files:", "ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg", "Converts the audio file a.wav and the raw YUV video file a.yuv to MPEG file a.mpg.", "• You can also do audio and video conversions at the same time:", "ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2", "Converts a.wav to MPEG audio at 22050 Hz sample rate.", "• You can encode to several formats at the same time and define a mapping from input stream", "to output streams:", "ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2", "Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map file:index'", "specifies which input stream is used for each output stream, in the order of the", "definition of output streams.", "• You can transcode decrypted VOBs:", "ffmpeg -i snatch1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi", "This is a typical DVD ripping example; the input is a VOB file, the output an AVI file", "with MPEG-4 video and MP3 audio. Note that in this command we use B-frames so the MPEG-4", "stream is DivX5 compatible, and GOP size is 300 which means one intra frame every 10", "seconds for 29.97fps input video. Furthermore, the audio stream is MP3-encoded so you", "need to enable LAME support by passing \"--enable-libmp3lame\" to configure. The mapping", "is particularly useful for DVD transcoding to get the desired audio language.", "NOTE: To see the supported input formats, use \"ffmpeg -demuxers\".", "• You can extract images from a video, or create a video from many images:", "For extracting images from a video:", "ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg", "This will extract one video frame per second from the video and will output them in files", "named foo-001.jpeg, foo-002.jpeg, etc. Images will be rescaled to fit the new WxH values.", "If you want to extract just a limited number of frames, you can use the above command in", "combination with the \"-frames:v\" or \"-t\" option, or in combination with -ss to start", "extracting from a certain point in time.", "For creating a video from many images:", "ffmpeg -f image2 -framerate 12 -i foo-%03d.jpeg -s WxH foo.avi", "The syntax \"foo-%03d.jpeg\" specifies to use a decimal number composed of three digits", "padded with zeroes to express the sequence number. It is the same syntax supported by the", "C printf function, but only formats accepting a normal integer are suitable.", "When importing an image sequence, -i also supports expanding shell-like wildcard patterns", "(globbing) internally, by selecting the image2-specific \"-patterntype glob\" option.", "For example, for creating a video from filenames matching the glob pattern \"foo-*.jpeg\":", "ffmpeg -f image2 -patterntype glob -framerate 12 -i 'foo-*.jpeg' -s WxH foo.avi", "• You can put many streams of the same type in the output:", "ffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut", "The resulting output file test12.nut will contain the first four streams from the input", "files in reverse order.", "• To force CBR video output:", "ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v", "• The four options lmin, lmax, mblmin and mblmax use 'lambda' units, but you may use the", "QP2LAMBDA constant to easily convert from 'q' units:", "ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext" ], "see_also": [ { "name": "ffmpeg", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg/1/json" }, { "name": "ffplay", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffplay/1/json" }, { "name": "ffprobe", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffprobe/1/json" }, { "name": "ffmpeg-utils", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-utils/1/json" }, { "name": "ffmpeg-scaler", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-scaler/1/json" }, { "name": "ffmpeg-resampler", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-resampler/1/json" }, { "name": "ffmpeg-codecs", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-codecs/1/json" }, { "name": "ffmpeg-bitstream-filters", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-bitstream-filters/1/json" }, { "name": "ffmpeg-formats", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-formats/1/json" }, { "name": "ffmpeg-devices", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-devices/1/json" }, { "name": "ffmpeg-protocols", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-protocols/1/json" }, { "name": "ffmpeg-filters", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ffmpeg-filters/1/json" } ], "section_outline": [ { "name": "NAME", "lines": 2, "subsections": [] }, { "name": "SYNOPSIS", "lines": 3, "subsections": [] }, { "name": "DESCRIPTION", "lines": 50, "subsections": [] }, { "name": "DETAILED DESCRIPTION", "lines": 29, "subsections": [ { "name": "Filtering", "lines": 69 }, { "name": "Stream copy", "lines": 15 } ] }, { "name": "STREAM SELECTION", "lines": 6, "subsections": [ { "name": "Description", "lines": 60 }, { "name": "Examples", "lines": 122 } ] }, { "name": "OPTIONS", "lines": 13, "subsections": [ { "name": "Stream specifiers", "lines": 48 }, { "name": "Generic options", "lines": 2 }, { "name": "-L", "lines": 1, "flag": "-L" }, { "name": "-h, -?, -help, --help [_", "lines": 40, "flag": "-?", "long": "--help" }, { "name": "-version", "lines": 2 }, { "name": "-buildconf", "lines": 2 }, { "name": "-formats", "lines": 2 }, { "name": "-demuxers", "lines": 2 }, { "name": "-muxers", "lines": 2 }, { "name": "-devices", "lines": 2 }, { "name": "-codecs", "lines": 5 }, { "name": "-decoders", "lines": 2 }, { "name": "-encoders", "lines": 2 }, { "name": "-bsfs", "lines": 2 }, { "name": "-protocols", "lines": 2 }, { "name": "-filters", "lines": 2 }, { "name": "-pix_fmts", "lines": 2 }, { "name": "-sample_fmts", "lines": 2 }, { "name": "-layouts", "lines": 2 }, { "name": "-dispositions", "lines": 2 }, { "name": "-colors", "lines": 2 }, { "name": "-sources _", "lines": 6 }, { "name": "-sinks _", "lines": 6 }, { "name": "-loglevel [_", "lines": 63 }, { "name": "-report", "lines": 26 }, { "name": 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"name": "PCM Archimedes VIDC : X @tab X", "lines": 1 }, { "name": "PCM signed 8-bit planar : X @tab X", "lines": 1 }, { "name": "PCM signed 16-bit big-endian planar : X @tab X", "lines": 1 }, { "name": "PCM signed 16-bit little-endian planar : X @tab X", "lines": 1 }, { "name": "PCM signed 24-bit little-endian planar : X @tab X", "lines": 1 }, { "name": "PCM signed 32-bit little-endian planar : X @tab X", "lines": 1 }, { "name": "PCM 32-bit floating point big-endian : X @tab X", "lines": 1 }, { "name": "PCM 32-bit floating point little-endian : X @tab X", "lines": 1 }, { "name": "PCM 64-bit floating point big-endian : X @tab X", "lines": 1 }, { "name": "PCM 64-bit floating point little-endian : X @tab X", "lines": 1 }, { "name": "PCM D-Cinema audio signed 24-bit : X @tab X", "lines": 1 }, { "name": "PCM signed 8-bit : X @tab X", "lines": 1 }, { "name": "PCM signed 16-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 16-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 24-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 24-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 32-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 32-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM signed 16/20/24-bit big-endian in MPEG-TS : @tab X", "lines": 1 }, { "name": "PCM unsigned 8-bit : X @tab X", "lines": 1 }, { "name": "PCM unsigned 16-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM unsigned 16-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM unsigned 24-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM unsigned 24-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM unsigned 32-bit big-endian : X @tab X", "lines": 1 }, { "name": "PCM unsigned 32-bit little-endian : X @tab X", "lines": 1 }, { "name": "PCM SGA : @tab X", "lines": 1 }, { "name": "QCELP / PureVoice : @tab X", "lines": 1 }, { "name": "QDesign Music Codec 1 : @tab X", "lines": 1 }, { "name": "QDesign Music Codec 2 : @tab X", "lines": 2 }, { "name": "RealAudio 1.0 (14.4K) : X @tab X", "lines": 2 }, { "name": "RealAudio 2.0 (28.8K) : @tab X", "lines": 2 }, { "name": "RealAudio 3.0 (dnet) : IX @tab X", "lines": 2 }, { "name": "RealAudio Lossless : @tab X", "lines": 1 }, { "name": "RealAudio SIPR / ACELP.NET : @tab X", "lines": 1 }, { "name": "RK Audio (RKA) : @tab X", "lines": 1 }, { "name": "SBC (low-complexity subband codec) : X @tab X", "lines": 2 }, { "name": "Shorten : @tab X", "lines": 1 }, { "name": "Sierra VMD audio : @tab X", "lines": 2 }, { "name": "Smacker audio : @tab X", "lines": 1 }, { "name": "SMPTE 302M AES3 audio : X @tab X", "lines": 1 }, { "name": "Sonic : X @tab X", "lines": 2 }, { "name": "Sonic lossless : X @tab X", "lines": 2 }, { "name": "Speex : E @tab EX", "lines": 2 }, { "name": "TAK (Tom's lossless Audio Kompressor) : @tab X", "lines": 1 }, { "name": "True Audio (TTA) : X @tab X", "lines": 1 }, { "name": "TrueHD : X @tab X", "lines": 2 }, { "name": "TwinVQ (VQF flavor) : @tab X", "lines": 1 }, { "name": "VIMA : @tab X", "lines": 2 }, { "name": "ViewQuest VQC : @tab X", "lines": 1 }, { "name": "Vorbis : E @tab X", "lines": 2 }, { "name": "Voxware MetaSound : @tab X", "lines": 1 }, { "name": "Waveform Archiver : @tab X", "lines": 1 }, { "name": "WavPack : X @tab X", "lines": 1 }, { "name": "Westwood Audio (SND1) : @tab X", "lines": 1 }, { "name": "Windows Media Audio 1 : X @tab X", "lines": 1 }, { "name": "Windows Media Audio 2 : X @tab X", "lines": 1 }, { "name": "Windows Media Audio Lossless : @tab X", "lines": 1 }, { "name": "Windows Media Audio Pro : @tab X", "lines": 1 }, { "name": "Windows Media Audio Voice : @tab X", "lines": 1 }, { "name": "Xbox Media Audio 1 : @tab X", "lines": 1 }, { "name": "Xbox Media Audio 2 : @tab X", "lines": 7 }, { "name": "Subtitle Formats", "lines": 1 }, { "name": "Name : Muxing @tab Demuxing @tab Encoding @tab Decoding", "lines": 1 }, { "name": "3GPP Timed Text : @tab @tab X @tab X", "lines": 1 }, { "name": "AQTitle : @tab X @tab @tab X", "lines": 1 }, { "name": "DVB : X @tab X @tab X @tab X", "lines": 1 }, { "name": "DVB teletext : @tab X @tab @tab E", "lines": 1 }, { "name": "DVD : X @tab X @tab X @tab X", "lines": 1 }, { "name": "JACOsub : X @tab X @tab @tab X", "lines": 1 }, { "name": "MicroDVD : X @tab X @tab @tab X", "lines": 1 }, { "name": "MPL2 : @tab X @tab @tab X", "lines": 1 }, { "name": "MPsub (MPlayer) : @tab X @tab @tab X", "lines": 1 }, { "name": "PGS : @tab @tab @tab X", "lines": 1 }, { "name": "PJS (Phoenix) : @tab X @tab @tab X", "lines": 1 }, { "name": "RealText : @tab X @tab @tab X", "lines": 1 }, { "name": "SAMI : @tab X @tab @tab X", "lines": 1 }, { "name": "Spruce format (STL) : @tab X @tab @tab X", "lines": 1 }, { "name": "SSA/ASS : X @tab X @tab X @tab X", "lines": 1 }, { "name": "SubRip (SRT) : X @tab X @tab X @tab X", "lines": 1 }, { "name": "SubViewer v1 : @tab X @tab @tab X", "lines": 1 }, { "name": "SubViewer : @tab X @tab @tab X", "lines": 1 }, { "name": "TED Talks captions : @tab X @tab @tab X", "lines": 1 }, { "name": "TTML : X @tab @tab X @tab", "lines": 1 }, { "name": "VobSub (IDX+SUB) : @tab X @tab @tab X", "lines": 1 }, { "name": "VPlayer : @tab X @tab @tab X", "lines": 1 }, { "name": "WebVTT : X @tab X @tab X @tab X", "lines": 1 }, { "name": "XSUB : @tab @tab X @tab X", "lines": 4 }, { "name": "Network Protocols", "lines": 1 }, { "name": "Name : Support", "lines": 1 }, { "name": "AMQP : E", "lines": 1 }, { "name": "file : X", "lines": 1 }, { "name": "FTP : X", "lines": 1 }, { "name": "Gopher : X", "lines": 1 }, { "name": "Gophers : X", "lines": 1 }, { "name": "HLS : X", "lines": 1 }, { "name": "HTTP : X", "lines": 1 }, { "name": "HTTPS : X", "lines": 1 }, { "name": "Icecast : X", "lines": 1 }, { "name": "MMSH : X", "lines": 1 }, { "name": "MMST : X", "lines": 1 }, { "name": "pipe : X", "lines": 1 }, { "name": "Pro-MPEG FEC : X", "lines": 1 }, { "name": "RTMP : X", "lines": 1 }, { "name": "RTMPE : X", "lines": 1 }, { "name": "RTMPS : X", "lines": 1 }, { "name": "RTMPT : X", "lines": 1 }, { "name": "RTMPTE : X", "lines": 1 }, { "name": "RTMPTS : X", "lines": 1 }, { "name": "RTP : X", "lines": 1 }, { "name": "SAMBA : E", "lines": 1 }, { "name": "SCTP : X", "lines": 1 }, { "name": "SFTP : E", "lines": 1 }, { "name": "TCP : X", "lines": 1 }, { "name": "TLS : X", "lines": 1 }, { "name": "UDP : X", "lines": 1 }, { "name": "ZMQ : E", "lines": 4 }, { "name": "Input/Output Devices", "lines": 1 }, { "name": "Name : Input @tab Output", "lines": 1 }, { "name": "ALSA : X @tab X", "lines": 1 }, { "name": "BKTR : X @tab", "lines": 1 }, { "name": "caca : @tab X", "lines": 1 }, { "name": "DV1394 : X @tab", "lines": 1 }, { "name": "Lavfi virtual device : X @tab", "lines": 1 }, { "name": "Linux framebuffer : X @tab X", "lines": 1 }, { "name": "JACK : X @tab", "lines": 1 }, { "name": "LIBCDIO : X", "lines": 1 }, { "name": "LIBDC1394 : X @tab", "lines": 1 }, { "name": "OpenAL : X", "lines": 1 }, { "name": "OpenGL : @tab X", "lines": 1 }, { "name": "OSS : X @tab X", "lines": 1 }, { "name": "PulseAudio : X @tab X", "lines": 1 }, { "name": "SDL : @tab X", "lines": 1 }, { "name": "Video4Linux2 : X @tab X", "lines": 1 }, { "name": "VfW capture : X @tab", "lines": 1 }, { "name": "X11 grabbing : X @tab", "lines": 1 }, { "name": "Win32 grabbing : X @tab", "lines": 2 }, { "name": "Timecode", "lines": 1 }, { "name": "Codec/format : Read @tab Write", "lines": 1 }, { "name": "AVI : X @tab X", "lines": 1 }, { "name": "DV : X @tab X", "lines": 1 }, { "name": "GXF : X @tab X", "lines": 1 }, { "name": "MOV : X @tab X", "lines": 1 }, { "name": "MPEG1/2 : X @tab X", "lines": 1 }, { "name": "MXF : X @tab X", "lines": 1 } ] }, { "name": "SEE ALSO", "lines": 4, "subsections": [] }, { "name": "AUTHORS", "lines": 10, "subsections": [] } ], "sections": { "NAME": { "content": "ffmpeg - ffmpeg media converter\n", "subsections": [] }, "SYNOPSIS": { "content": "ffmpeg [globaloptions] {[inputfileoptions] -i inputurl} ... {[outputfileoptions]\noutputurl} ...\n", "subsections": [] }, "DESCRIPTION": { "content": "ffmpeg is a universal media converter. It can read a wide variety of inputs - including live\ngrabbing/recording devices - filter, and transcode them into a plethora of output formats.\n\nffmpeg reads from an arbitrary number of input \"files\" (which can be regular files, pipes,\nnetwork streams, grabbing devices, etc.), specified by the \"-i\" option, and writes to an\narbitrary number of output \"files\", which are specified by a plain output url. Anything found\non the command line which cannot be interpreted as an option is considered to be an output\nurl.\n\nEach input or output url can, in principle, contain any number of streams of different types\n(video/audio/subtitle/attachment/data). The allowed number and/or types of streams may be\nlimited by the container format. Selecting which streams from which inputs will go into which\noutput is either done automatically or with the \"-map\" option (see the Stream selection\nchapter).\n\nTo refer to input files in options, you must use their indices (0-based). E.g. the first\ninput file is 0, the second is 1, etc. Similarly, streams within a file are referred to by\ntheir indices. E.g. \"2:3\" refers to the fourth stream in the third input file. Also see the\nStream specifiers chapter.\n\nAs a general rule, options are applied to the next specified file. Therefore, order is\nimportant, and you can have the same option on the command line multiple times. Each\noccurrence is then applied to the next input or output file. Exceptions from this rule are\nthe global options (e.g. verbosity level), which should be specified first.\n\nDo not mix input and output files -- first specify all input files, then all output files.\nAlso do not mix options which belong to different files. All options apply ONLY to the next\ninput or output file and are reset between files.\n\nSome simple examples follow.\n\n• Convert an input media file to a different format, by re-encoding media streams:\n\nffmpeg -i input.avi output.mp4\n\n• Set the video bitrate of the output file to 64 kbit/s:\n\nffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4\n\n• Force the frame rate of the output file to 24 fps:\n\nffmpeg -i input.avi -r 24 output.mp4\n\n• Force the frame rate of the input file (valid for raw formats only) to 1 fps and the\nframe rate of the output file to 24 fps:\n\nffmpeg -r 1 -i input.m2v -r 24 output.mp4\n\nThe format option may be needed for raw input files.\n", "subsections": [] }, "DETAILED DESCRIPTION": { "content": "The transcoding process in ffmpeg for each output can be described by the following diagram:\n\n\n| | | |\n| input | demuxer | encoded data | decoder\n| file | ---------> | packets | -----+\n|| || |\nv\n\n| |\n| decoded |\n| frames |\n||\n|\n| | | | |\n| output | <-------- | encoded data | <----+\n| file | muxer | packets | encoder\n|| ||\n\nffmpeg calls the libavformat library (containing demuxers) to read input files and get\npackets containing encoded data from them. When there are multiple input files, ffmpeg tries\nto keep them synchronized by tracking lowest timestamp on any active input stream.\n\nEncoded packets are then passed to the decoder (unless streamcopy is selected for the stream,\nsee further for a description). The decoder produces uncompressed frames (raw video/PCM\naudio/...) which can be processed further by filtering (see next section). After filtering,\nthe frames are passed to the encoder, which encodes them and outputs encoded packets. Finally\nthose are passed to the muxer, which writes the encoded packets to the output file.\n", "subsections": [ { "name": "Filtering", "content": "Before encoding, ffmpeg can process raw audio and video frames using filters from the\nlibavfilter library. Several chained filters form a filter graph. ffmpeg distinguishes\nbetween two types of filtergraphs: simple and complex.\n\nSimple filtergraphs\n\nSimple filtergraphs are those that have exactly one input and output, both of the same type.\nIn the above diagram they can be represented by simply inserting an additional step between\ndecoding and encoding:\n\n\n| | | |\n| decoded | | encoded data |\n| frames |\\ | packets |\n|| \\ /|||\n\\ /\nsimple \\|| | / encoder\nfiltergraph | filtered |/\n| frames |\n||\n\nSimple filtergraphs are configured with the per-stream -filter option (with -vf and -af\naliases for video and audio respectively). A simple filtergraph for video can look for\nexample like this:\n\n\n| | | | | | | |\n| input | ---> | deinterlace | ---> | scale | ---> | output |\n|| || || ||\n\nNote that some filters change frame properties but not frame contents. E.g. the \"fps\" filter\nin the example above changes number of frames, but does not touch the frame contents. Another\nexample is the \"setpts\" filter, which only sets timestamps and otherwise passes the frames\nunchanged.\n\nComplex filtergraphs\n\nComplex filtergraphs are those which cannot be described as simply a linear processing chain\napplied to one stream. This is the case, for example, when the graph has more than one input\nand/or output, or when output stream type is different from input. They can be represented\nwith the following diagram:\n\n\n| |\n| input 0 |\\\n|| \\ | |\n\\ /| output 0 |\n\\ | | / ||\n\\| complex | /\n| | | |/\n| input 1 |---->| filter |\\\n|| | | \\\n/| graph | \\ | |\n/ | | \\| output 1 |\n/ || ||\n| | /\n| input 2 |/\n||\n\nComplex filtergraphs are configured with the -filtercomplex option. Note that this option\nis global, since a complex filtergraph, by its nature, cannot be unambiguously associated\nwith a single stream or file.\n\nThe -lavfi option is equivalent to -filtercomplex.\n\nA trivial example of a complex filtergraph is the \"overlay\" filter, which has two video\ninputs and one video output, containing one video overlaid on top of the other. Its audio\ncounterpart is the \"amix\" filter.\n" }, { "name": "Stream copy", "content": "Stream copy is a mode selected by supplying the \"copy\" parameter to the -codec option. It\nmakes ffmpeg omit the decoding and encoding step for the specified stream, so it does only\ndemuxing and muxing. It is useful for changing the container format or modifying container-\nlevel metadata. The diagram above will, in this case, simplify to this:\n\n\n| | | | | |\n| input | demuxer | encoded data | muxer | output |\n| file | ---------> | packets | -------> | file |\n|| || ||\n\nSince there is no decoding or encoding, it is very fast and there is no quality loss.\nHowever, it might not work in some cases because of many factors. Applying filters is\nobviously also impossible, since filters work on uncompressed data.\n" } ] }, "STREAM SELECTION": { "content": "ffmpeg provides the \"-map\" option for manual control of stream selection in each output file.\nUsers can skip \"-map\" and let ffmpeg perform automatic stream selection as described below.\nThe \"-vn / -an / -sn / -dn\" options can be used to skip inclusion of video, audio, subtitle\nand data streams respectively, whether manually mapped or automatically selected, except for\nthose streams which are outputs of complex filtergraphs.\n", "subsections": [ { "name": "Description", "content": "The sub-sections that follow describe the various rules that are involved in stream\nselection. The examples that follow next show how these rules are applied in practice.\n\nWhile every effort is made to accurately reflect the behavior of the program, FFmpeg is under\ncontinuous development and the code may have changed since the time of this writing.\n\nAutomatic stream selection\n\nIn the absence of any map options for a particular output file, ffmpeg inspects the output\nformat to check which type of streams can be included in it, viz. video, audio and/or\nsubtitles. For each acceptable stream type, ffmpeg will pick one stream, when available, from\namong all the inputs.\n\nIt will select that stream based upon the following criteria:\n\n• for video, it is the stream with the highest resolution,\n\n• for audio, it is the stream with the most channels,\n\n• for subtitles, it is the first subtitle stream found but there's a caveat. The output\nformat's default subtitle encoder can be either text-based or image-based, and only a\nsubtitle stream of the same type will be chosen.\n\nIn the case where several streams of the same type rate equally, the stream with the lowest\nindex is chosen.\n\nData or attachment streams are not automatically selected and can only be included using\n\"-map\".\n\nManual stream selection\n\nWhen \"-map\" is used, only user-mapped streams are included in that output file, with one\npossible exception for filtergraph outputs described below.\n\nComplex filtergraphs\n\nIf there are any complex filtergraph output streams with unlabeled pads, they will be added\nto the first output file. This will lead to a fatal error if the stream type is not supported\nby the output format. In the absence of the map option, the inclusion of these streams leads\nto the automatic stream selection of their types being skipped. If map options are present,\nthese filtergraph streams are included in addition to the mapped streams.\n\nComplex filtergraph output streams with labeled pads must be mapped once and exactly once.\n\nStream handling\n\nStream handling is independent of stream selection, with an exception for subtitles described\nbelow. Stream handling is set via the \"-codec\" option addressed to streams within a specific\noutput file. In particular, codec options are applied by ffmpeg after the stream selection\nprocess and thus do not influence the latter. If no \"-codec\" option is specified for a stream\ntype, ffmpeg will select the default encoder registered by the output file muxer.\n\nAn exception exists for subtitles. If a subtitle encoder is specified for an output file, the\nfirst subtitle stream found of any type, text or image, will be included. ffmpeg does not\nvalidate if the specified encoder can convert the selected stream or if the converted stream\nis acceptable within the output format. This applies generally as well: when the user sets an\nencoder manually, the stream selection process cannot check if the encoded stream can be\nmuxed into the output file. If it cannot, ffmpeg will abort and all output files will fail\nto be processed.\n" }, { "name": "Examples", "content": "The following examples illustrate the behavior, quirks and limitations of ffmpeg's stream\nselection methods.\n\nThey assume the following three input files.\n\ninput file 'A.avi'\nstream 0: video 640x360\nstream 1: audio 2 channels\n\ninput file 'B.mp4'\nstream 0: video 1920x1080\nstream 1: audio 2 channels\nstream 2: subtitles (text)\nstream 3: audio 5.1 channels\nstream 4: subtitles (text)\n\ninput file 'C.mkv'\nstream 0: video 1280x720\nstream 1: audio 2 channels\nstream 2: subtitles (image)\n\nExample: automatic stream selection\n\nffmpeg -i A.avi -i B.mp4 out1.mkv out2.wav -map 1:a -c:a copy out3.mov\n\nThere are three output files specified, and for the first two, no \"-map\" options are set, so\nffmpeg will select streams for these two files automatically.\n\nout1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so\nffmpeg will try to select one of each type.For video, it will select \"stream 0\" from B.mp4,\nwhich has the highest resolution among all the input video streams.For audio, it will select\n\"stream 3\" from B.mp4, since it has the greatest number of channels.For subtitles, it will\nselect \"stream 2\" from B.mp4, which is the first subtitle stream from among A.avi and B.mp4.\n\nout2.wav accepts only audio streams, so only \"stream 3\" from B.mp4 is selected.\n\nFor out3.mov, since a \"-map\" option is set, no automatic stream selection will occur. The\n\"-map 1:a\" option will select all audio streams from the second input B.mp4. No other streams\nwill be included in this output file.\n\nFor the first two outputs, all included streams will be transcoded. The encoders chosen will\nbe the default ones registered by each output format, which may not match the codec of the\nselected input streams.\n\nFor the third output, codec option for audio streams has been set to \"copy\", so no decoding-\nfiltering-encoding operations will occur, or can occur. Packets of selected streams shall be\nconveyed from the input file and muxed within the output file.\n\nExample: automatic subtitles selection\n\nffmpeg -i C.mkv out1.mkv -c:s dvdsub -an out2.mkv\n\nAlthough out1.mkv is a Matroska container file which accepts subtitle streams, only a video\nand audio stream shall be selected. The subtitle stream of C.mkv is image-based and the\ndefault subtitle encoder of the Matroska muxer is text-based, so a transcode operation for\nthe subtitles is expected to fail and hence the stream isn't selected. However, in out2.mkv,\na subtitle encoder is specified in the command and so, the subtitle stream is selected, in\naddition to the video stream. The presence of \"-an\" disables audio stream selection for\nout2.mkv.\n\nExample: unlabeled filtergraph outputs\n\nffmpeg -i A.avi -i C.mkv -i B.mp4 -filtercomplex \"overlay\" out1.mp4 out2.srt\n\nA filtergraph is setup here using the \"-filtercomplex\" option and consists of a single video\nfilter. The \"overlay\" filter requires exactly two video inputs, but none are specified, so\nthe first two available video streams are used, those of A.avi and C.mkv. The output pad of\nthe filter has no label and so is sent to the first output file out1.mp4. Due to this,\nautomatic selection of the video stream is skipped, which would have selected the stream in\nB.mp4. The audio stream with most channels viz. \"stream 3\" in B.mp4, is chosen automatically.\nNo subtitle stream is chosen however, since the MP4 format has no default subtitle encoder\nregistered, and the user hasn't specified a subtitle encoder.\n\nThe 2nd output file, out2.srt, only accepts text-based subtitle streams. So, even though the\nfirst subtitle stream available belongs to C.mkv, it is image-based and hence skipped. The\nselected stream, \"stream 2\" in B.mp4, is the first text-based subtitle stream.\n\nExample: labeled filtergraph outputs\n\nffmpeg -i A.avi -i B.mp4 -i C.mkv -filtercomplex \"[1:v]hue=s=0[outv];overlay;aresample\" \\\n-map '[outv]' -an out1.mp4 \\\nout2.mkv \\\n-map '[outv]' -map 1:a:0 out3.mkv\n\nThe above command will fail, as the output pad labelled \"[outv]\" has been mapped twice. None\nof the output files shall be processed.\n\nffmpeg -i A.avi -i B.mp4 -i C.mkv -filtercomplex \"[1:v]hue=s=0[outv];overlay;aresample\" \\\n-an out1.mp4 \\\nout2.mkv \\\n-map 1:a:0 out3.mkv\n\nThis command above will also fail as the hue filter output has a label, \"[outv]\", and hasn't\nbeen mapped anywhere.\n\nThe command should be modified as follows,\n\nffmpeg -i A.avi -i B.mp4 -i C.mkv -filtercomplex \"[1:v]hue=s=0,split=2[outv1][outv2];overlay;aresample\" \\\n-map '[outv1]' -an out1.mp4 \\\nout2.mkv \\\n-map '[outv2]' -map 1:a:0 out3.mkv\n\nThe video stream from B.mp4 is sent to the hue filter, whose output is cloned once using the\nsplit filter, and both outputs labelled. Then a copy each is mapped to the first and third\noutput files.\n\nThe overlay filter, requiring two video inputs, uses the first two unused video streams.\nThose are the streams from A.avi and C.mkv. The overlay output isn't labelled, so it is sent\nto the first output file out1.mp4, regardless of the presence of the \"-map\" option.\n\nThe aresample filter is sent the first unused audio stream, that of A.avi. Since this filter\noutput is also unlabelled, it too is mapped to the first output file. The presence of \"-an\"\nonly suppresses automatic or manual stream selection of audio streams, not outputs sent from\nfiltergraphs. Both these mapped streams shall be ordered before the mapped stream in\nout1.mp4.\n\nThe video, audio and subtitle streams mapped to \"out2.mkv\" are entirely determined by\nautomatic stream selection.\n\nout3.mkv consists of the cloned video output from the hue filter and the first audio stream\nfrom B.mp4.\n" } ] }, "OPTIONS": { "content": "All the numerical options, if not specified otherwise, accept a string representing a number\nas input, which may be followed by one of the SI unit prefixes, for example: 'K', 'M', or\n'G'.\n\nIf 'i' is appended to the SI unit prefix, the complete prefix will be interpreted as a unit\nprefix for binary multiples, which are based on powers of 1024 instead of powers of 1000.\nAppending 'B' to the SI unit prefix multiplies the value by 8. This allows using, for\nexample: 'KB', 'MiB', 'G' and 'B' as number suffixes.\n\nOptions which do not take arguments are boolean options, and set the corresponding value to\ntrue. They can be set to false by prefixing the option name with \"no\". For example using\n\"-nofoo\" will set the boolean option with name \"foo\" to false.\n", "subsections": [ { "name": "Stream specifiers", "content": "Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers are used to\nprecisely specify which stream(s) a given option belongs to.\n\nA stream specifier is a string generally appended to the option name and separated from it by\na colon. E.g. \"-codec:a:1 ac3\" contains the \"a:1\" stream specifier, which matches the second\naudio stream. Therefore, it would select the ac3 codec for the second audio stream.\n\nA stream specifier can match several streams, so that the option is applied to all of them.\nE.g. the stream specifier in \"-b:a 128k\" matches all audio streams.\n\nAn empty stream specifier matches all streams. For example, \"-codec copy\" or \"-codec: copy\"\nwould copy all the streams without reencoding.\n\nPossible forms of stream specifiers are:\n\nstreamindex\nMatches the stream with this index. E.g. \"-threads:1 4\" would set the thread count for\nthe second stream to 4. If streamindex is used as an additional stream specifier (see\nbelow), then it selects stream number streamindex from the matching streams. Stream\nnumbering is based on the order of the streams as detected by libavformat except when a\nprogram ID is also specified. In this case it is based on the ordering of the streams in\nthe program.\n\nstreamtype[:additionalstreamspecifier]\nstreamtype is one of following: 'v' or 'V' for video, 'a' for audio, 's' for subtitle,\n'd' for data, and 't' for attachments. 'v' matches all video streams, 'V' only matches\nvideo streams which are not attached pictures, video thumbnails or cover arts. If\nadditionalstreamspecifier is used, then it matches streams which both have this type\nand match the additionalstreamspecifier. Otherwise, it matches all streams of the\nspecified type.\n\np:programid[:additionalstreamspecifier]\nMatches streams which are in the program with the id programid. If\nadditionalstreamspecifier is used, then it matches streams which both are part of the\nprogram and match the additionalstreamspecifier.\n\n#streamid or i:streamid\nMatch the stream by stream id (e.g. PID in MPEG-TS container).\n\nm:key[:value]\nMatches streams with the metadata tag key having the specified value. If value is not\ngiven, matches streams that contain the given tag with any value.\n\nu Matches streams with usable configuration, the codec must be defined and the essential\ninformation such as video dimension or audio sample rate must be present.\n\nNote that in ffmpeg, matching by metadata will only work properly for input files.\n" }, { "name": "Generic options", "content": "These options are shared amongst the ff* tools.\n" }, { "name": "-L", "content": "", "flag": "-L" }, { "name": "-h, -?, -help, --help [_", "content": "Show help. An optional parameter may be specified to print help about a specific item. If\nno argument is specified, only basic (non advanced) tool options are shown.\n\nPossible values of arg are:\n\nlong\nPrint advanced tool options in addition to the basic tool options.\n\nfull\nPrint complete list of options, including shared and private options for encoders,\ndecoders, demuxers, muxers, filters, etc.\n\ndecoder=decodername\nPrint detailed information about the decoder named decodername. Use the -decoders\noption to get a list of all decoders.\n\nencoder=encodername\nPrint detailed information about the encoder named encodername. Use the -encoders\noption to get a list of all encoders.\n\ndemuxer=demuxername\nPrint detailed information about the demuxer named demuxername. Use the -formats\noption to get a list of all demuxers and muxers.\n\nmuxer=muxername\nPrint detailed information about the muxer named muxername. Use the -formats option\nto get a list of all muxers and demuxers.\n\nfilter=filtername\nPrint detailed information about the filter named filtername. Use the -filters\noption to get a list of all filters.\n\nbsf=bitstreamfiltername\nPrint detailed information about the bitstream filter named bitstreamfiltername.\nUse the -bsfs option to get a list of all bitstream filters.\n\nprotocol=protocolname\nPrint detailed information about the protocol named protocolname. Use the\n-protocols option to get a list of all protocols.\n", "flag": "-?", "long": "--help" }, { "name": "-version", "content": "Show version.\n" }, { "name": "-buildconf", "content": "Show the build configuration, one option per line.\n" }, { "name": "-formats", "content": "Show available formats (including devices).\n" }, { "name": "-demuxers", "content": "Show available demuxers.\n" }, { "name": "-muxers", "content": "Show available muxers.\n" }, { "name": "-devices", "content": "Show available devices.\n" }, { "name": "-codecs", "content": "Show all codecs known to libavcodec.\n\nNote that the term 'codec' is used throughout this documentation as a shortcut for what\nis more correctly called a media bitstream format.\n" }, { "name": "-decoders", "content": "Show available decoders.\n" }, { "name": "-encoders", "content": "Show all available encoders.\n" }, { "name": "-bsfs", "content": "Show available bitstream filters.\n" }, { "name": "-protocols", "content": "Show available protocols.\n" }, { "name": "-filters", "content": "Show available libavfilter filters.\n" }, { "name": "-pix_fmts", "content": "Show available pixel formats.\n" }, { "name": "-sample_fmts", "content": "Show available sample formats.\n" }, { "name": "-layouts", "content": "Show channel names and standard channel layouts.\n" }, { "name": "-dispositions", "content": "Show stream dispositions.\n" }, { "name": "-colors", "content": "Show recognized color names.\n" }, { "name": "-sources _", "content": "Show autodetected sources of the input device. Some devices may provide system-dependent\nsource names that cannot be autodetected. The returned list cannot be assumed to be\nalways complete.\n\nffmpeg -sources pulse,server=192.168.0.4\n" }, { "name": "-sinks _", "content": "Show autodetected sinks of the output device. Some devices may provide system-dependent\nsink names that cannot be autodetected. The returned list cannot be assumed to be always\ncomplete.\n\nffmpeg -sinks pulse,server=192.168.0.4\n" }, { "name": "-loglevel [_", "content": "Set logging level and flags used by the library.\n\nThe optional flags prefix can consist of the following values:\n\nrepeat\nIndicates that repeated log output should not be compressed to the first line and the\n\"Last message repeated n times\" line will be omitted.\n\nlevel\nIndicates that log output should add a \"[level]\" prefix to each message line. This\ncan be used as an alternative to log coloring, e.g. when dumping the log to file.\n\nFlags can also be used alone by adding a '+'/'-' prefix to set/reset a single flag\nwithout affecting other flags or changing loglevel. When setting both flags and loglevel,\na '+' separator is expected between the last flags value and before loglevel.\n\nloglevel is a string or a number containing one of the following values:\n\nquiet, -8\nShow nothing at all; be silent.\n\npanic, 0\nOnly show fatal errors which could lead the process to crash, such as an assertion\nfailure. This is not currently used for anything.\n\nfatal, 8\nOnly show fatal errors. These are errors after which the process absolutely cannot\ncontinue.\n\nerror, 16\nShow all errors, including ones which can be recovered from.\n\nwarning, 24\nShow all warnings and errors. Any message related to possibly incorrect or unexpected\nevents will be shown.\n\ninfo, 32\nShow informative messages during processing. This is in addition to warnings and\nerrors. This is the default value.\n\nverbose, 40\nSame as \"info\", except more verbose.\n\ndebug, 48\nShow everything, including debugging information.\n\ntrace, 56\n\nFor example to enable repeated log output, add the \"level\" prefix, and set loglevel to\n\"verbose\":\n\nffmpeg -loglevel repeat+level+verbose -i input output\n\nAnother example that enables repeated log output without affecting current state of\n\"level\" prefix flag or loglevel:\n\nffmpeg [...] -loglevel +repeat\n\nBy default the program logs to stderr. If coloring is supported by the terminal, colors\nare used to mark errors and warnings. Log coloring can be disabled setting the\nenvironment variable AVLOGFORCENOCOLOR, or can be forced setting the environment\nvariable AVLOGFORCECOLOR.\n" }, { "name": "-report", "content": "Dump full command line and log output to a file named \"program-YYYYMMDD-HHMMSS.log\" in\nthe current directory. This file can be useful for bug reports. It also implies\n\"-loglevel debug\".\n\nSetting the environment variable FFREPORT to any value has the same effect. If the value\nis a ':'-separated key=value sequence, these options will affect the report; option\nvalues must be escaped if they contain special characters or the options delimiter ':'\n(see the ``Quoting and escaping'' section in the ffmpeg-utils manual).\n\nThe following options are recognized:\n\nfile\nset the file name to use for the report; %p is expanded to the name of the program,\n%t is expanded to a timestamp, \"%%\" is expanded to a plain \"%\"\n\nlevel\nset the log verbosity level using a numerical value (see \"-loglevel\").\n\nFor example, to output a report to a file named ffreport.log using a log level of 32\n(alias for log level \"info\"):\n\nFFREPORT=file=ffreport.log:level=32 ffmpeg -i input output\n\nErrors in parsing the environment variable are not fatal, and will not appear in the\nreport.\n" }, { "name": "-hide_banner", "content": "Suppress printing banner.\n\nAll FFmpeg tools will normally show a copyright notice, build options and library\nversions. This option can be used to suppress printing this information.\n" }, { "name": "-cpuflags flags (_", "content": "Allows setting and clearing cpu flags. This option is intended for testing. Do not use it\nunless you know what you're doing.\n\nffmpeg -cpuflags -sse+mmx ...\nffmpeg -cpuflags mmx ...\nffmpeg -cpuflags 0 ...\n\nPossible flags for this option are:\n\nx86\nmmx\nmmxext\nsse\nsse2\nsse2slow\nsse3\nsse3slow\nssse3\natom\nsse4.1\nsse4.2\navx\navx2\nxop\nfma3\nfma4\n3dnow\n3dnowext\nbmi1\nbmi2\ncmov\nARM\narmv5te\narmv6\narmv6t2\nvfp\nvfpv3\nneon\nsetend\nAArch64\narmv8\nvfp\nneon\nPowerPC\naltivec\nSpecific Processors\npentium2\npentium3\npentium4\nk6\nk62\nathlon\nathlonxp\nk8" }, { "name": "-cpucount _", "content": "Override detection of CPU count. This option is intended for testing. Do not use it\nunless you know what you're doing.\n\nffmpeg -cpucount 2\n" }, { "name": "-max_alloc _", "content": "Set the maximum size limit for allocating a block on the heap by ffmpeg's family of\nmalloc functions. Exercise extreme caution when using this option. Don't use if you do\nnot understand the full consequence of doing so. Default is INTMAX.\n" }, { "name": "AVOptions", "content": "These options are provided directly by the libavformat, libavdevice and libavcodec libraries.\nTo see the list of available AVOptions, use the -help option. They are separated into two\ncategories:\n" }, { "name": "generic", "content": "These options can be set for any container, codec or device. Generic options are listed\nunder AVFormatContext options for containers/devices and under AVCodecContext options for\ncodecs.\n" }, { "name": "private", "content": "These options are specific to the given container, device or codec. Private options are\nlisted under their corresponding containers/devices/codecs.\n\nFor example to write an ID3v2.3 header instead of a default ID3v2.4 to an MP3 file, use the\nid3v2version private option of the MP3 muxer:\n\nffmpeg -i input.flac -id3v2version 3 out.mp3\n\nAll codec AVOptions are per-stream, and thus a stream specifier should be attached to them:\n\nffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4\n\nIn the above example, a multichannel audio stream is mapped twice for output. The first\ninstance is encoded with codec ac3 and bitrate 640k. The second instance is downmixed to 2\nchannels and encoded with codec aac. A bitrate of 128k is specified for it using absolute\nindex of the output stream.\n\nNote: the -nooption syntax cannot be used for boolean AVOptions, use -option 0/-option 1.\n\nNote: the old undocumented way of specifying per-stream AVOptions by prepending v/a/s to the\noptions name is now obsolete and will be removed soon.\n" }, { "name": "Main options", "content": "" }, { "name": "-f _", "content": "Force input or output file format. The format is normally auto detected for input files\nand guessed from the file extension for output files, so this option is not needed in\nmost cases.\n", "flag": "-f" }, { "name": "-i _", "content": "input file url\n", "flag": "-i" }, { "name": "-y (_", "content": "Overwrite output files without asking.\n", "flag": "-y" }, { "name": "-n (_", "content": "Do not overwrite output files, and exit immediately if a specified output file already\nexists.\n", "flag": "-n" }, { "name": "-stream_loop _", "content": "Set number of times input stream shall be looped. Loop 0 means no loop, loop -1 means\ninfinite loop.\n" }, { "name": "-recast_media (_", "content": "Allow forcing a decoder of a different media type than the one detected or designated by\nthe demuxer. Useful for decoding media data muxed as data streams.\n" }, { "name": "-c[:_", "content": "" }, { "name": "-codec[:_", "content": "Select an encoder (when used before an output file) or a decoder (when used before an\ninput file) for one or more streams. codec is the name of a decoder/encoder or a special\nvalue \"copy\" (output only) to indicate that the stream is not to be re-encoded.\n\nFor example\n\nffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT\n\nencodes all video streams with libx264 and copies all audio streams.\n\nFor each stream, the last matching \"c\" option is applied, so\n\nffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT\n\nwill copy all the streams except the second video, which will be encoded with libx264,\nand the 138th audio, which will be encoded with libvorbis.\n" }, { "name": "-t _", "content": "When used as an input option (before \"-i\"), limit the duration of data read from the\ninput file.\n\nWhen used as an output option (before an output url), stop writing the output after its\nduration reaches duration.\n\nduration must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual.\n\n-to and -t are mutually exclusive and -t has priority.\n", "flag": "-t" }, { "name": "-to _", "content": "Stop writing the output or reading the input at position. position must be a time\nduration specification, see the Time duration section in the ffmpeg-utils(1) manual.\n\n-to and -t are mutually exclusive and -t has priority.\n" }, { "name": "-fs _", "content": "Set the file size limit, expressed in bytes. No further chunk of bytes is written after\nthe limit is exceeded. The size of the output file is slightly more than the requested\nfile size.\n" }, { "name": "-ss _", "content": "When used as an input option (before \"-i\"), seeks in this input file to position. Note\nthat in most formats it is not possible to seek exactly, so ffmpeg will seek to the\nclosest seek point before position. When transcoding and -accurateseek is enabled (the\ndefault), this extra segment between the seek point and position will be decoded and\ndiscarded. When doing stream copy or when -noaccurateseek is used, it will be preserved.\n\nWhen used as an output option (before an output url), decodes but discards input until\nthe timestamps reach position.\n\nposition must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual.\n" }, { "name": "-sseof _", "content": "Like the \"-ss\" option but relative to the \"end of file\". That is negative values are\nearlier in the file, 0 is at EOF.\n" }, { "name": "-isync _", "content": "Assign an input as a sync source.\n\nThis will take the difference between the start times of the target and reference inputs\nand offset the timestamps of the target file by that difference. The source timestamps of\nthe two inputs should derive from the same clock source for expected results. If \"copyts\"\nis set then \"startatzero\" must also be set. If either of the inputs has no starting\ntimestamp then no sync adjustment is made.\n\nAcceptable values are those that refer to a valid ffmpeg input index. If the sync\nreference is the target index itself or -1, then no adjustment is made to target\ntimestamps. A sync reference may not itself be synced to any other input.\n\nDefault value is -1.\n" }, { "name": "-itsoffset _", "content": "Set the input time offset.\n\noffset must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual.\n\nThe offset is added to the timestamps of the input files. Specifying a positive offset\nmeans that the corresponding streams are delayed by the time duration specified in\noffset.\n" }, { "name": "-itsscale _", "content": "Rescale input timestamps. scale should be a floating point number.\n" }, { "name": "-timestamp _", "content": "Set the recording timestamp in the container.\n\ndate must be a date specification, see the Date section in the ffmpeg-utils(1) manual.\n" }, { "name": "-metadata[:metadata_specifier] _", "content": "Set a metadata key/value pair.\n\nAn optional metadataspecifier may be given to set metadata on streams, chapters or\nprograms. See \"-mapmetadata\" documentation for details.\n\nThis option overrides metadata set with \"-mapmetadata\". It is also possible to delete\nmetadata by using an empty value.\n\nFor example, for setting the title in the output file:\n\nffmpeg -i in.avi -metadata title=\"my title\" out.flv\n\nTo set the language of the first audio stream:\n\nffmpeg -i INPUT -metadata:s:a:0 language=eng OUTPUT\n" }, { "name": "-disposition[:stream_specifier] _", "content": "Sets the disposition for a stream.\n\nBy default, the disposition is copied from the input stream, unless the output stream\nthis option applies to is fed by a complex filtergraph - in that case the disposition is\nunset by default.\n\nvalue is a sequence of items separated by '+' or '-'. The first item may also be prefixed\nwith '+' or '-', in which case this option modifies the default value. Otherwise (the\nfirst item is not prefixed) this options overrides the default value. A '+' prefix adds\nthe given disposition, '-' removes it. It is also possible to clear the disposition by\nsetting it to 0.\n\nIf no \"-disposition\" options were specified for an output file, ffmpeg will automatically\nset the 'default' disposition on the first stream of each type, when there are multiple\nstreams of this type in the output file and no stream of that type is already marked as\ndefault.\n\nThe \"-dispositions\" option lists the known dispositions.\n\nFor example, to make the second audio stream the default stream:\n\nffmpeg -i in.mkv -c copy -disposition:a:1 default out.mkv\n\nTo make the second subtitle stream the default stream and remove the default disposition\nfrom the first subtitle stream:\n\nffmpeg -i in.mkv -c copy -disposition:s:0 0 -disposition:s:1 default out.mkv\n\nTo add an embedded cover/thumbnail:\n\nffmpeg -i in.mp4 -i IMAGE -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attachedpic out.mp4\n\nNot all muxers support embedded thumbnails, and those who do, only support a few formats,\nlike JPEG or PNG.\n" }, { "name": "-program [title=_", "content": "Creates a program with the specified title, programnum and adds the specified stream(s)\nto it.\n" }, { "name": "-target _", "content": "Specify target file type (\"vcd\", \"svcd\", \"dvd\", \"dv\", \"dv50\"). type may be prefixed with\n\"pal-\", \"ntsc-\" or \"film-\" to use the corresponding standard. All the format options\n(bitrate, codecs, buffer sizes) are then set automatically. You can just type:\n\nffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg\n\nNevertheless you can specify additional options as long as you know they do not conflict\nwith the standard, as in:\n\nffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg\n\nThe parameters set for each target are as follows.\n\nVCD\n\n:\n-f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324\n-s 352x288 -r 25\n-codec:v mpeg1video -g 15 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680\n-ar 44100 -ac 2\n-codec:a mp2 -b:a 224k\n\n:\n-f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324\n-s 352x240 -r 30000/1001\n-codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680\n-ar 44100 -ac 2\n-codec:a mp2 -b:a 224k\n\n:\n-f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324\n-s 352x240 -r 24000/1001\n-codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680\n-ar 44100 -ac 2\n-codec:a mp2 -b:a 224k\n\nSVCD\n\n:\n-f svcd -packetsize 2324\n-s 480x576 -pixfmt yuv420p -r 25\n-codec:v mpeg2video -g 15 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1\n-ar 44100\n-codec:a mp2 -b:a 224k\n\n:\n-f svcd -packetsize 2324\n-s 480x480 -pixfmt yuv420p -r 30000/1001\n-codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1\n-ar 44100\n-codec:a mp2 -b:a 224k\n\n:\n-f svcd -packetsize 2324\n-s 480x480 -pixfmt yuv420p -r 24000/1001\n-codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scanoffset 1\n-ar 44100\n-codec:a mp2 -b:a 224k\n\nDVD\n\n:\n-f dvd -muxrate 10080k -packetsize 2048\n-s 720x576 -pixfmt yuv420p -r 25\n-codec:v mpeg2video -g 15 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008\n-ar 48000\n-codec:a ac3 -b:a 448k\n\n:\n-f dvd -muxrate 10080k -packetsize 2048\n-s 720x480 -pixfmt yuv420p -r 30000/1001\n-codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008\n-ar 48000\n-codec:a ac3 -b:a 448k\n\n:\n-f dvd -muxrate 10080k -packetsize 2048\n-s 720x480 -pixfmt yuv420p -r 24000/1001\n-codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008\n-ar 48000\n-codec:a ac3 -b:a 448k\n\nDV\n\n:\n-f dv\n-s 720x576 -pixfmt yuv420p -r 25\n-ar 48000 -ac 2\n\n:\n-f dv\n-s 720x480 -pixfmt yuv411p -r 30000/1001\n-ar 48000 -ac 2\n\n:\n-f dv\n-s 720x480 -pixfmt yuv411p -r 24000/1001\n-ar 48000 -ac 2\n\nThe \"dv50\" target is identical to the \"dv\" target except that the pixel format set is\n\"yuv422p\" for all three standards.\n\nAny user-set value for a parameter above will override the target preset value. In that\ncase, the output may not comply with the target standard.\n" }, { "name": "-dn (_", "content": "As an input option, blocks all data streams of a file from being filtered or being\nautomatically selected or mapped for any output. See \"-discard\" option to disable streams\nindividually.\n\nAs an output option, disables data recording i.e. automatic selection or mapping of any\ndata stream. For full manual control see the \"-map\" option.\n" }, { "name": "-dframes _", "content": "Set the number of data frames to output. This is an obsolete alias for \"-frames:d\", which\nyou should use instead.\n" }, { "name": "-frames[:_", "content": "Stop writing to the stream after framecount frames.\n" }, { "name": "-q[:_", "content": "" }, { "name": "-qscale[:_", "content": "Use fixed quality scale (VBR). The meaning of q/qscale is codec-dependent. If qscale is\nused without a streamspecifier then it applies only to the video stream, this is to\nmaintain compatibility with previous behavior and as specifying the same codec specific\nvalue to 2 different codecs that is audio and video generally is not what is intended\nwhen no streamspecifier is used.\n" }, { "name": "-filter[:_", "content": "Create the filtergraph specified by filtergraph and use it to filter the stream.\n\nfiltergraph is a description of the filtergraph to apply to the stream, and must have a\nsingle input and a single output of the same type of the stream. In the filtergraph, the\ninput is associated to the label \"in\", and the output to the label \"out\". See the ffmpeg-\nfilters manual for more information about the filtergraph syntax.\n\nSee the -filtercomplex option if you want to create filtergraphs with multiple inputs\nand/or outputs.\n" }, { "name": "-filter_script[:_", "content": "This option is similar to -filter, the only difference is that its argument is the name\nof the file from which a filtergraph description is to be read.\n" }, { "name": "-reinit_filter[:_", "content": "This boolean option determines if the filtergraph(s) to which this stream is fed gets\nreinitialized when input frame parameters change mid-stream. This option is enabled by\ndefault as most video and all audio filters cannot handle deviation in input frame\nproperties. Upon reinitialization, existing filter state is lost, like e.g. the frame\ncount \"n\" reference available in some filters. Any frames buffered at time of\nreinitialization are lost. The properties where a change triggers reinitialization are,\nfor video, frame resolution or pixel format; for audio, sample format, sample rate,\nchannel count or channel layout.\n" }, { "name": "-filter_threads _", "content": "Defines how many threads are used to process a filter pipeline. Each pipeline will\nproduce a thread pool with this many threads available for parallel processing. The\ndefault is the number of available CPUs.\n" }, { "name": "-pre[:_", "content": "Specify the preset for matching stream(s).\n" }, { "name": "-stats (_", "content": "Print encoding progress/statistics. It is on by default, to explicitly disable it you\nneed to specify \"-nostats\".\n" }, { "name": "-stats_period _", "content": "Set period at which encoding progress/statistics are updated. Default is 0.5 seconds.\n" }, { "name": "-progress _", "content": "Send program-friendly progress information to url.\n\nProgress information is written periodically and at the end of the encoding process. It\nis made of \"key=value\" lines. key consists of only alphanumeric characters. The last key\nof a sequence of progress information is always \"progress\".\n\nThe update period is set using \"-statsperiod\".\n" }, { "name": "-stdin", "content": "Enable interaction on standard input. On by default unless standard input is used as an\ninput. To explicitly disable interaction you need to specify \"-nostdin\".\n\nDisabling interaction on standard input is useful, for example, if ffmpeg is in the\nbackground process group. Roughly the same result can be achieved with \"ffmpeg ... <\n/dev/null\" but it requires a shell.\n" }, { "name": "-debug_ts (_", "content": "Print timestamp information. It is off by default. This option is mostly useful for\ntesting and debugging purposes, and the output format may change from one version to\nanother, so it should not be employed by portable scripts.\n\nSee also the option \"-fdebug ts\".\n" }, { "name": "-attach _", "content": "Add an attachment to the output file. This is supported by a few formats like Matroska\nfor e.g. fonts used in rendering subtitles. Attachments are implemented as a specific\ntype of stream, so this option will add a new stream to the file. It is then possible to\nuse per-stream options on this stream in the usual way. Attachment streams created with\nthis option will be created after all the other streams (i.e. those created with \"-map\"\nor automatic mappings).\n\nNote that for Matroska you also have to set the mimetype metadata tag:\n\nffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv\n\n(assuming that the attachment stream will be third in the output file).\n" }, { "name": "-dump_attachment[:_", "content": "Extract the matching attachment stream into a file named filename. If filename is empty,\nthen the value of the \"filename\" metadata tag will be used.\n\nE.g. to extract the first attachment to a file named 'out.ttf':\n\nffmpeg -dumpattachment:t:0 out.ttf -i INPUT\n\nTo extract all attachments to files determined by the \"filename\" tag:\n\nffmpeg -dumpattachment:t \"\" -i INPUT\n\nTechnical note -- attachments are implemented as codec extradata, so this option can\nactually be used to extract extradata from any stream, not just attachments.\n" }, { "name": "Video Options", "content": "" }, { "name": "-vframes _", "content": "Set the number of video frames to output. This is an obsolete alias for \"-frames:v\",\nwhich you should use instead.\n" }, { "name": "-r[:_", "content": "Set frame rate (Hz value, fraction or abbreviation).\n\nAs an input option, ignore any timestamps stored in the file and instead generate\ntimestamps assuming constant frame rate fps. This is not the same as the -framerate\noption used for some input formats like image2 or v4l2 (it used to be the same in older\nversions of FFmpeg). If in doubt use -framerate instead of the input option -r.\n\nAs an output option:\n\nvideo encoding\nDuplicate or drop frames right before encoding them to achieve constant output frame\nrate fps.\n\nvideo streamcopy\nIndicate to the muxer that fps is the stream frame rate. No data is dropped or\nduplicated in this case. This may produce invalid files if fps does not match the\nactual stream frame rate as determined by packet timestamps. See also the \"setts\"\nbitstream filter.\n" }, { "name": "-fpsmax[:_", "content": "Set maximum frame rate (Hz value, fraction or abbreviation).\n\nClamps output frame rate when output framerate is auto-set and is higher than this value.\nUseful in batch processing or when input framerate is wrongly detected as very high. It\ncannot be set together with \"-r\". It is ignored during streamcopy.\n" }, { "name": "-s[:_", "content": "Set frame size.\n\nAs an input option, this is a shortcut for the videosize private option, recognized by\nsome demuxers for which the frame size is either not stored in the file or is\nconfigurable -- e.g. raw video or video grabbers.\n\nAs an output option, this inserts the \"scale\" video filter to the end of the\ncorresponding filtergraph. Please use the \"scale\" filter directly to insert it at the\nbeginning or some other place.\n\nThe format is wxh (default - same as source).\n" }, { "name": "-aspect[:_", "content": "Set the video display aspect ratio specified by aspect.\n\naspect can be a floating point number string, or a string of the form num:den, where num\nand den are the numerator and denominator of the aspect ratio. For example \"4:3\", \"16:9\",\n\"1.3333\", and \"1.7777\" are valid argument values.\n\nIf used together with -vcodec copy, it will affect the aspect ratio stored at container\nlevel, but not the aspect ratio stored in encoded frames, if it exists.\n" }, { "name": "-display_rotation[:_", "content": "Set video rotation metadata.\n\nrotation is a decimal number specifying the amount in degree by which the video should be\nrotated counter-clockwise before being displayed.\n\nThis option overrides the rotation/display transform metadata stored in the file, if any.\nWhen the video is being transcoded (rather than copied) and \"-autorotate\" is enabled, the\nvideo will be rotated at the filtering stage. Otherwise, the metadata will be written\ninto the output file if the muxer supports it.\n\nIf the \"-displayhflip\" and/or \"-displayvflip\" options are given, they are applied after\nthe rotation specified by this option.\n" }, { "name": "-display_hflip[:_", "content": "Set whether on display the image should be horizontally flipped.\n\nSee the \"-displayrotation\" option for more details.\n" }, { "name": "-display_vflip[:_", "content": "Set whether on display the image should be vertically flipped.\n\nSee the \"-displayrotation\" option for more details.\n" }, { "name": "-vn (_", "content": "As an input option, blocks all video streams of a file from being filtered or being\nautomatically selected or mapped for any output. See \"-discard\" option to disable streams\nindividually.\n\nAs an output option, disables video recording i.e. automatic selection or mapping of any\nvideo stream. For full manual control see the \"-map\" option.\n" }, { "name": "-vcodec _", "content": "Set the video codec. This is an alias for \"-codec:v\".\n" }, { "name": "-pass[:_", "content": "Select the pass number (1 or 2). It is used to do two-pass video encoding. The statistics\nof the video are recorded in the first pass into a log file (see also the option\n-passlogfile), and in the second pass that log file is used to generate the video at the\nexact requested bitrate. On pass 1, you may just deactivate audio and set output to\nnull, examples for Windows and Unix:\n\nffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL\nffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null\n" }, { "name": "-passlogfile[:_", "content": "Set two-pass log file name prefix to prefix, the default file name prefix is\n``ffmpeg2pass''. The complete file name will be PREFIX-N.log, where N is a number\nspecific to the output stream\n" }, { "name": "-vf _", "content": "Create the filtergraph specified by filtergraph and use it to filter the stream.\n\nThis is an alias for \"-filter:v\", see the -filter option.\n" }, { "name": "-autorotate", "content": "Automatically rotate the video according to file metadata. Enabled by default, use\n-noautorotate to disable it.\n" }, { "name": "-autoscale", "content": "Automatically scale the video according to the resolution of first frame. Enabled by\ndefault, use -noautoscale to disable it. When autoscale is disabled, all output frames of\nfilter graph might not be in the same resolution and may be inadequate for some\nencoder/muxer. Therefore, it is not recommended to disable it unless you really know what\nyou are doing. Disable autoscale at your own risk.\n" }, { "name": "Advanced Video options", "content": "" }, { "name": "-pix_fmt[:_", "content": "Set pixel format. Use \"-pixfmts\" to show all the supported pixel formats. If the\nselected pixel format can not be selected, ffmpeg will print a warning and select the\nbest pixel format supported by the encoder. If pixfmt is prefixed by a \"+\", ffmpeg will\nexit with an error if the requested pixel format can not be selected, and automatic\nconversions inside filtergraphs are disabled. If pixfmt is a single \"+\", ffmpeg selects\nthe same pixel format as the input (or graph output) and automatic conversions are\ndisabled.\n" }, { "name": "-sws_flags _", "content": "Set default flags for the libswscale library. These flags are used by automatically\ninserted \"scale\" filters and those within simple filtergraphs, if not overridden within\nthe filtergraph definition.\n\nSee the ffmpeg-scaler manual for a list of scaler options.\n" }, { "name": "-rc_override[:_", "content": "Rate control override for specific intervals, formatted as \"int,int,int\" list separated\nwith slashes. Two first values are the beginning and end frame numbers, last one is\nquantizer to use if positive, or quality factor if negative.\n" }, { "name": "-psnr", "content": "Calculate PSNR of compressed frames. This option is deprecated, pass the PSNR flag to the\nencoder instead, using \"-flags +psnr\".\n" }, { "name": "-vstats", "content": "Dump video coding statistics to vstatsHHMMSS.log. See the vstats file format section for\nthe format description.\n" }, { "name": "-vstats_file _", "content": "Dump video coding statistics to file. See the vstats file format section for the format\ndescription.\n" }, { "name": "-vstats_version _", "content": "Specify which version of the vstats format to use. Default is 2. See the vstats file\nformat section for the format description.\n" }, { "name": "-vtag _", "content": "Force video tag/fourcc. This is an alias for \"-tag:v\".\n" }, { "name": "-vbsf _", "content": "Deprecated see -bsf\n" }, { "name": "-force_key_frames[:_", "content": "" }, { "name": "-force_key_frames[:_", "content": "" }, { "name": "-force_key_frames[:_", "content": "forcekeyframes can take arguments of the following form:\n\ntime[,time...]\nIf the argument consists of timestamps, ffmpeg will round the specified times to the\nnearest output timestamp as per the encoder time base and force a keyframe at the\nfirst frame having timestamp equal or greater than the computed timestamp. Note that\nif the encoder time base is too coarse, then the keyframes may be forced on frames\nwith timestamps lower than the specified time. The default encoder time base is the\ninverse of the output framerate but may be set otherwise via \"-enctimebase\".\n\nIf one of the times is \"\"chapters\"[delta]\", it is expanded into the time of the\nbeginning of all chapters in the file, shifted by delta, expressed as a time in\nseconds. This option can be useful to ensure that a seek point is present at a\nchapter mark or any other designated place in the output file.\n\nFor example, to insert a key frame at 5 minutes, plus key frames 0.1 second before\nthe beginning of every chapter:\n\n-forcekeyframes 0:05:00,chapters-0.1\n\nexpr:expr\nIf the argument is prefixed with \"expr:\", the string expr is interpreted like an\nexpression and is evaluated for each frame. A key frame is forced in case the\nevaluation is non-zero.\n\nThe expression in expr can contain the following constants:\n\nn the number of current processed frame, starting from 0\n\nnforced\nthe number of forced frames\n\nprevforcedn\nthe number of the previous forced frame, it is \"NAN\" when no keyframe was forced\nyet\n\nprevforcedt\nthe time of the previous forced frame, it is \"NAN\" when no keyframe was forced\nyet\n\nt the time of the current processed frame\n\nFor example to force a key frame every 5 seconds, you can specify:\n\n-forcekeyframes expr:gte(t,nforced*5)\n\nTo force a key frame 5 seconds after the time of the last forced one, starting from\nsecond 13:\n\n-forcekeyframes expr:if(isnan(prevforcedt),gte(t,13),gte(t,prevforcedt+5))\n\nsource\nIf the argument is \"source\", ffmpeg will force a key frame if the current frame being\nencoded is marked as a key frame in its source. In cases where this particular\nsource frame has to be dropped, enforce the next available frame to become a key\nframe instead.\n\nNote that forcing too many keyframes is very harmful for the lookahead algorithms of\ncertain encoders: using fixed-GOP options or similar would be more efficient.\n" }, { "name": "-copyinkf[:_", "content": "When doing stream copy, copy also non-key frames found at the beginning.\n" }, { "name": "-init_hw_device _", "content": "Initialise a new hardware device of type type called name, using the given device\nparameters. If no name is specified it will receive a default name of the form \"type%d\".\n\nThe meaning of device and the following arguments depends on the device type:\n\ncuda\ndevice is the number of the CUDA device.\n\nThe following options are recognized:\n\nprimaryctx\nIf set to 1, uses the primary device context instead of creating a new one.\n\nExamples:\n\n-inithwdevice cuda:1\nChoose the second device on the system.\n\n-inithwdevice cuda:0,primaryctx=1\nChoose the first device and use the primary device context.\n\ndxva2\ndevice is the number of the Direct3D 9 display adapter.\n\nd3d11va\ndevice is the number of the Direct3D 11 display adapter.\n\nvaapi\ndevice is either an X11 display name, a DRM render node or a DirectX adapter index.\nIf not specified, it will attempt to open the default X11 display ($DISPLAY) and then\nthe first DRM render node (/dev/dri/renderD128), or the default DirectX adapter on\nWindows.\n\nvdpau\ndevice is an X11 display name. If not specified, it will attempt to open the default\nX11 display ($DISPLAY).\n\nqsv device selects a value in MFXIMPL*. Allowed values are:\n\nauto\nsw\nhw\nautoany\nhwany\nhw2\nhw3\nhw4\n\nIf not specified, autoany is used. (Note that it may be easier to achieve the\ndesired result for QSV by creating the platform-appropriate subdevice (dxva2 or\nd3d11va or vaapi) and then deriving a QSV device from that.)\n\nAlternatively, childdevicetype helps to choose platform-appropriate subdevice type.\nOn Windows d3d11va is used as default subdevice type.\n\nExamples:\n\n-inithwdevice qsv:hw,childdevicetype=d3d11va\nChoose the GPU subdevice with type d3d11va and create QSV device with\nMFXIMPLHARDWARE.\n\n-inithwdevice qsv:hw,childdevicetype=dxva2\nChoose the GPU subdevice with type dxva2 and create QSV device with\nMFXIMPLHARDWARE.\n\nopencl\ndevice selects the platform and device as platformindex.deviceindex.\n\nThe set of devices can also be filtered using the key-value pairs to find only\ndevices matching particular platform or device strings.\n\nThe strings usable as filters are:\n\nplatformprofile\nplatformversion\nplatformname\nplatformvendor\nplatformextensions\ndevicename\ndevicevendor\ndriverversion\ndeviceversion\ndeviceprofile\ndeviceextensions\ndevicetype\n\nThe indices and filters must together uniquely select a device.\n\nExamples:\n\n-inithwdevice opencl:0.1\nChoose the second device on the first platform.\n\n-inithwdevice opencl:,devicename=Foo9000\nChoose the device with a name containing the string Foo9000.\n\n-inithwdevice opencl:1,devicetype=gpu,deviceextensions=clkhrfp16\nChoose the GPU device on the second platform supporting the clkhrfp16\nextension.\n\nvulkan\nIf device is an integer, it selects the device by its index in a system-dependent\nlist of devices. If device is any other string, it selects the first device with a\nname containing that string as a substring.\n\nThe following options are recognized:\n\ndebug\nIf set to 1, enables the validation layer, if installed.\n\nlinearimages\nIf set to 1, images allocated by the hwcontext will be linear and locally\nmappable.\n\ninstanceextensions\nA plus separated list of additional instance extensions to enable.\n\ndeviceextensions\nA plus separated list of additional device extensions to enable.\n\nExamples:\n\n-inithwdevice vulkan:1\nChoose the second device on the system.\n\n-inithwdevice vulkan:RADV\nChoose the first device with a name containing the string RADV.\n\n-inithwdevice\nvulkan:0,instanceextensions=VKKHRwaylandsurface+VKKHRxcbsurface\nChoose the first device and enable the Wayland and XCB instance extensions.\n" }, { "name": "-init_hw_device _", "content": "Initialise a new hardware device of type type called name, deriving it from the existing\ndevice with the name source.\n" }, { "name": "-init_hw_device list", "content": "List all hardware device types supported in this build of ffmpeg.\n" }, { "name": "-filter_hw_device _", "content": "Pass the hardware device called name to all filters in any filter graph. This can be\nused to set the device to upload to with the \"hwupload\" filter, or the device to map to\nwith the \"hwmap\" filter. Other filters may also make use of this parameter when they\nrequire a hardware device. Note that this is typically only required when the input is\nnot already in hardware frames - when it is, filters will derive the device they require\nfrom the context of the frames they receive as input.\n\nThis is a global setting, so all filters will receive the same device.\n" }, { "name": "-hwaccel[:_", "content": "Use hardware acceleration to decode the matching stream(s). The allowed values of hwaccel\nare:\n\nnone\nDo not use any hardware acceleration (the default).\n\nauto\nAutomatically select the hardware acceleration method.\n\nvdpau\nUse VDPAU (Video Decode and Presentation API for Unix) hardware acceleration.\n\ndxva2\nUse DXVA2 (DirectX Video Acceleration) hardware acceleration.\n\nd3d11va\nUse D3D11VA (DirectX Video Acceleration) hardware acceleration.\n\nvaapi\nUse VAAPI (Video Acceleration API) hardware acceleration.\n\nqsv Use the Intel QuickSync Video acceleration for video transcoding.\n\nUnlike most other values, this option does not enable accelerated decoding (that is\nused automatically whenever a qsv decoder is selected), but accelerated transcoding,\nwithout copying the frames into the system memory.\n\nFor it to work, both the decoder and the encoder must support QSV acceleration and no\nfilters must be used.\n\nThis option has no effect if the selected hwaccel is not available or not supported by\nthe chosen decoder.\n\nNote that most acceleration methods are intended for playback and will not be faster than\nsoftware decoding on modern CPUs. Additionally, ffmpeg will usually need to copy the\ndecoded frames from the GPU memory into the system memory, resulting in further\nperformance loss. This option is thus mainly useful for testing.\n" }, { "name": "-hwaccel_device[:_", "content": "Select a device to use for hardware acceleration.\n\nThis option only makes sense when the -hwaccel option is also specified. It can either\nrefer to an existing device created with -inithwdevice by name, or it can create a new\ndevice as if -inithwdevice type:hwacceldevice were called immediately before.\n" }, { "name": "-hwaccels", "content": "List all hardware acceleration components enabled in this build of ffmpeg. Actual\nruntime availability depends on the hardware and its suitable driver being installed.\n" }, { "name": "-fix_sub_duration_heartbeat[:_", "content": "Set a specific output video stream as the heartbeat stream according to which to split\nand push through currently in-progress subtitle upon receipt of a random access packet.\n\nThis lowers the latency of subtitles for which the end packet or the following subtitle\nhas not yet been received. As a drawback, this will most likely lead to duplication of\nsubtitle events in order to cover the full duration, so when dealing with use cases where\nlatency of when the subtitle event is passed on to output is not relevant this option\nshould not be utilized.\n\nRequires -fixsubduration to be set for the relevant input subtitle stream for this to\nhave any effect, as well as for the input subtitle stream having to be directly mapped to\nthe same output in which the heartbeat stream resides.\n" }, { "name": "Audio Options", "content": "" }, { "name": "-aframes _", "content": "Set the number of audio frames to output. This is an obsolete alias for \"-frames:a\",\nwhich you should use instead.\n" }, { "name": "-ar[:_", "content": "Set the audio sampling frequency. For output streams it is set by default to the\nfrequency of the corresponding input stream. For input streams this option only makes\nsense for audio grabbing devices and raw demuxers and is mapped to the corresponding\ndemuxer options.\n" }, { "name": "-aq _", "content": "Set the audio quality (codec-specific, VBR). This is an alias for -q:a.\n" }, { "name": "-ac[:_", "content": "Set the number of audio channels. For output streams it is set by default to the number\nof input audio channels. For input streams this option only makes sense for audio\ngrabbing devices and raw demuxers and is mapped to the corresponding demuxer options.\n" }, { "name": "-an (_", "content": "As an input option, blocks all audio streams of a file from being filtered or being\nautomatically selected or mapped for any output. See \"-discard\" option to disable streams\nindividually.\n\nAs an output option, disables audio recording i.e. automatic selection or mapping of any\naudio stream. For full manual control see the \"-map\" option.\n" }, { "name": "-acodec _", "content": "Set the audio codec. This is an alias for \"-codec:a\".\n" }, { "name": "-sample_fmt[:_", "content": "Set the audio sample format. Use \"-samplefmts\" to get a list of supported sample\nformats.\n" }, { "name": "-af _", "content": "Create the filtergraph specified by filtergraph and use it to filter the stream.\n\nThis is an alias for \"-filter:a\", see the -filter option.\n" }, { "name": "Advanced Audio options", "content": "" }, { "name": "-atag _", "content": "Force audio tag/fourcc. This is an alias for \"-tag:a\".\n" }, { "name": "-absf _", "content": "Deprecated, see -bsf\n" }, { "name": "-guess_layout_max _", "content": "If some input channel layout is not known, try to guess only if it corresponds to at most\nthe specified number of channels. For example, 2 tells to ffmpeg to recognize 1 channel\nas mono and 2 channels as stereo but not 6 channels as 5.1. The default is to always try\nto guess. Use 0 to disable all guessing.\n" }, { "name": "Subtitle options", "content": "" }, { "name": "-scodec _", "content": "Set the subtitle codec. This is an alias for \"-codec:s\".\n" }, { "name": "-sn (_", "content": "As an input option, blocks all subtitle streams of a file from being filtered or being\nautomatically selected or mapped for any output. See \"-discard\" option to disable streams\nindividually.\n\nAs an output option, disables subtitle recording i.e. automatic selection or mapping of\nany subtitle stream. For full manual control see the \"-map\" option.\n" }, { "name": "-sbsf _", "content": "Deprecated, see -bsf\n" }, { "name": "Advanced Subtitle options", "content": "" }, { "name": "-fix_sub_duration", "content": "Fix subtitles durations. For each subtitle, wait for the next packet in the same stream\nand adjust the duration of the first to avoid overlap. This is necessary with some\nsubtitles codecs, especially DVB subtitles, because the duration in the original packet\nis only a rough estimate and the end is actually marked by an empty subtitle frame.\nFailing to use this option when necessary can result in exaggerated durations or muxing\nfailures due to non-monotonic timestamps.\n\nNote that this option will delay the output of all data until the next subtitle packet is\ndecoded: it may increase memory consumption and latency a lot.\n" }, { "name": "-canvas_size _", "content": "Set the size of the canvas used to render subtitles.\n" }, { "name": "Advanced options", "content": "" }, { "name": "-map [-]_", "content": "Create one or more streams in the output file. This option has two forms for specifying\nthe data source(s): the first selects one or more streams from some input file (specified\nwith \"-i\"), the second takes an output from some complex filtergraph (specified with\n\"-filtercomplex\" or \"-filtercomplexscript\").\n\nIn the first form, an output stream is created for every stream from the input file with\nthe index inputfileid. If streamspecifier is given, only those streams that match the\nspecifier are used (see the Stream specifiers section for the streamspecifier syntax).\n\nA \"-\" character before the stream identifier creates a \"negative\" mapping. It disables\nmatching streams from already created mappings.\n\nA trailing \"?\" after the stream index will allow the map to be optional: if the map\nmatches no streams the map will be ignored instead of failing. Note the map will still\nfail if an invalid input file index is used; such as if the map refers to a non-existent\ninput.\n\nAn alternative [linklabel] form will map outputs from complex filter graphs (see the\n-filtercomplex option) to the output file. linklabel must correspond to a defined\noutput link label in the graph.\n\nThis option may be specified multiple times, each adding more streams to the output file.\nAny given input stream may also be mapped any number of times as a source for different\noutput streams, e.g. in order to use different encoding options and/or filters. The\nstreams are created in the output in the same order in which the \"-map\" options are given\non the commandline.\n\nUsing this option disables the default mappings for this output file.\n\nExamples:\n\nmap everything\nTo map ALL streams from the first input file to output\n\nffmpeg -i INPUT -map 0 output\n\nselect specific stream\nIf you have two audio streams in the first input file, these streams are identified\nby 0:0 and 0:1. You can use \"-map\" to select which streams to place in an output\nfile. For example:\n\nffmpeg -i INPUT -map 0:1 out.wav\n\nwill map the second input stream in INPUT to the (single) output stream in out.wav.\n\ncreate multiple streams\nTo select the stream with index 2 from input file a.mov (specified by the identifier\n0:2), and stream with index 6 from input b.mov (specified by the identifier 1:6), and\ncopy them to the output file out.mov:\n\nffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov\n\ncreate multiple streams 2\nTo select all video and the third audio stream from an input file:\n\nffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT\n\nnegative map\nTo map all the streams except the second audio, use negative mappings\n\nffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT\n\noptional map\nTo map the video and audio streams from the first input, and using the trailing \"?\",\nignore the audio mapping if no audio streams exist in the first input:\n\nffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT\n\nmap by language\nTo pick the English audio stream:\n\nffmpeg -i INPUT -map 0:m:language:eng OUTPUT\n" }, { "name": "-ignore_unknown", "content": "Ignore input streams with unknown type instead of failing if copying such streams is\nattempted.\n" }, { "name": "-copy_unknown", "content": "Allow input streams with unknown type to be copied instead of failing if copying such\nstreams is attempted.\n" }, { "name": "-map_channel", "content": "[inputfileid.streamspecifier.channelid|-1][?][:outputfileid.streamspecifier]\nThis option is deprecated and will be removed. It can be replaced by the pan filter. In\nsome cases it may be easier to use some combination of the channelsplit, channelmap, or\namerge filters.\n\nMap an audio channel from a given input to an output. If outputfileid.streamspecifier\nis not set, the audio channel will be mapped on all the audio streams.\n\nUsing \"-1\" instead of inputfileid.streamspecifier.channelid will map a muted channel.\n\nA trailing \"?\" will allow the mapchannel to be optional: if the mapchannel matches no\nchannel the mapchannel will be ignored instead of failing.\n\nFor example, assuming INPUT is a stereo audio file, you can switch the two audio channels\nwith the following command:\n\nffmpeg -i INPUT -mapchannel 0.0.1 -mapchannel 0.0.0 OUTPUT\n\nIf you want to mute the first channel and keep the second:\n\nffmpeg -i INPUT -mapchannel -1 -mapchannel 0.0.1 OUTPUT\n\nThe order of the \"-mapchannel\" option specifies the order of the channels in the output\nstream. The output channel layout is guessed from the number of channels mapped (mono if\none \"-mapchannel\", stereo if two, etc.). Using \"-ac\" in combination of \"-mapchannel\"\nmakes the channel gain levels to be updated if input and output channel layouts don't\nmatch (for instance two \"-mapchannel\" options and \"-ac 6\").\n\nYou can also extract each channel of an input to specific outputs; the following command\nextracts two channels of the INPUT audio stream (file 0, stream 0) to the respective\nOUTPUTCH0 and OUTPUTCH1 outputs:\n\nffmpeg -i INPUT -mapchannel 0.0.0 OUTPUTCH0 -mapchannel 0.0.1 OUTPUTCH1\n\nThe following example splits the channels of a stereo input into two separate streams,\nwhich are put into the same output file:\n\nffmpeg -i stereo.wav -map 0:0 -map 0:0 -mapchannel 0.0.0:0.0 -mapchannel 0.0.1:0.1 -y out.ogg\n\nNote that currently each output stream can only contain channels from a single input\nstream; you can't for example use \"-mapchannel\" to pick multiple input audio channels\ncontained in different streams (from the same or different files) and merge them into a\nsingle output stream. It is therefore not currently possible, for example, to turn two\nseparate mono streams into a single stereo stream. However splitting a stereo stream into\ntwo single channel mono streams is possible.\n\nIf you need this feature, a possible workaround is to use the amerge filter. For example,\nif you need to merge a media (here input.mkv) with 2 mono audio streams into one single\nstereo channel audio stream (and keep the video stream), you can use the following\ncommand:\n\nffmpeg -i input.mkv -filtercomplex \"[0:1] [0:2] amerge\" -c:a pcms16le -c:v copy output.mkv\n\nTo map the first two audio channels from the first input, and using the trailing \"?\",\nignore the audio channel mapping if the first input is mono instead of stereo:\n\nffmpeg -i INPUT -mapchannel 0.0.0 -mapchannel 0.0.1? OUTPUT\n" }, { "name": "-map_metadata[:_", "content": "Set metadata information of the next output file from infile. Note that those are file\nindices (zero-based), not filenames. Optional metadataspecin/out parameters specify,\nwhich metadata to copy. A metadata specifier can have the following forms:\n\ng global metadata, i.e. metadata that applies to the whole file\n\ns[:streamspec]\nper-stream metadata. streamspec is a stream specifier as described in the Stream\nspecifiers chapter. In an input metadata specifier, the first matching stream is\ncopied from. In an output metadata specifier, all matching streams are copied to.\n\nc:chapterindex\nper-chapter metadata. chapterindex is the zero-based chapter index.\n\np:programindex\nper-program metadata. programindex is the zero-based program index.\n\nIf metadata specifier is omitted, it defaults to global.\n\nBy default, global metadata is copied from the first input file, per-stream and per-\nchapter metadata is copied along with streams/chapters. These default mappings are\ndisabled by creating any mapping of the relevant type. A negative file index can be used\nto create a dummy mapping that just disables automatic copying.\n\nFor example to copy metadata from the first stream of the input file to global metadata\nof the output file:\n\nffmpeg -i in.ogg -mapmetadata 0:s:0 out.mp3\n\nTo do the reverse, i.e. copy global metadata to all audio streams:\n\nffmpeg -i in.mkv -mapmetadata:s:a 0:g out.mkv\n\nNote that simple 0 would work as well in this example, since global metadata is assumed\nby default.\n" }, { "name": "-map_chapters _", "content": "Copy chapters from input file with index inputfileindex to the next output file. If no\nchapter mapping is specified, then chapters are copied from the first input file with at\nleast one chapter. Use a negative file index to disable any chapter copying.\n" }, { "name": "-benchmark (_", "content": "Show benchmarking information at the end of an encode. Shows real, system and user time\nused and maximum memory consumption. Maximum memory consumption is not supported on all\nsystems, it will usually display as 0 if not supported.\n" }, { "name": "-benchmark_all (_", "content": "Show benchmarking information during the encode. Shows real, system and user time used\nin various steps (audio/video encode/decode).\n" }, { "name": "-timelimit _", "content": "Exit after ffmpeg has been running for duration seconds in CPU user time.\n" }, { "name": "-dump (_", "content": "Dump each input packet to stderr.\n" }, { "name": "-hex (_", "content": "When dumping packets, also dump the payload.\n" }, { "name": "-readrate _", "content": "Limit input read speed.\n\nIts value is a floating-point positive number which represents the maximum duration of\nmedia, in seconds, that should be ingested in one second of wallclock time. Default\nvalue is zero and represents no imposed limitation on speed of ingestion. Value 1\nrepresents real-time speed and is equivalent to \"-re\".\n\nMainly used to simulate a capture device or live input stream (e.g. when reading from a\nfile). Should not be used with a low value when input is an actual capture device or\nlive stream as it may cause packet loss.\n\nIt is useful for when flow speed of output packets is important, such as live streaming.\n" }, { "name": "-re (_", "content": "Read input at native frame rate. This is equivalent to setting \"-readrate 1\".\n" }, { "name": "-readrate_initial_burst _", "content": "Set an initial read burst time, in seconds, after which -re/-readrate will be enforced.\n" }, { "name": "-vsync _", "content": "" }, { "name": "-fps_mode[:_", "content": "Set video sync method / framerate mode. vsync is applied to all output video streams but\ncan be overridden for a stream by setting fpsmode. vsync is deprecated and will be\nremoved in the future.\n\nFor compatibility reasons some of the values for vsync can be specified as numbers (shown\nin parentheses in the following table).\n\npassthrough (0)\nEach frame is passed with its timestamp from the demuxer to the muxer.\n\ncfr (1)\nFrames will be duplicated and dropped to achieve exactly the requested constant frame\nrate.\n\nvfr (2)\nFrames are passed through with their timestamp or dropped so as to prevent 2 frames\nfrom having the same timestamp.\n\ndrop\nAs passthrough but destroys all timestamps, making the muxer generate fresh\ntimestamps based on frame-rate.\n\nauto (-1)\nChooses between cfr and vfr depending on muxer capabilities. This is the default\nmethod.\n\nNote that the timestamps may be further modified by the muxer, after this. For example,\nin the case that the format option avoidnegativets is enabled.\n\nWith -map you can select from which stream the timestamps should be taken. You can leave\neither video or audio unchanged and sync the remaining stream(s) to the unchanged one.\n" }, { "name": "-frame_drop_threshold _", "content": "Frame drop threshold, which specifies how much behind video frames can be before they are\ndropped. In frame rate units, so 1.0 is one frame. The default is -1.1. One possible\nusecase is to avoid framedrops in case of noisy timestamps or to increase frame drop\nprecision in case of exact timestamps.\n" }, { "name": "-apad _", "content": "Pad the output audio stream(s). This is the same as applying \"-af apad\". Argument is a\nstring of filter parameters composed the same as with the \"apad\" filter. \"-shortest\"\nmust be set for this output for the option to take effect.\n" }, { "name": "-copyts", "content": "Do not process input timestamps, but keep their values without trying to sanitize them.\nIn particular, do not remove the initial start time offset value.\n\nNote that, depending on the vsync option or on specific muxer processing (e.g. in case\nthe format option avoidnegativets is enabled) the output timestamps may mismatch with\nthe input timestamps even when this option is selected.\n" }, { "name": "-start_at_zero", "content": "When used with copyts, shift input timestamps so they start at zero.\n\nThis means that using e.g. \"-ss 50\" will make output timestamps start at 50 seconds,\nregardless of what timestamp the input file started at.\n" }, { "name": "-copytb _", "content": "Specify how to set the encoder timebase when stream copying. mode is an integer numeric\nvalue, and can assume one of the following values:\n\n1 Use the demuxer timebase.\n\nThe time base is copied to the output encoder from the corresponding input demuxer.\nThis is sometimes required to avoid non monotonically increasing timestamps when\ncopying video streams with variable frame rate.\n\n0 Use the decoder timebase.\n\nThe time base is copied to the output encoder from the corresponding input decoder.\n\n-1 Try to make the choice automatically, in order to generate a sane output.\n\nDefault value is -1.\n" }, { "name": "-enc_time_base[:_", "content": "Set the encoder timebase. timebase can assume one of the following values:\n\n0 Assign a default value according to the media type.\n\nFor video - use 1/framerate, for audio - use 1/samplerate.\n\ndemux\nUse the timebase from the demuxer.\n\nfilter\nUse the timebase from the filtergraph.\n\na positive number\nUse the provided number as the timebase.\n\nThis field can be provided as a ratio of two integers (e.g. 1:24, 1:48000) or as a\ndecimal number (e.g. 0.04166, 2.0833e-5)\n\nDefault value is 0.\n" }, { "name": "-bitexact (_", "content": "Enable bitexact mode for (de)muxer and (de/en)coder\n" }, { "name": "-shortest (_", "content": "Finish encoding when the shortest output stream ends.\n\nNote that this option may require buffering frames, which introduces extra latency. The\nmaximum amount of this latency may be controlled with the \"-shortestbufduration\"\noption.\n" }, { "name": "-shortest_buf_duration _", "content": "The \"-shortest\" option may require buffering potentially large amounts of data when at\nleast one of the streams is \"sparse\" (i.e. has large gaps between frames – this is\ntypically the case for subtitles).\n\nThis option controls the maximum duration of buffered frames in seconds. Larger values\nmay allow the \"-shortest\" option to produce more accurate results, but increase memory\nuse and latency.\n\nThe default value is 10 seconds.\n" }, { "name": "-dts_delta_threshold _", "content": "Timestamp discontinuity delta threshold, expressed as a decimal number of seconds.\n\nThe timestamp discontinuity correction enabled by this option is only applied to input\nformats accepting timestamp discontinuity (for which the \"AVFMTDISCONT\" flag is\nenabled), e.g. MPEG-TS and HLS, and is automatically disabled when employing the\n\"-copyts\" option (unless wrapping is detected).\n\nIf a timestamp discontinuity is detected whose absolute value is greater than threshold,\nffmpeg will remove the discontinuity by decreasing/increasing the current DTS and PTS by\nthe corresponding delta value.\n\nThe default value is 10.\n" }, { "name": "-dts_error_threshold _", "content": "Timestamp error delta threshold, expressed as a decimal number of seconds.\n\nThe timestamp correction enabled by this option is only applied to input formats not\naccepting timestamp discontinuity (for which the \"AVFMTDISCONT\" flag is not enabled).\n\nIf a timestamp discontinuity is detected whose absolute value is greater than threshold,\nffmpeg will drop the PTS/DTS timestamp value.\n\nThe default value is \"3600*30\" (30 hours), which is arbitrarily picked and quite\nconservative.\n" }, { "name": "-muxdelay _", "content": "Set the maximum demux-decode delay.\n" }, { "name": "-muxpreload _", "content": "Set the initial demux-decode delay.\n" }, { "name": "-streamid _", "content": "Assign a new stream-id value to an output stream. This option should be specified prior\nto the output filename to which it applies. For the situation where multiple output\nfiles exist, a streamid may be reassigned to a different value.\n\nFor example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for an output\nmpegts file:\n\nffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts\n" }, { "name": "-bsf[:_", "content": "Set bitstream filters for matching streams. bitstreamfilters is a comma-separated list\nof bitstream filters. Use the \"-bsfs\" option to get the list of bitstream filters.\n\nffmpeg -i h264.mp4 -c:v copy -bsf:v h264mp4toannexb -an out.h264\n\n\nffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt\n" }, { "name": "-tag[:_", "content": "Force a tag/fourcc for matching streams.\n" }, { "name": "-timecode _", "content": "Specify Timecode for writing. SEP is ':' for non drop timecode and ';' (or '.') for drop.\n\nffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg\n" }, { "name": "-filter_complex _", "content": "Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or outputs.\nFor simple graphs -- those with one input and one output of the same type -- see the\n-filter options. filtergraph is a description of the filtergraph, as described in the\n``Filtergraph syntax'' section of the ffmpeg-filters manual.\n\nInput link labels must refer to input streams using the \"[fileindex:streamspecifier]\"\nsyntax (i.e. the same as -map uses). If streamspecifier matches multiple streams, the\nfirst one will be used. An unlabeled input will be connected to the first unused input\nstream of the matching type.\n\nOutput link labels are referred to with -map. Unlabeled outputs are added to the first\noutput file.\n\nNote that with this option it is possible to use only lavfi sources without normal input\nfiles.\n\nFor example, to overlay an image over video\n\nffmpeg -i video.mkv -i image.png -filtercomplex '[0:v][1:v]overlay[out]' -map\n'[out]' out.mkv\n\nHere \"[0:v]\" refers to the first video stream in the first input file, which is linked to\nthe first (main) input of the overlay filter. Similarly the first video stream in the\nsecond input is linked to the second (overlay) input of overlay.\n\nAssuming there is only one video stream in each input file, we can omit input labels, so\nthe above is equivalent to\n\nffmpeg -i video.mkv -i image.png -filtercomplex 'overlay[out]' -map\n'[out]' out.mkv\n\nFurthermore we can omit the output label and the single output from the filter graph will\nbe added to the output file automatically, so we can simply write\n\nffmpeg -i video.mkv -i image.png -filtercomplex 'overlay' out.mkv\n\nAs a special exception, you can use a bitmap subtitle stream as input: it will be\nconverted into a video with the same size as the largest video in the file, or 720x576 if\nno video is present. Note that this is an experimental and temporary solution. It will be\nremoved once libavfilter has proper support for subtitles.\n\nFor example, to hardcode subtitles on top of a DVB-T recording stored in MPEG-TS format,\ndelaying the subtitles by 1 second:\n\nffmpeg -i input.ts -filtercomplex \\\n'[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \\\n-sn -map '#0x2dc' output.mkv\n\n(0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video, audio and\nsubtitles streams; 0:0, 0:3 and 0:7 would have worked too)\n\nTo generate 5 seconds of pure red video using lavfi \"color\" source:\n\nffmpeg -filtercomplex 'color=c=red' -t 5 out.mkv\n" }, { "name": "-filter_complex_threads _", "content": "Defines how many threads are used to process a filtercomplex graph. Similar to\nfilterthreads but used for \"-filtercomplex\" graphs only. The default is the number of\navailable CPUs.\n" }, { "name": "-lavfi _", "content": "Define a complex filtergraph, i.e. one with arbitrary number of inputs and/or outputs.\nEquivalent to -filtercomplex.\n" }, { "name": "-filter_complex_script _", "content": "This option is similar to -filtercomplex, the only difference is that its argument is\nthe name of the file from which a complex filtergraph description is to be read.\n" }, { "name": "-accurate_seek (_", "content": "This option enables or disables accurate seeking in input files with the -ss option. It\nis enabled by default, so seeking is accurate when transcoding. Use -noaccurateseek to\ndisable it, which may be useful e.g. when copying some streams and transcoding the\nothers.\n" }, { "name": "-seek_timestamp (_", "content": "This option enables or disables seeking by timestamp in input files with the -ss option.\nIt is disabled by default. If enabled, the argument to the -ss option is considered an\nactual timestamp, and is not offset by the start time of the file. This matters only for\nfiles which do not start from timestamp 0, such as transport streams.\n" }, { "name": "-thread_queue_size _", "content": "For input, this option sets the maximum number of queued packets when reading from the\nfile or device. With low latency / high rate live streams, packets may be discarded if\nthey are not read in a timely manner; setting this value can force ffmpeg to use a\nseparate input thread and read packets as soon as they arrive. By default ffmpeg only\ndoes this if multiple inputs are specified.\n\nFor output, this option specified the maximum number of packets that may be queued to\neach muxing thread.\n" }, { "name": "-sdp_file _", "content": "Print sdp information for an output stream to file. This allows dumping sdp information\nwhen at least one output isn't an rtp stream. (Requires at least one of the output\nformats to be rtp).\n" }, { "name": "-discard (_", "content": "Allows discarding specific streams or frames from streams. Any input stream can be fully\ndiscarded, using value \"all\" whereas selective discarding of frames from a stream occurs\nat the demuxer and is not supported by all demuxers.\n\nnone\nDiscard no frame.\n\ndefault\nDefault, which discards no frames.\n\nnoref\nDiscard all non-reference frames.\n\nbidir\nDiscard all bidirectional frames.\n\nnokey\nDiscard all frames excepts keyframes.\n\nall Discard all frames.\n" }, { "name": "-abort_on _", "content": "Stop and abort on various conditions. The following flags are available:\n\nemptyoutput\nNo packets were passed to the muxer, the output is empty.\n\nemptyoutputstream\nNo packets were passed to the muxer in some of the output streams.\n" }, { "name": "-max_error_rate (_", "content": "Set fraction of decoding frame failures across all inputs which when crossed ffmpeg will\nreturn exit code 69. Crossing this threshold does not terminate processing. Range is a\nfloating-point number between 0 to 1. Default is 2/3.\n" }, { "name": "-xerror (_", "content": "Stop and exit on error\n" }, { "name": "-max_muxing_queue_size _", "content": "When transcoding audio and/or video streams, ffmpeg will not begin writing into the\noutput until it has one packet for each such stream. While waiting for that to happen,\npackets for other streams are buffered. This option sets the size of this buffer, in\npackets, for the matching output stream.\n\nThe default value of this option should be high enough for most uses, so only touch this\noption if you are sure that you need it.\n" }, { "name": "-muxing_queue_data_threshold _", "content": "This is a minimum threshold until which the muxing queue size is not taken into account.\nDefaults to 50 megabytes per stream, and is based on the overall size of packets passed\nto the muxer.\n" }, { "name": "-auto_conversion_filters (_", "content": "Enable automatically inserting format conversion filters in all filter graphs, including\nthose defined by -vf, -af, -filtercomplex and -lavfi. If filter format negotiation\nrequires a conversion, the initialization of the filters will fail. Conversions can\nstill be performed by inserting the relevant conversion filter (scale, aresample) in the\ngraph. On by default, to explicitly disable it you need to specify\n\"-noautoconversionfilters\".\n" }, { "name": "-bits_per_raw_sample[:_", "content": "Declare the number of bits per raw sample in the given output stream to be value. Note\nthat this option sets the information provided to the encoder/muxer, it does not change\nthe stream to conform to this value. Setting values that do not match the stream\nproperties may result in encoding failures or invalid output files.\n" }, { "name": "-stats_enc_pre[:_", "content": "" }, { "name": "-stats_enc_post[:_", "content": "" }, { "name": "-stats_mux_pre[:_", "content": "Write per-frame encoding information about the matching streams into the file given by\npath.\n\n-statsencpre writes information about raw video or audio frames right before they are\nsent for encoding, while -statsencpost writes information about encoded packets as they\nare received from the encoder. -statsmuxpre writes information about packets just as\nthey are about to be sent to the muxer. Every frame or packet produces one line in the\nspecified file. The format of this line is controlled by -statsencprefmt /\n-statsencpostfmt / -statsmuxprefmt.\n\nWhen stats for multiple streams are written into a single file, the lines corresponding\nto different streams will be interleaved. The precise order of this interleaving is not\nspecified and not guaranteed to remain stable between different invocations of the\nprogram, even with the same options.\n" }, { "name": "-stats_enc_pre_fmt[:_", "content": "" }, { "name": "-stats_enc_post_fmt[:_", "content": "" }, { "name": "-stats_mux_pre_fmt[:_", "content": "Specify the format for the lines written with -statsencpre / -statsencpost /\n-statsmuxpre.\n\nformatspec is a string that may contain directives of the form {fmt}. formatspec is\nbackslash-escaped --- use \\{, \\}, and \\\\ to write a literal {, }, or \\, respectively,\ninto the output.\n\nThe directives given with fmt may be one of the following:\n\nfidx\nIndex of the output file.\n\nsidx\nIndex of the output stream in the file.\n\nn Frame number. Pre-encoding: number of frames sent to the encoder so far. Post-\nencoding: number of packets received from the encoder so far. Muxing: number of\npackets submitted to the muxer for this stream so far.\n\nni Input frame number. Index of the input frame (i.e. output by a decoder) that\ncorresponds to this output frame or packet. -1 if unavailable.\n\ntb Timebase in which this frame/packet's timestamps are expressed, as a rational number\nnum/den. Note that encoder and muxer may use different timebases.\n\ntbi Timebase for ptsi, as a rational number num/den. Available when ptsi is available,\n0/1 otherwise.\n\npts Presentation timestamp of the frame or packet, as an integer. Should be multiplied by\nthe timebase to compute presentation time.\n\nptsi\nPresentation timestamp of the input frame (see ni), as an integer. Should be\nmultiplied by tbi to compute presentation time. Printed as (2^63 - 1 =\n9223372036854775807) when not available.\n\nt Presentation time of the frame or packet, as a decimal number. Equal to pts\nmultiplied by tb.\n\nti Presentation time of the input frame (see ni), as a decimal number. Equal to ptsi\nmultiplied by tbi. Printed as inf when not available.\n\ndts (packet)\nDecoding timestamp of the packet, as an integer. Should be multiplied by the timebase\nto compute presentation time.\n\ndt (packet)\nDecoding time of the frame or packet, as a decimal number. Equal to dts multiplied by\ntb.\n\nsn (frame,audio)\nNumber of audio samples sent to the encoder so far.\n\nsamp (frame,audio)\nNumber of audio samples in the frame.\n\nsize (packet)\nSize of the encoded packet in bytes.\n\nbr (packet)\nCurrent bitrate in bits per second. Post-encoding only.\n\nabr (packet)\nAverage bitrate for the whole stream so far, in bits per second, -1 if it cannot be\ndetermined at this point. Post-encoding only.\n\nDirectives tagged with packet may only be used with -statsencpostfmt and\n-statsmuxprefmt.\n\nDirectives tagged with frame may only be used with -statsencprefmt.\n\nDirectives tagged with audio may only be used with audio streams.\n\nThe default format strings are:\n\npre-encoding\n{fidx} {sidx} {n} {t}\n\npost-encoding\n{fidx} {sidx} {n} {t}\n\nIn the future, new items may be added to the end of the default formatting strings. Users\nwho depend on the format staying exactly the same, should prescribe it manually.\n\nNote that stats for different streams written into the same file may have different\nformats.\n" }, { "name": "Preset files", "content": "A preset file contains a sequence of option=value pairs, one for each line, specifying a\nsequence of options which would be awkward to specify on the command line. Lines starting\nwith the hash ('#') character are ignored and are used to provide comments. Check the presets\ndirectory in the FFmpeg source tree for examples.\n\nThere are two types of preset files: ffpreset and avpreset files.\n\nffpreset files\n\nffpreset files are specified with the \"vpre\", \"apre\", \"spre\", and \"fpre\" options. The \"fpre\"\noption takes the filename of the preset instead of a preset name as input and can be used for\nany kind of codec. For the \"vpre\", \"apre\", and \"spre\" options, the options specified in a\npreset file are applied to the currently selected codec of the same type as the preset\noption.\n\nThe argument passed to the \"vpre\", \"apre\", and \"spre\" preset options identifies the preset\nfile to use according to the following rules:\n\nFirst ffmpeg searches for a file named arg.ffpreset in the directories $FFMPEGDATADIR (if\nset), and $HOME/.ffmpeg, and in the datadir defined at configuration time (usually\nPREFIX/share/ffmpeg) or in a ffpresets folder along the executable on win32, in that order.\nFor example, if the argument is \"libvpx-1080p\", it will search for the file\nlibvpx-1080p.ffpreset.\n\nIf no such file is found, then ffmpeg will search for a file named codecname-arg.ffpreset in\nthe above-mentioned directories, where codecname is the name of the codec to which the\npreset file options will be applied. For example, if you select the video codec with \"-vcodec\nlibvpx\" and use \"-vpre 1080p\", then it will search for the file libvpx-1080p.ffpreset.\n\navpreset files\n\navpreset files are specified with the \"pre\" option. They work similar to ffpreset files, but\nthey only allow encoder- specific options. Therefore, an option=value pair specifying an\nencoder cannot be used.\n\nWhen the \"pre\" option is specified, ffmpeg will look for files with the suffix .avpreset in\nthe directories $AVCONVDATADIR (if set), and $HOME/.avconv, and in the datadir defined at\nconfiguration time (usually PREFIX/share/ffmpeg), in that order.\n\nFirst ffmpeg searches for a file named codecname-arg.avpreset in the above-mentioned\ndirectories, where codecname is the name of the codec to which the preset file options will\nbe applied. For example, if you select the video codec with \"-vcodec libvpx\" and use \"-pre\n1080p\", then it will search for the file libvpx-1080p.avpreset.\n\nIf no such file is found, then ffmpeg will search for a file named arg.avpreset in the same\ndirectories.\n" }, { "name": "vstats file format", "content": "The \"-vstats\" and \"-vstatsfile\" options enable generation of a file containing statistics\nabout the generated video outputs.\n\nThe \"-vstatsversion\" option controls the format version of the generated file.\n\nWith version 1 the format is:\n\nframe= q= PSNR= fsize= ssize= kB time= br= kbits/s avgbr= kbits/s\n\nWith version 2 the format is:\n\nout= st= frame= q= f PSNR= fsize= ssize= kB time= br= kbits/s avgbr= kbits/s\n\nThe value corresponding to each key is described below:\n" }, { "name": "avg_br", "content": "average bitrate expressed in Kbits/s\n\nbr bitrate expressed in Kbits/s\n" }, { "name": "frame", "content": "number of encoded frame\n\nout out file index\n\nPSNR\nPeak Signal to Noise Ratio\n\nq quality of the frame\n" }, { "name": "f_size", "content": "encoded packet size expressed as number of bytes\n" }, { "name": "s_size", "content": "stream size expressed in KiB\n\nst out file stream index\n" }, { "name": "time", "content": "time of the packet\n" }, { "name": "type", "content": "picture type\n\nSee also the -statsenc options for an alternative way to show encoding statistics.\n" } ] }, "EXAMPLES": { "content": "", "subsections": [ { "name": "Video and Audio grabbing", "content": "If you specify the input format and device then ffmpeg can grab video and audio directly.\n\nffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg\n\nOr with an ALSA audio source (mono input, card id 1) instead of OSS:\n\nffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg\n\nNote that you must activate the right video source and channel before launching ffmpeg with\nany TV viewer such as by Gerd Knorr. You also have to set\nthe audio recording levels correctly with a standard mixer.\n" }, { "name": "X11 grabbing", "content": "Grab the X11 display with ffmpeg via\n\nffmpeg -f x11grab -videosize cif -framerate 25 -i :0.0 /tmp/out.mpg\n\n0.0 is display.screen number of your X11 server, same as the DISPLAY environment variable.\n\nffmpeg -f x11grab -videosize cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg\n\n0.0 is display.screen number of your X11 server, same as the DISPLAY environment variable. 10\nis the x-offset and 20 the y-offset for the grabbing.\n" }, { "name": "Video and Audio file format conversion", "content": "Any supported file format and protocol can serve as input to ffmpeg:\n\nExamples:\n\n• You can use YUV files as input:\n\nffmpeg -i /tmp/test%d.Y /tmp/out.mpg\n\nIt will use the files:\n\n/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,\n/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...\n\nThe Y files use twice the resolution of the U and V files. They are raw files, without\nheader. They can be generated by all decent video decoders. You must specify the size of\nthe image with the -s option if ffmpeg cannot guess it.\n\n• You can input from a raw YUV420P file:\n\nffmpeg -i /tmp/test.yuv /tmp/out.avi\n\ntest.yuv is a file containing raw YUV planar data. Each frame is composed of the Y plane\nfollowed by the U and V planes at half vertical and horizontal resolution.\n\n• You can output to a raw YUV420P file:\n\nffmpeg -i mydivx.avi hugefile.yuv\n\n• You can set several input files and output files:\n\nffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg\n\nConverts the audio file a.wav and the raw YUV video file a.yuv to MPEG file a.mpg.\n\n• You can also do audio and video conversions at the same time:\n\nffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2\n\nConverts a.wav to MPEG audio at 22050 Hz sample rate.\n\n• You can encode to several formats at the same time and define a mapping from input stream\nto output streams:\n\nffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2\n\nConverts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map file:index'\nspecifies which input stream is used for each output stream, in the order of the\ndefinition of output streams.\n\n• You can transcode decrypted VOBs:\n\nffmpeg -i snatch1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi\n\nThis is a typical DVD ripping example; the input is a VOB file, the output an AVI file\nwith MPEG-4 video and MP3 audio. Note that in this command we use B-frames so the MPEG-4\nstream is DivX5 compatible, and GOP size is 300 which means one intra frame every 10\nseconds for 29.97fps input video. Furthermore, the audio stream is MP3-encoded so you\nneed to enable LAME support by passing \"--enable-libmp3lame\" to configure. The mapping\nis particularly useful for DVD transcoding to get the desired audio language.\n\nNOTE: To see the supported input formats, use \"ffmpeg -demuxers\".\n\n• You can extract images from a video, or create a video from many images:\n\nFor extracting images from a video:\n\nffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg\n\nThis will extract one video frame per second from the video and will output them in files\nnamed foo-001.jpeg, foo-002.jpeg, etc. Images will be rescaled to fit the new WxH values.\n\nIf you want to extract just a limited number of frames, you can use the above command in\ncombination with the \"-frames:v\" or \"-t\" option, or in combination with -ss to start\nextracting from a certain point in time.\n\nFor creating a video from many images:\n\nffmpeg -f image2 -framerate 12 -i foo-%03d.jpeg -s WxH foo.avi\n\nThe syntax \"foo-%03d.jpeg\" specifies to use a decimal number composed of three digits\npadded with zeroes to express the sequence number. It is the same syntax supported by the\nC printf function, but only formats accepting a normal integer are suitable.\n\nWhen importing an image sequence, -i also supports expanding shell-like wildcard patterns\n(globbing) internally, by selecting the image2-specific \"-patterntype glob\" option.\n\nFor example, for creating a video from filenames matching the glob pattern \"foo-*.jpeg\":\n\nffmpeg -f image2 -patterntype glob -framerate 12 -i 'foo-*.jpeg' -s WxH foo.avi\n\n• You can put many streams of the same type in the output:\n\nffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut\n\nThe resulting output file test12.nut will contain the first four streams from the input\nfiles in reverse order.\n\n• To force CBR video output:\n\nffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v\n\n• The four options lmin, lmax, mblmin and mblmax use 'lambda' units, but you may use the\nQP2LAMBDA constant to easily convert from 'q' units:\n\nffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext\n" } ] }, "SYNTAX": { "content": "This section documents the syntax and formats employed by the FFmpeg libraries and tools.\n", "subsections": [ { "name": "Quoting and escaping", "content": "FFmpeg adopts the following quoting and escaping mechanism, unless explicitly specified. The\nfollowing rules are applied:\n\n• ' and \\ are special characters (respectively used for quoting and escaping). In addition\nto them, there might be other special characters depending on the specific syntax where\nthe escaping and quoting are employed.\n\n• A special character is escaped by prefixing it with a \\.\n\n• All characters enclosed between '' are included literally in the parsed string. The quote\ncharacter ' itself cannot be quoted, so you may need to close the quote and escape it.\n\n• Leading and trailing whitespaces, unless escaped or quoted, are removed from the parsed\nstring.\n\nNote that you may need to add a second level of escaping when using the command line or a\nscript, which depends on the syntax of the adopted shell language.\n\nThe function \"avgettoken\" defined in libavutil/avstring.h can be used to parse a token\nquoted or escaped according to the rules defined above.\n\nThe tool tools/ffescape in the FFmpeg source tree can be used to automatically quote or\nescape a string in a script.\n\nExamples\n\n• Escape the string \"Crime d'Amour\" containing the \"'\" special character:\n\nCrime d\\'Amour\n\n• The string above contains a quote, so the \"'\" needs to be escaped when quoting it:\n\n'Crime d'\\''Amour'\n\n• Include leading or trailing whitespaces using quoting:\n\n' this string starts and ends with whitespaces '\n\n• Escaping and quoting can be mixed together:\n\n' The string '\\'string\\'' is a string '\n\n• To include a literal \\ you can use either escaping or quoting:\n\n'c:\\foo' can be written as c:\\\\foo\n" }, { "name": "Date", "content": "The accepted syntax is:\n\n[(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]\nnow\n\nIf the value is \"now\" it takes the current time.\n\nTime is local time unless Z is appended, in which case it is interpreted as UTC. If the\nyear-month-day part is not specified it takes the current year-month-day.\n" }, { "name": "Time duration", "content": "There are two accepted syntaxes for expressing time duration.\n\n[-][:]:[....]\n\nHH expresses the number of hours, MM the number of minutes for a maximum of 2 digits, and SS\nthe number of seconds for a maximum of 2 digits. The m at the end expresses decimal value for\nSS.\n\nor\n\n[-]+[....][s|ms|us]\n\nS expresses the number of seconds, with the optional decimal part m. The optional literal\nsuffixes s, ms or us indicate to interpret the value as seconds, milliseconds or\nmicroseconds, respectively.\n\nIn both expressions, the optional - indicates negative duration.\n\nExamples\n\nThe following examples are all valid time duration:\n\n55 55 seconds\n\n0.2 0.2 seconds\n" }, { "name": "200ms", "content": "200 milliseconds, that's 0.2s\n" }, { "name": "200000us", "content": "200000 microseconds, that's 0.2s\n" }, { "name": "12:03:45", "content": "12 hours, 03 minutes and 45 seconds\n" }, { "name": "23.189", "content": "23.189 seconds\n" }, { "name": "Video size", "content": "Specify the size of the sourced video, it may be a string of the form widthxheight, or the\nname of a size abbreviation.\n\nThe following abbreviations are recognized:\n" }, { "name": "ntsc", "content": "720x480\n\npal 720x576\n" }, { "name": "qntsc", "content": "352x240\n" }, { "name": "qpal", "content": "352x288\n" }, { "name": "sntsc", "content": "640x480\n" }, { "name": "spal", "content": "768x576\n" }, { "name": "film", "content": "352x240\n" }, { "name": "ntsc-film", "content": "352x240\n" }, { "name": "sqcif", "content": "128x96\n" }, { "name": "qcif", "content": "176x144\n\ncif 352x288\n" }, { "name": "4cif", "content": "704x576\n" }, { "name": "16cif", "content": "1408x1152\n" }, { "name": "qqvga", "content": "160x120\n" }, { "name": "qvga", "content": "320x240\n\nvga 640x480\n" }, { "name": "svga", "content": "800x600\n\nxga 1024x768\n" }, { "name": "uxga", "content": "1600x1200\n" }, { "name": "qxga", "content": "2048x1536\n" }, { "name": "sxga", "content": "1280x1024\n" }, { "name": "qsxga", "content": "2560x2048\n" }, { "name": "hsxga", "content": "5120x4096\n" }, { "name": "wvga", "content": "852x480\n" }, { "name": "wxga", "content": "1366x768\n" }, { "name": "wsxga", "content": "1600x1024\n" }, { "name": "wuxga", "content": "1920x1200\n" }, { "name": "woxga", "content": "2560x1600\n" }, { "name": "wqsxga", "content": "3200x2048\n" }, { "name": "wquxga", "content": "3840x2400\n" }, { "name": "whsxga", "content": "6400x4096\n" }, { "name": "whuxga", "content": "7680x4800\n\ncga 320x200\n\nega 640x350\n" }, { "name": "hd480", "content": "852x480\n" }, { "name": "hd720", "content": "1280x720\n" }, { "name": "hd1080", "content": "1920x1080\n\n2k 2048x1080\n" }, { "name": "2kflat", "content": "1998x1080\n" }, { "name": "2kscope", "content": "2048x858\n\n4k 4096x2160\n" }, { "name": "4kflat", "content": "3996x2160\n" }, { "name": "4kscope", "content": "4096x1716\n\nnhd 640x360\n" }, { "name": "hqvga", "content": "240x160\n" }, { "name": "wqvga", "content": "400x240\n" }, { "name": "fwqvga", "content": "432x240\n" }, { "name": "hvga", "content": "480x320\n\nqhd 960x540\n" }, { "name": "2kdci", "content": "2048x1080\n" }, { "name": "4kdci", "content": "4096x2160\n" }, { "name": "uhd2160", "content": "3840x2160\n" }, { "name": "uhd4320", "content": "7680x4320\n" }, { "name": "Video rate", "content": "Specify the frame rate of a video, expressed as the number of frames generated per second. It\nhas to be a string in the format frameratenum/framerateden, an integer number, a float\nnumber or a valid video frame rate abbreviation.\n\nThe following abbreviations are recognized:\n" }, { "name": "ntsc", "content": "30000/1001\n\npal 25/1\n" }, { "name": "qntsc", "content": "30000/1001\n" }, { "name": "qpal", "content": "25/1\n" }, { "name": "sntsc", "content": "30000/1001\n" }, { "name": "spal", "content": "25/1\n" }, { "name": "film", "content": "24/1\n" }, { "name": "ntsc-film", "content": "24000/1001\n" }, { "name": "Ratio", "content": "A ratio can be expressed as an expression, or in the form numerator:denominator.\n\nNote that a ratio with infinite (1/0) or negative value is considered valid, so you should\ncheck on the returned value if you want to exclude those values.\n\nThe undefined value can be expressed using the \"0:0\" string.\n" }, { "name": "Color", "content": "It can be the name of a color as defined below (case insensitive match) or a\n\"[0x|#]RRGGBB[AA]\" sequence, possibly followed by @ and a string representing the alpha\ncomponent.\n\nThe alpha component may be a string composed by \"0x\" followed by an hexadecimal number or a\ndecimal number between 0.0 and 1.0, which represents the opacity value (0x00 or 0.0 means\ncompletely transparent, 0xff or 1.0 completely opaque). If the alpha component is not\nspecified then 0xff is assumed.\n\nThe string random will result in a random color.\n\nThe following names of colors are recognized:\n" }, { "name": "AliceBlue", "content": "0xF0F8FF\n" }, { "name": "AntiqueWhite", "content": "0xFAEBD7\n" }, { "name": "Aqua", "content": "0x00FFFF\n" }, { "name": "Aquamarine", "content": "0x7FFFD4\n" }, { "name": "Azure", "content": "0xF0FFFF\n" }, { "name": "Beige", "content": "0xF5F5DC\n" }, { "name": "Bisque", "content": "0xFFE4C4\n" }, { "name": "Black", "content": "0x000000\n" }, { "name": "BlanchedAlmond", "content": "0xFFEBCD\n" }, { "name": "Blue", "content": "0x0000FF\n" }, { "name": "BlueViolet", "content": "0x8A2BE2\n" }, { "name": "Brown", "content": "0xA52A2A\n" }, { "name": "BurlyWood", "content": "0xDEB887\n" }, { "name": "CadetBlue", "content": "0x5F9EA0\n" }, { "name": "Chartreuse", "content": "0x7FFF00\n" }, { "name": "Chocolate", "content": "0xD2691E\n" }, { "name": "Coral", "content": "0xFF7F50\n" }, { "name": "CornflowerBlue", "content": "0x6495ED\n" }, { "name": "Cornsilk", "content": "0xFFF8DC\n" }, { "name": "Crimson", "content": "0xDC143C\n" }, { "name": "Cyan", "content": "0x00FFFF\n" }, { "name": "DarkBlue", "content": "0x00008B\n" }, { "name": "DarkCyan", "content": "0x008B8B\n" }, { "name": "DarkGoldenRod", "content": "0xB8860B\n" }, { "name": "DarkGray", "content": "0xA9A9A9\n" }, { "name": "DarkGreen", "content": "0x006400\n" }, { "name": "DarkKhaki", "content": "0xBDB76B\n" }, { "name": "DarkMagenta", "content": "0x8B008B\n" }, { "name": "DarkOliveGreen", "content": "0x556B2F\n" }, { "name": "Darkorange", "content": "0xFF8C00\n" }, { "name": "DarkOrchid", "content": "0x9932CC\n" }, { "name": "DarkRed", "content": "0x8B0000\n" }, { "name": "DarkSalmon", "content": "0xE9967A\n" }, { "name": "DarkSeaGreen", "content": "0x8FBC8F\n" }, { "name": "DarkSlateBlue", "content": "0x483D8B\n" }, { "name": "DarkSlateGray", "content": "0x2F4F4F\n" }, { "name": "DarkTurquoise", "content": "0x00CED1\n" }, { "name": "DarkViolet", "content": "0x9400D3\n" }, { "name": "DeepPink", "content": "0xFF1493\n" }, { "name": "DeepSkyBlue", "content": "0x00BFFF\n" }, { "name": "DimGray", "content": "0x696969\n" }, { "name": "DodgerBlue", "content": "0x1E90FF\n" }, { "name": "FireBrick", "content": "0xB22222\n" }, { "name": "FloralWhite", "content": "0xFFFAF0\n" }, { "name": "ForestGreen", "content": "0x228B22\n" }, { "name": "Fuchsia", "content": "0xFF00FF\n" }, { "name": "Gainsboro", "content": "0xDCDCDC\n" }, { "name": "GhostWhite", "content": "0xF8F8FF\n" }, { "name": "Gold", "content": "0xFFD700\n" }, { "name": "GoldenRod", "content": "0xDAA520\n" }, { "name": "Gray", "content": "0x808080\n" }, { "name": "Green", "content": "0x008000\n" }, { "name": "GreenYellow", "content": "0xADFF2F\n" }, { "name": "HoneyDew", "content": "0xF0FFF0\n" }, { "name": "HotPink", "content": "0xFF69B4\n" }, { "name": "IndianRed", "content": "0xCD5C5C\n" }, { "name": "Indigo", "content": "0x4B0082\n" }, { "name": "Ivory", "content": "0xFFFFF0\n" }, { "name": "Khaki", "content": "0xF0E68C\n" }, { "name": "Lavender", "content": "0xE6E6FA\n" }, { "name": "LavenderBlush", "content": "0xFFF0F5\n" }, { "name": "LawnGreen", "content": "0x7CFC00\n" }, { "name": "LemonChiffon", "content": "0xFFFACD\n" }, { "name": "LightBlue", "content": "0xADD8E6\n" }, { "name": "LightCoral", "content": "0xF08080\n" }, { "name": "LightCyan", "content": "0xE0FFFF\n" }, { "name": "LightGoldenRodYellow", "content": "0xFAFAD2\n" }, { "name": "LightGreen", "content": "0x90EE90\n" }, { "name": "LightGrey", "content": "0xD3D3D3\n" }, { "name": "LightPink", "content": "0xFFB6C1\n" }, { "name": "LightSalmon", "content": "0xFFA07A\n" }, { "name": "LightSeaGreen", "content": "0x20B2AA\n" }, { "name": "LightSkyBlue", "content": "0x87CEFA\n" }, { "name": "LightSlateGray", "content": "0x778899\n" }, { "name": "LightSteelBlue", "content": "0xB0C4DE\n" }, { "name": "LightYellow", "content": "0xFFFFE0\n" }, { "name": "Lime", "content": "0x00FF00\n" }, { "name": "LimeGreen", "content": "0x32CD32\n" }, { "name": "Linen", "content": "0xFAF0E6\n" }, { "name": "Magenta", "content": "0xFF00FF\n" }, { "name": "Maroon", "content": "0x800000\n" }, { "name": "MediumAquaMarine", "content": "0x66CDAA\n" }, { "name": "MediumBlue", "content": "0x0000CD\n" }, { "name": "MediumOrchid", "content": "0xBA55D3\n" }, { "name": "MediumPurple", "content": "0x9370D8\n" }, { "name": "MediumSeaGreen", "content": "0x3CB371\n" }, { "name": "MediumSlateBlue", "content": "0x7B68EE\n" }, { "name": "MediumSpringGreen", "content": "0x00FA9A\n" }, { "name": "MediumTurquoise", "content": "0x48D1CC\n" }, { "name": "MediumVioletRed", "content": "0xC71585\n" }, { "name": "MidnightBlue", "content": "0x191970\n" }, { "name": "MintCream", "content": "0xF5FFFA\n" }, { "name": "MistyRose", "content": "0xFFE4E1\n" }, { "name": "Moccasin", "content": "0xFFE4B5\n" }, { "name": "NavajoWhite", "content": "0xFFDEAD\n" }, { "name": "Navy", "content": "0x000080\n" }, { "name": "OldLace", "content": "0xFDF5E6\n" }, { "name": "Olive", "content": "0x808000\n" }, { "name": "OliveDrab", "content": "0x6B8E23\n" }, { "name": "Orange", "content": "0xFFA500\n" }, { "name": "OrangeRed", "content": "0xFF4500\n" }, { "name": "Orchid", "content": "0xDA70D6\n" }, { "name": "PaleGoldenRod", "content": "0xEEE8AA\n" }, { "name": "PaleGreen", "content": "0x98FB98\n" }, { "name": "PaleTurquoise", "content": "0xAFEEEE\n" }, { "name": "PaleVioletRed", "content": "0xD87093\n" }, { "name": "PapayaWhip", "content": "0xFFEFD5\n" }, { "name": "PeachPuff", "content": "0xFFDAB9\n" }, { "name": "Peru", "content": "0xCD853F\n" }, { "name": "Pink", "content": "0xFFC0CB\n" }, { "name": "Plum", "content": "0xDDA0DD\n" }, { "name": "PowderBlue", "content": "0xB0E0E6\n" }, { "name": "Purple", "content": "0x800080\n\nRed 0xFF0000\n" }, { "name": "RosyBrown", "content": "0xBC8F8F\n" }, { "name": "RoyalBlue", "content": "0x4169E1\n" }, { "name": "SaddleBrown", "content": "0x8B4513\n" }, { "name": "Salmon", "content": "0xFA8072\n" }, { "name": "SandyBrown", "content": "0xF4A460\n" }, { "name": "SeaGreen", "content": "0x2E8B57\n" }, { "name": "SeaShell", "content": "0xFFF5EE\n" }, { "name": "Sienna", "content": "0xA0522D\n" }, { "name": "Silver", "content": "0xC0C0C0\n" }, { "name": "SkyBlue", "content": "0x87CEEB\n" }, { "name": "SlateBlue", "content": "0x6A5ACD\n" }, { "name": "SlateGray", "content": "0x708090\n" }, { "name": "Snow", "content": "0xFFFAFA\n" }, { "name": "SpringGreen", "content": "0x00FF7F\n" }, { "name": "SteelBlue", "content": "0x4682B4\n\nTan 0xD2B48C\n" }, { "name": "Teal", "content": "0x008080\n" }, { "name": "Thistle", "content": "0xD8BFD8\n" }, { "name": "Tomato", "content": "0xFF6347\n" }, { "name": "Turquoise", "content": "0x40E0D0\n" }, { "name": "Violet", "content": "0xEE82EE\n" }, { "name": "Wheat", "content": "0xF5DEB3\n" }, { "name": "White", "content": "0xFFFFFF\n" }, { "name": "WhiteSmoke", "content": "0xF5F5F5\n" }, { "name": "Yellow", "content": "0xFFFF00\n" }, { "name": "YellowGreen", "content": "0x9ACD32\n" }, { "name": "Channel Layout", "content": "A channel layout specifies the spatial disposition of the channels in a multi-channel audio\nstream. To specify a channel layout, FFmpeg makes use of a special syntax.\n\nIndividual channels are identified by an id, as given by the table below:\n\nFL front left\n\nFR front right\n\nFC front center\n\nLFE low frequency\n\nBL back left\n\nBR back right\n\nFLC front left-of-center\n\nFRC front right-of-center\n\nBC back center\n\nSL side left\n\nSR side right\n\nTC top center\n\nTFL top front left\n\nTFC top front center\n\nTFR top front right\n\nTBL top back left\n\nTBC top back center\n\nTBR top back right\n\nDL downmix left\n\nDR downmix right\n\nWL wide left\n\nWR wide right\n\nSDL surround direct left\n\nSDR surround direct right\n\nLFE2\nlow frequency 2\n\nStandard channel layout compositions can be specified by using the following identifiers:\n" }, { "name": "mono", "content": "FC\n" }, { "name": "stereo", "content": "FL+FR\n\n2.1 FL+FR+LFE\n\n3.0 FL+FR+FC\n" }, { "name": "3.0(back)", "content": "FL+FR+BC\n\n4.0 FL+FR+FC+BC\n" }, { "name": "quad", "content": "FL+FR+BL+BR\n" }, { "name": "quad(side)", "content": "FL+FR+SL+SR\n\n3.1 FL+FR+FC+LFE\n\n5.0 FL+FR+FC+BL+BR\n" }, { "name": "5.0(side)", "content": "FL+FR+FC+SL+SR\n\n4.1 FL+FR+FC+LFE+BC\n\n5.1 FL+FR+FC+LFE+BL+BR\n" }, { "name": "5.1(side)", "content": "FL+FR+FC+LFE+SL+SR\n\n6.0 FL+FR+FC+BC+SL+SR\n" }, { "name": "6.0(front)", "content": "FL+FR+FLC+FRC+SL+SR\n" }, { "name": "3.1.2", "content": "FL+FR+FC+LFE+TFL+TFR\n" }, { "name": "hexagonal", "content": "FL+FR+FC+BL+BR+BC\n\n6.1 FL+FR+FC+LFE+BC+SL+SR\n\n6.1 FL+FR+FC+LFE+BL+BR+BC\n" }, { "name": "6.1(front)", "content": "FL+FR+LFE+FLC+FRC+SL+SR\n\n7.0 FL+FR+FC+BL+BR+SL+SR\n" }, { "name": "7.0(front)", "content": "FL+FR+FC+FLC+FRC+SL+SR\n\n7.1 FL+FR+FC+LFE+BL+BR+SL+SR\n" }, { "name": "7.1(wide)", "content": "FL+FR+FC+LFE+BL+BR+FLC+FRC\n" }, { "name": "7.1(wide-side)", "content": "FL+FR+FC+LFE+FLC+FRC+SL+SR\n" }, { "name": "5.1.2", "content": "FL+FR+FC+LFE+BL+BR+TFL+TFR\n" }, { "name": "octagonal", "content": "FL+FR+FC+BL+BR+BC+SL+SR\n" }, { "name": "cube", "content": "FL+FR+BL+BR+TFL+TFR+TBL+TBR\n" }, { "name": "5.1.4", "content": "FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR\n" }, { "name": "7.1.2", "content": "FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR\n" }, { "name": "7.1.4", "content": "FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR\n" }, { "name": "hexadecagonal", "content": "FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR\n" }, { "name": "downmix", "content": "DL+DR\n" }, { "name": "22.2", "content": "FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR\n\nA custom channel layout can be specified as a sequence of terms, separated by '+'. Each term\ncan be:\n\n• the name of a single channel (e.g. FL, FR, FC, LFE, etc.), each optionally containing a\ncustom name after a '@', (e.g. FL@Left, FR@Right, FC@Center, LFE@LowFrequency, etc.)\n\nA standard channel layout can be specified by the following:\n\n• the name of a single channel (e.g. FL, FR, FC, LFE, etc.)\n\n• the name of a standard channel layout (e.g. mono, stereo, 4.0, quad, 5.0, etc.)\n\n• a number of channels, in decimal, followed by 'c', yielding the default channel layout\nfor that number of channels (see the function \"avchannellayoutdefault\"). Note that not\nall channel counts have a default layout.\n\n• a number of channels, in decimal, followed by 'C', yielding an unknown channel layout\nwith the specified number of channels. Note that not all channel layout specification\nstrings support unknown channel layouts.\n\n• a channel layout mask, in hexadecimal starting with \"0x\" (see the \"AVCH*\" macros in\nlibavutil/channellayout.h.\n\nBefore libavutil version 53 the trailing character \"c\" to specify a number of channels was\noptional, but now it is required, while a channel layout mask can also be specified as a\ndecimal number (if and only if not followed by \"c\" or \"C\").\n\nSee also the function \"avchannellayoutfromstring\" defined in libavutil/channellayout.h.\n" } ] }, "EXPRESSION EVALUATION": { "content": "When evaluating an arithmetic expression, FFmpeg uses an internal formula evaluator,\nimplemented through the libavutil/eval.h interface.\n\nAn expression may contain unary, binary operators, constants, and functions.\n\nTwo expressions expr1 and expr2 can be combined to form another expression \"expr1;expr2\".\nexpr1 and expr2 are evaluated in turn, and the new expression evaluates to the value of\nexpr2.\n\nThe following binary operators are available: \"+\", \"-\", \"*\", \"/\", \"^\".\n\nThe following unary operators are available: \"+\", \"-\".\n\nThe following functions are available:\n", "subsections": [ { "name": "abs(x)", "content": "Compute absolute value of x.\n" }, { "name": "acos(x)", "content": "Compute arccosine of x.\n" }, { "name": "asin(x)", "content": "Compute arcsine of x.\n" }, { "name": "atan(x)", "content": "Compute arctangent of x.\n" }, { "name": "atan2(x, y)", "content": "Compute principal value of the arc tangent of y/x.\n" }, { "name": "between(x, min, max)", "content": "Return 1 if x is greater than or equal to min and lesser than or equal to max, 0\notherwise.\n" }, { "name": "bitand(x, y)", "content": "" }, { "name": "bitor(x, y)", "content": "Compute bitwise and/or operation on x and y.\n\nThe results of the evaluation of x and y are converted to integers before executing the\nbitwise operation.\n\nNote that both the conversion to integer and the conversion back to floating point can\nlose precision. Beware of unexpected results for large numbers (usually 2^53 and larger).\n" }, { "name": "ceil(expr)", "content": "Round the value of expression expr upwards to the nearest integer. For example,\n\"ceil(1.5)\" is \"2.0\".\n" }, { "name": "clip(x, min, max)", "content": "Return the value of x clipped between min and max.\n" }, { "name": "cos(x)", "content": "Compute cosine of x.\n" }, { "name": "cosh(x)", "content": "Compute hyperbolic cosine of x.\n" }, { "name": "eq(x, y)", "content": "Return 1 if x and y are equivalent, 0 otherwise.\n" }, { "name": "exp(x)", "content": "Compute exponential of x (with base \"e\", the Euler's number).\n" }, { "name": "floor(expr)", "content": "Round the value of expression expr downwards to the nearest integer. For example,\n\"floor(-1.5)\" is \"-2.0\".\n" }, { "name": "gauss(x)", "content": "Compute Gauss function of x, corresponding to \"exp(-x*x/2) / sqrt(2*PI)\".\n" }, { "name": "gcd(x, y)", "content": "Return the greatest common divisor of x and y. If both x and y are 0 or either or both\nare less than zero then behavior is undefined.\n" }, { "name": "gt(x, y)", "content": "Return 1 if x is greater than y, 0 otherwise.\n" }, { "name": "gte(x, y)", "content": "Return 1 if x is greater than or equal to y, 0 otherwise.\n" }, { "name": "hypot(x, y)", "content": "This function is similar to the C function with the same name; it returns \"sqrt(x*x +\ny*y)\", the length of the hypotenuse of a right triangle with sides of length x and y, or\nthe distance of the point (x, y) from the origin.\n" }, { "name": "if(x, y)", "content": "Evaluate x, and if the result is non-zero return the result of the evaluation of y,\nreturn 0 otherwise.\n" }, { "name": "if(x, y, z)", "content": "Evaluate x, and if the result is non-zero return the evaluation result of y, otherwise\nthe evaluation result of z.\n" }, { "name": "ifnot(x, y)", "content": "Evaluate x, and if the result is zero return the result of the evaluation of y, return 0\notherwise.\n" }, { "name": "ifnot(x, y, z)", "content": "Evaluate x, and if the result is zero return the evaluation result of y, otherwise the\nevaluation result of z.\n" }, { "name": "isinf(x)", "content": "Return 1.0 if x is +/-INFINITY, 0.0 otherwise.\n" }, { "name": "isnan(x)", "content": "Return 1.0 if x is NAN, 0.0 otherwise.\n" }, { "name": "ld(var)", "content": "Load the value of the internal variable with number var, which was previously stored with\nst(var, expr). The function returns the loaded value.\n" }, { "name": "lerp(x, y, z)", "content": "Return linear interpolation between x and y by amount of z.\n" }, { "name": "log(x)", "content": "Compute natural logarithm of x.\n" }, { "name": "lt(x, y)", "content": "Return 1 if x is lesser than y, 0 otherwise.\n" }, { "name": "lte(x, y)", "content": "Return 1 if x is lesser than or equal to y, 0 otherwise.\n" }, { "name": "max(x, y)", "content": "Return the maximum between x and y.\n" }, { "name": "min(x, y)", "content": "Return the minimum between x and y.\n" }, { "name": "mod(x, y)", "content": "Compute the remainder of division of x by y.\n" }, { "name": "not(expr)", "content": "Return 1.0 if expr is zero, 0.0 otherwise.\n" }, { "name": "pow(x, y)", "content": "Compute the power of x elevated y, it is equivalent to \"(x)^(y)\".\n" }, { "name": "print(t)", "content": "" }, { "name": "print(t, l)", "content": "Print the value of expression t with loglevel l. If l is not specified then a default log\nlevel is used. Returns the value of the expression printed.\n\nPrints t with loglevel l\n" }, { "name": "random(x)", "content": "Return a pseudo random value between 0.0 and 1.0. x is the index of the internal variable\nwhich will be used to save the seed/state.\n" }, { "name": "root(expr, max)", "content": "Find an input value for which the function represented by expr with argument ld(0) is 0\nin the interval 0..max.\n\nThe expression in expr must denote a continuous function or the result is undefined.\n\nld(0) is used to represent the function input value, which means that the given\nexpression will be evaluated multiple times with various input values that the expression\ncan access through ld(0). When the expression evaluates to 0 then the corresponding input\nvalue will be returned.\n" }, { "name": "round(expr)", "content": "Round the value of expression expr to the nearest integer. For example, \"round(1.5)\" is\n\"2.0\".\n" }, { "name": "sgn(x)", "content": "Compute sign of x.\n" }, { "name": "sin(x)", "content": "Compute sine of x.\n" }, { "name": "sinh(x)", "content": "Compute hyperbolic sine of x.\n" }, { "name": "sqrt(expr)", "content": "Compute the square root of expr. This is equivalent to \"(expr)^.5\".\n" }, { "name": "squish(x)", "content": "Compute expression \"1/(1 + exp(4*x))\".\n" }, { "name": "st(var, expr)", "content": "Store the value of the expression expr in an internal variable. var specifies the number\nof the variable where to store the value, and it is a value ranging from 0 to 9. The\nfunction returns the value stored in the internal variable. Note, Variables are\ncurrently not shared between expressions.\n" }, { "name": "tan(x)", "content": "Compute tangent of x.\n" }, { "name": "tanh(x)", "content": "Compute hyperbolic tangent of x.\n" }, { "name": "taylor(expr, x)", "content": "" }, { "name": "taylor(expr, x, id)", "content": "Evaluate a Taylor series at x, given an expression representing the ld(id)-th derivative\nof a function at 0.\n\nWhen the series does not converge the result is undefined.\n\nld(id) is used to represent the derivative order in expr, which means that the given\nexpression will be evaluated multiple times with various input values that the expression\ncan access through ld(id). If id is not specified then 0 is assumed.\n\nNote, when you have the derivatives at y instead of 0, \"taylor(expr, x-y)\" can be used.\n" }, { "name": "time(0)", "content": "Return the current (wallclock) time in seconds.\n" }, { "name": "trunc(expr)", "content": "Round the value of expression expr towards zero to the nearest integer. For example,\n\"trunc(-1.5)\" is \"-1.0\".\n" }, { "name": "while(cond, expr)", "content": "Evaluate expression expr while the expression cond is non-zero, and returns the value of\nthe last expr evaluation, or NAN if cond was always false.\n\nThe following constants are available:\n\nPI area of the unit disc, approximately 3.14\n\nE exp(1) (Euler's number), approximately 2.718\n\nPHI golden ratio (1+sqrt(5))/2, approximately 1.618\n\nAssuming that an expression is considered \"true\" if it has a non-zero value, note that:\n\n\"*\" works like AND\n\n\"+\" works like OR\n\nFor example the construct:\n\nif (A AND B) then C\n\nis equivalent to:\n\nif(A*B, C)\n\nIn your C code, you can extend the list of unary and binary functions, and define recognized\nconstants, so that they are available for your expressions.\n\nThe evaluator also recognizes the International System unit prefixes. If 'i' is appended\nafter the prefix, binary prefixes are used, which are based on powers of 1024 instead of\npowers of 1000. The 'B' postfix multiplies the value by 8, and can be appended after a unit\nprefix or used alone. This allows using for example 'KB', 'MiB', 'G' and 'B' as number\npostfix.\n\nThe list of available International System prefixes follows, with indication of the\ncorresponding powers of 10 and of 2.\n\ny 10^-24 / 2^-80\n\nz 10^-21 / 2^-70\n\na 10^-18 / 2^-60\n\nf 10^-15 / 2^-50\n\np 10^-12 / 2^-40\n\nn 10^-9 / 2^-30\n\nu 10^-6 / 2^-20\n\nm 10^-3 / 2^-10\n\nc 10^-2\n\nd 10^-1\n\nh 10^2\n\nk 10^3 / 2^10\n\nK 10^3 / 2^10\n\nM 10^6 / 2^20\n\nG 10^9 / 2^30\n\nT 10^12 / 2^40\n\nP 10^15 / 2^50\n\nE 10^18 / 2^60\n\nZ 10^21 / 2^70\n\nY 10^24 / 2^80\n" } ] }, "CODEC OPTIONS": { "content": "libavcodec provides some generic global options, which can be set on all the encoders and\ndecoders. In addition each codec may support so-called private options, which are specific\nfor a given codec.\n\nSometimes, a global option may only affect a specific kind of codec, and may be nonsensical\nor ignored by another, so you need to be aware of the meaning of the specified options. Also\nsome options are meant only for decoding or encoding.\n\nOptions may be set by specifying -option value in the FFmpeg tools, or by setting the value\nexplicitly in the \"AVCodecContext\" options or using the libavutil/opt.h API for programmatic\nuse.\n\nThe list of supported options follow:\n\nb integer (encoding,audio,video)\nSet bitrate in bits/s. Default value is 200K.\n\nab integer (encoding,audio)\nSet audio bitrate (in bits/s). Default value is 128K.\n\nbt integer (encoding,video)\nSet video bitrate tolerance (in bits/s). In 1-pass mode, bitrate tolerance specifies how\nfar ratecontrol is willing to deviate from the target average bitrate value. This is not\nrelated to min/max bitrate. Lowering tolerance too much has an adverse effect on quality.\n\nflags flags (decoding/encoding,audio,video,subtitles)\nSet generic flags.\n\nPossible values:\n\nmv4 Use four motion vector by macroblock (mpeg4).\n\nqpel\nUse 1/4 pel motion compensation.\n\nloop\nUse loop filter.\n\nqscale\nUse fixed qscale.\n\npass1\nUse internal 2pass ratecontrol in first pass mode.\n\npass2\nUse internal 2pass ratecontrol in second pass mode.\n\ngray\nOnly decode/encode grayscale.\n\npsnr\nSet error[?] variables during encoding.\n\ntruncated\nInput bitstream might be randomly truncated.\n\ndropchanged\nDon't output frames whose parameters differ from first decoded frame in stream.\nError AVERRORINPUTCHANGED is returned when a frame is dropped.\n\nildct\nUse interlaced DCT.\n\nlowdelay\nForce low delay.\n\nglobalheader\nPlace global headers in extradata instead of every keyframe.\n\nbitexact\nOnly write platform-, build- and time-independent data. (except (I)DCT). This\nensures that file and data checksums are reproducible and match between platforms.\nIts primary use is for regression testing.\n\naic Apply H263 advanced intra coding / mpeg4 ac prediction.\n\nilme\nApply interlaced motion estimation.\n\ncgop\nUse closed gop.\n\noutputcorrupt\nOutput even potentially corrupted frames.\n\ntimebase rational number\nSet codec time base.\n\nIt is the fundamental unit of time (in seconds) in terms of which frame timestamps are\nrepresented. For fixed-fps content, timebase should be \"1 / framerate\" and timestamp\nincrements should be identically 1.\n\ng integer (encoding,video)\nSet the group of picture (GOP) size. Default value is 12.\n\nar integer (decoding/encoding,audio)\nSet audio sampling rate (in Hz).\n\nac integer (decoding/encoding,audio)\nSet number of audio channels.\n\ncutoff integer (encoding,audio)\nSet cutoff bandwidth. (Supported only by selected encoders, see their respective\ndocumentation sections.)\n\nframesize integer (encoding,audio)\nSet audio frame size.\n\nEach submitted frame except the last must contain exactly framesize samples per channel.\nMay be 0 when the codec has CODECCAPVARIABLEFRAMESIZE set, in that case the frame\nsize is not restricted. It is set by some decoders to indicate constant frame size.\n\nframenumber integer\nSet the frame number.\n\ndelay integer\nqcomp float (encoding,video)\nSet video quantizer scale compression (VBR). It is used as a constant in the ratecontrol\nequation. Recommended range for default rceq: 0.0-1.0.\n\nqblur float (encoding,video)\nSet video quantizer scale blur (VBR).\n\nqmin integer (encoding,video)\nSet min video quantizer scale (VBR). Must be included between -1 and 69, default value is\n2.\n\nqmax integer (encoding,video)\nSet max video quantizer scale (VBR). Must be included between -1 and 1024, default value\nis 31.\n\nqdiff integer (encoding,video)\nSet max difference between the quantizer scale (VBR).\n\nbf integer (encoding,video)\nSet max number of B frames between non-B-frames.\n\nMust be an integer between -1 and 16. 0 means that B-frames are disabled. If a value of\n-1 is used, it will choose an automatic value depending on the encoder.\n\nDefault value is 0.\n\nbqfactor float (encoding,video)\nSet qp factor between P and B frames.\n\ncodectag integer\nbug flags (decoding,video)\nWorkaround not auto detected encoder bugs.\n\nPossible values:\n\nautodetect\nxvidilace\nXvid interlacing bug (autodetected if fourcc==XVIX)\n\nump4\n(autodetected if fourcc==UMP4)\n\nnopadding\npadding bug (autodetected)\n\namv\nqpelchroma\nstdqpel\nold standard qpel (autodetected per fourcc/version)\n\nqpelchroma2\ndirectblocksize\ndirect-qpel-blocksize bug (autodetected per fourcc/version)\n\nedge\nedge padding bug (autodetected per fourcc/version)\n\nhpelchroma\ndcclip\nms Workaround various bugs in microsoft broken decoders.\n\ntrunc\ntrancated frames\n\nstrict integer (decoding/encoding,audio,video)\nSpecify how strictly to follow the standards.\n\nPossible values:\n\nvery\nstrictly conform to an older more strict version of the spec or reference software\n\nstrict\nstrictly conform to all the things in the spec no matter what consequences\n\nnormal\nunofficial\nallow unofficial extensions\n\nexperimental\nallow non standardized experimental things, experimental (unfinished/work in\nprogress/not well tested) decoders and encoders. Note: experimental decoders can\npose a security risk, do not use this for decoding untrusted input.\n\nbqoffset float (encoding,video)\nSet QP offset between P and B frames.\n\nerrdetect flags (decoding,audio,video)\nSet error detection flags.\n\nPossible values:\n\ncrccheck\nverify embedded CRCs\n\nbitstream\ndetect bitstream specification deviations\n\nbuffer\ndetect improper bitstream length\n\nexplode\nabort decoding on minor error detection\n\nignoreerr\nignore decoding errors, and continue decoding. This is useful if you want to analyze\nthe content of a video and thus want everything to be decoded no matter what. This\noption will not result in a video that is pleasing to watch in case of errors.\n\ncareful\nconsider things that violate the spec and have not been seen in the wild as errors\n\ncompliant\nconsider all spec non compliancies as errors\n\naggressive\nconsider things that a sane encoder should not do as an error\n\nhasbframes integer\nblockalign integer\nrcoverridecount integer\nmaxrate integer (encoding,audio,video)\nSet max bitrate tolerance (in bits/s). Requires bufsize to be set.\n\nminrate integer (encoding,audio,video)\nSet min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of\nlittle use elsewise.\n\nbufsize integer (encoding,audio,video)\nSet ratecontrol buffer size (in bits).\n\niqfactor float (encoding,video)\nSet QP factor between P and I frames.\n\niqoffset float (encoding,video)\nSet QP offset between P and I frames.\n\ndct integer (encoding,video)\nSet DCT algorithm.\n\nPossible values:\n\nauto\nautoselect a good one (default)\n\nfastint\nfast integer\n\nint accurate integer\n\nmmx\naltivec\nfaan\nfloating point AAN DCT\n\nlumimask float (encoding,video)\nCompress bright areas stronger than medium ones.\n\ntcplxmask float (encoding,video)\nSet temporal complexity masking.\n\nscplxmask float (encoding,video)\nSet spatial complexity masking.\n\npmask float (encoding,video)\nSet inter masking.\n\ndarkmask float (encoding,video)\nCompress dark areas stronger than medium ones.\n\nidct integer (decoding/encoding,video)\nSelect IDCT implementation.\n\nPossible values:\n\nauto\nint\nsimple\nsimplemmx\nsimpleauto\nAutomatically pick a IDCT compatible with the simple one\n\narm\naltivec\nsh4\nsimplearm\nsimplearmv5te\nsimplearmv6\nsimpleneon\nxvid\nfaani\nfloating point AAN IDCT\n\nslicecount integer\nec flags (decoding,video)\nSet error concealment strategy.\n\nPossible values:\n\nguessmvs\niterative motion vector (MV) search (slow)\n\ndeblock\nuse strong deblock filter for damaged MBs\n\nfavorinter\nfavor predicting from the previous frame instead of the current\n\nbitspercodedsample integer\naspect rational number (encoding,video)\nSet sample aspect ratio.\n\nsar rational number (encoding,video)\nSet sample aspect ratio. Alias to aspect.\n\ndebug flags (decoding/encoding,audio,video,subtitles)\nPrint specific debug info.\n\nPossible values:\n\npict\npicture info\n\nrc rate control\n\nbitstream\nmbtype\nmacroblock (MB) type\n\nqp per-block quantization parameter (QP)\n\ndctcoeff\ngreenmetadata\ndisplay complexity metadata for the upcoming frame, GoP or for a given duration.\n\nskip\nstartcode\ner error recognition\n\nmmco\nmemory management control operations (H.264)\n\nbugs\nbuffers\npicture buffer allocations\n\nthreadops\nthreading operations\n\nnomc\nskip motion compensation\n\ncmp integer (encoding,video)\nSet full pel me compare function.\n\nPossible values:\n\nsad sum of absolute differences, fast (default)\n\nsse sum of squared errors\n\nsatd\nsum of absolute Hadamard transformed differences\n\ndct sum of absolute DCT transformed differences\n\npsnr\nsum of squared quantization errors (avoid, low quality)\n\nbit number of bits needed for the block\n\nrd rate distortion optimal, slow\n\nzero\n0\n\nvsad\nsum of absolute vertical differences\n\nvsse\nsum of squared vertical differences\n\nnsse\nnoise preserving sum of squared differences\n\nw53 5/3 wavelet, only used in snow\n\nw97 9/7 wavelet, only used in snow\n\ndctmax\nchroma\nsubcmp integer (encoding,video)\nSet sub pel me compare function.\n\nPossible values:\n\nsad sum of absolute differences, fast (default)\n\nsse sum of squared errors\n\nsatd\nsum of absolute Hadamard transformed differences\n\ndct sum of absolute DCT transformed differences\n\npsnr\nsum of squared quantization errors (avoid, low quality)\n\nbit number of bits needed for the block\n\nrd rate distortion optimal, slow\n\nzero\n0\n\nvsad\nsum of absolute vertical differences\n\nvsse\nsum of squared vertical differences\n\nnsse\nnoise preserving sum of squared differences\n\nw53 5/3 wavelet, only used in snow\n\nw97 9/7 wavelet, only used in snow\n\ndctmax\nchroma\nmbcmp integer (encoding,video)\nSet macroblock compare function.\n\nPossible values:\n\nsad sum of absolute differences, fast (default)\n\nsse sum of squared errors\n\nsatd\nsum of absolute Hadamard transformed differences\n\ndct sum of absolute DCT transformed differences\n\npsnr\nsum of squared quantization errors (avoid, low quality)\n\nbit number of bits needed for the block\n\nrd rate distortion optimal, slow\n\nzero\n0\n\nvsad\nsum of absolute vertical differences\n\nvsse\nsum of squared vertical differences\n\nnsse\nnoise preserving sum of squared differences\n\nw53 5/3 wavelet, only used in snow\n\nw97 9/7 wavelet, only used in snow\n\ndctmax\nchroma\nildctcmp integer (encoding,video)\nSet interlaced dct compare function.\n\nPossible values:\n\nsad sum of absolute differences, fast (default)\n\nsse sum of squared errors\n\nsatd\nsum of absolute Hadamard transformed differences\n\ndct sum of absolute DCT transformed differences\n\npsnr\nsum of squared quantization errors (avoid, low quality)\n\nbit number of bits needed for the block\n\nrd rate distortion optimal, slow\n\nzero\n0\n\nvsad\nsum of absolute vertical differences\n\nvsse\nsum of squared vertical differences\n\nnsse\nnoise preserving sum of squared differences\n\nw53 5/3 wavelet, only used in snow\n\nw97 9/7 wavelet, only used in snow\n\ndctmax\nchroma\ndiasize integer (encoding,video)\nSet diamond type & size for motion estimation.\n\n(1024, INTMAX)\nfull motion estimation(slowest)\n\n(768, 1024]\numh motion estimation\n\n(512, 768]\nhex motion estimation\n\n(256, 512]\nl2s diamond motion estimation\n\n[2,256]\nvar diamond motion estimation\n\n(-1, 2)\nsmall diamond motion estimation\n\n-1 funny diamond motion estimation\n\n(INTMIN, -1)\nsab diamond motion estimation\n\nlastpred integer (encoding,video)\nSet amount of motion predictors from the previous frame.\n\nprecmp integer (encoding,video)\nSet pre motion estimation compare function.\n\nPossible values:\n\nsad sum of absolute differences, fast (default)\n\nsse sum of squared errors\n\nsatd\nsum of absolute Hadamard transformed differences\n\ndct sum of absolute DCT transformed differences\n\npsnr\nsum of squared quantization errors (avoid, low quality)\n\nbit number of bits needed for the block\n\nrd rate distortion optimal, slow\n\nzero\n0\n\nvsad\nsum of absolute vertical differences\n\nvsse\nsum of squared vertical differences\n\nnsse\nnoise preserving sum of squared differences\n\nw53 5/3 wavelet, only used in snow\n\nw97 9/7 wavelet, only used in snow\n\ndctmax\nchroma\nprediasize integer (encoding,video)\nSet diamond type & size for motion estimation pre-pass.\n\nsubq integer (encoding,video)\nSet sub pel motion estimation quality.\n\nmerange integer (encoding,video)\nSet limit motion vectors range (1023 for DivX player).\n\nglobalquality integer (encoding,audio,video)\nsliceflags integer\nmbd integer (encoding,video)\nSet macroblock decision algorithm (high quality mode).\n\nPossible values:\n\nsimple\nuse mbcmp (default)\n\nbits\nuse fewest bits\n\nrd use best rate distortion\n\nrcinitoccupancy integer (encoding,video)\nSet number of bits which should be loaded into the rc buffer before decoding starts.\n\nflags2 flags (decoding/encoding,audio,video,subtitles)\nPossible values:\n\nfast\nAllow non spec compliant speedup tricks.\n\nnoout\nSkip bitstream encoding.\n\nignorecrop\nIgnore cropping information from sps.\n\nlocalheader\nPlace global headers at every keyframe instead of in extradata.\n\nchunks\nFrame data might be split into multiple chunks.\n\nshowall\nShow all frames before the first keyframe.\n\nexportmvs\nExport motion vectors into frame side-data (see \"AVFRAMEDATAMOTIONVECTORS\") for\ncodecs that support it. See also doc/examples/exportmvs.c.\n\nskipmanual\nDo not skip samples and export skip information as frame side data.\n\nassroflushnoop\nDo not reset ASS ReadOrder field on flush.\n\niccprofiles\nGenerate/parse embedded ICC profiles from/to colorimetry tags.\n\nexportsidedata flags (decoding/encoding,audio,video,subtitles)\nPossible values:\n\nmvs Export motion vectors into frame side-data (see \"AVFRAMEDATAMOTIONVECTORS\") for\ncodecs that support it. See also doc/examples/exportmvs.c.\n\nprft\nExport encoder Producer Reference Time into packet side-data (see \"AVPKTDATAPRFT\")\nfor codecs that support it.\n\nvencparams\nExport video encoding parameters through frame side data (see\n\"AVFRAMEDATAVIDEOENCPARAMS\") for codecs that support it. At present, those are\nH.264 and VP9.\n\nfilmgrain\nExport film grain parameters through frame side data (see\n\"AVFRAMEDATAFILMGRAINPARAMS\"). Supported at present by AV1 decoders.\n\nthreads integer (decoding/encoding,video)\nSet the number of threads to be used, in case the selected codec implementation supports\nmulti-threading.\n\nPossible values:\n\nauto, 0\nautomatically select the number of threads to set\n\nDefault value is auto.\n\ndc integer (encoding,video)\nSet intradcprecision.\n\nnssew integer (encoding,video)\nSet nsse weight.\n\nskiptop integer (decoding,video)\nSet number of macroblock rows at the top which are skipped.\n\nskipbottom integer (decoding,video)\nSet number of macroblock rows at the bottom which are skipped.\n\nprofile integer (encoding,audio,video)\nSet encoder codec profile. Default value is unknown. Encoder specific profiles are\ndocumented in the relevant encoder documentation.\n\nlevel integer (encoding,audio,video)\nSet the encoder level. This level depends on the specific codec, and might correspond to\nthe profile level. It is set by default to unknown.\n\nPossible values:\n\nunknown\nlowres integer (decoding,audio,video)\nDecode at 1= 1/2, 2=1/4, 3=1/8 resolutions.\n\nmblmin integer (encoding,video)\nSet min macroblock lagrange factor (VBR).\n\nmblmax integer (encoding,video)\nSet max macroblock lagrange factor (VBR).\n\nskiploopfilter integer (decoding,video)\nskipidct integer (decoding,video)\nskipframe integer (decoding,video)\nMake decoder discard processing depending on the frame type selected by the option value.\n\nskiploopfilter skips frame loop filtering, skipidct skips frame IDCT/dequantization,\nskipframe skips decoding.\n\nPossible values:\n\nnone\nDiscard no frame.\n\ndefault\nDiscard useless frames like 0-sized frames.\n\nnoref\nDiscard all non-reference frames.\n\nbidir\nDiscard all bidirectional frames.\n\nnokey\nDiscard all frames excepts keyframes.\n\nnointra\nDiscard all frames except I frames.\n\nall Discard all frames.\n\nDefault value is default.\n\nbidirrefine integer (encoding,video)\nRefine the two motion vectors used in bidirectional macroblocks.\n\nkeyintmin integer (encoding,video)\nSet minimum interval between IDR-frames.\n\nrefs integer (encoding,video)\nSet reference frames to consider for motion compensation.\n\ntrellis integer (encoding,audio,video)\nSet rate-distortion optimal quantization.\n\nmv0threshold integer (encoding,video)\ncompressionlevel integer (encoding,audio,video)\nbitsperrawsample integer\nchannellayout integer (decoding/encoding,audio)\nPossible values:\n\nrequestchannellayout integer (decoding,audio)\nPossible values:\n\nrcmaxvbvuse float (encoding,video)\nrcminvbvuse float (encoding,video)\ncolorprimaries integer (decoding/encoding,video)\nPossible values:\n\nbt709\nBT.709\n\nbt470m\nBT.470 M\n\nbt470bg\nBT.470 BG\n\nsmpte170m\nSMPTE 170 M\n\nsmpte240m\nSMPTE 240 M\n\nfilm\nFilm\n\nbt2020\nBT.2020\n\nsmpte428\nsmpte4281\nSMPTE ST 428-1\n\nsmpte431\nSMPTE 431-2\n\nsmpte432\nSMPTE 432-1\n\njedec-p22\nJEDEC P22\n\ncolortrc integer (decoding/encoding,video)\nPossible values:\n\nbt709\nBT.709\n\ngamma22\nBT.470 M\n\ngamma28\nBT.470 BG\n\nsmpte170m\nSMPTE 170 M\n\nsmpte240m\nSMPTE 240 M\n\nlinear\nLinear\n\nlog\nlog100\nLog\n\nlogsqrt\nlog316\nLog square root\n\niec6196624\niec61966-2-4\nIEC 61966-2-4\n\nbt1361\nbt1361e\nBT.1361\n\niec6196621\niec61966-2-1\nIEC 61966-2-1\n\nbt202010\nbt202010bit\nBT.2020 - 10 bit\n\nbt202012\nbt202012bit\nBT.2020 - 12 bit\n\nsmpte2084\nSMPTE ST 2084\n\nsmpte428\nsmpte4281\nSMPTE ST 428-1\n\narib-std-b67\nARIB STD-B67\n\ncolorspace integer (decoding/encoding,video)\nPossible values:\n\nrgb RGB\n\nbt709\nBT.709\n\nfcc FCC\n\nbt470bg\nBT.470 BG\n\nsmpte170m\nSMPTE 170 M\n\nsmpte240m\nSMPTE 240 M\n\nycocg\nYCOCG\n\nbt2020nc\nbt2020ncl\nBT.2020 NCL\n\nbt2020c\nbt2020cl\nBT.2020 CL\n\nsmpte2085\nSMPTE 2085\n\nchroma-derived-nc\nChroma-derived NCL\n\nchroma-derived-c\nChroma-derived CL\n\nictcp\nICtCp\n\ncolorrange integer (decoding/encoding,video)\nIf used as input parameter, it serves as a hint to the decoder, which colorrange the\ninput has. Possible values:\n\ntv\nmpeg\nlimited\nMPEG (219*2^(n-8))\n\npc\njpeg\nfull\nJPEG (2^n-1)\n\nchromasamplelocation integer (decoding/encoding,video)\nPossible values:\n\nleft\ncenter\ntopleft\ntop\nbottomleft\nbottom\nlogleveloffset integer\nSet the log level offset.\n\nslices integer (encoding,video)\nNumber of slices, used in parallelized encoding.\n\nthreadtype flags (decoding/encoding,video)\nSelect which multithreading methods to use.\n\nUse of frame will increase decoding delay by one frame per thread, so clients which\ncannot provide future frames should not use it.\n\nPossible values:\n\nslice\nDecode more than one part of a single frame at once.\n\nMultithreading using slices works only when the video was encoded with slices.\n\nframe\nDecode more than one frame at once.\n\nDefault value is slice+frame.\n\naudioservicetype integer (encoding,audio)\nSet audio service type.\n\nPossible values:\n\nma Main Audio Service\n\nef Effects\n\nvi Visually Impaired\n\nhi Hearing Impaired\n\ndi Dialogue\n\nco Commentary\n\nem Emergency\n\nvo Voice Over\n\nka Karaoke\n\nrequestsamplefmt samplefmt (decoding,audio)\nSet sample format audio decoders should prefer. Default value is \"none\".\n\npkttimebase rational number\nsubcharenc encoding (decoding,subtitles)\nSet the input subtitles character encoding.\n\nfieldorder fieldorder (video)\nSet/override the field order of the video. Possible values:\n\nprogressive\nProgressive video\n\ntt Interlaced video, top field coded and displayed first\n\nbb Interlaced video, bottom field coded and displayed first\n\ntb Interlaced video, top coded first, bottom displayed first\n\nbt Interlaced video, bottom coded first, top displayed first\n\nskipalpha bool (decoding,video)\nSet to 1 to disable processing alpha (transparency). This works like the gray flag in the\nflags option which skips chroma information instead of alpha. Default is 0.\n\ncodecwhitelist list (input)\n\",\" separated list of allowed decoders. By default all are allowed.\n\ndumpseparator string (input)\nSeparator used to separate the fields printed on the command line about the Stream\nparameters. For example, to separate the fields with newlines and indentation:\n\nffprobe -dumpseparator \"\n\" -i ~/videos/matrixbenchmpeg2.mpg\n\nmaxpixels integer (decoding/encoding,video)\nMaximum number of pixels per image. This value can be used to avoid out of memory\nfailures due to large images.\n\napplycropping bool (decoding,video)\nEnable cropping if cropping parameters are multiples of the required alignment for the\nleft and top parameters. If the alignment is not met the cropping will be partially\napplied to maintain alignment. Default is 1 (enabled). Note: The required alignment\ndepends on if \"AVCODECFLAGUNALIGNED\" is set and the CPU. \"AVCODECFLAGUNALIGNED\"\ncannot be changed from the command line. Also hardware decoders will not apply left/top\nCropping.\n", "subsections": [] }, "DECODERS": { "content": "Decoders are configured elements in FFmpeg which allow the decoding of multimedia streams.\n\nWhen you configure your FFmpeg build, all the supported native decoders are enabled by\ndefault. Decoders requiring an external library must be enabled manually via the\ncorresponding \"--enable-lib\" option. You can list all available decoders using the configure\noption \"--list-decoders\".\n\nYou can disable all the decoders with the configure option \"--disable-decoders\" and\nselectively enable / disable single decoders with the options \"--enable-decoder=DECODER\" /\n\"--disable-decoder=DECODER\".\n\nThe option \"-decoders\" of the ff* tools will display the list of enabled decoders.\n", "subsections": [] }, "VIDEO DECODERS": { "content": "A description of some of the currently available video decoders follows.\n", "subsections": [ { "name": "av1", "content": "AOMedia Video 1 (AV1) decoder.\n\nOptions\n" }, { "name": "operating_point", "content": "Select an operating point of a scalable AV1 bitstream (0 - 31). Default is 0.\n" }, { "name": "rawvideo", "content": "Raw video decoder.\n\nThis decoder decodes rawvideo streams.\n\nOptions\n\ntop topfieldfirst\nSpecify the assumed field type of the input video.\n\n-1 the video is assumed to be progressive (default)\n\n0 bottom-field-first is assumed\n\n1 top-field-first is assumed\n" }, { "name": "libdav1d", "content": "dav1d AV1 decoder.\n\nlibdav1d allows libavcodec to decode the AOMedia Video 1 (AV1) codec. Requires the presence\nof the libdav1d headers and library during configuration. You need to explicitly configure\nthe build with \"--enable-libdav1d\".\n\nOptions\n\nThe following options are supported by the libdav1d wrapper.\n" }, { "name": "framethreads", "content": "Set amount of frame threads to use during decoding. The default value is 0 (autodetect).\nThis option is deprecated for libdav1d >= 1.0 and will be removed in the future. Use the\noption \"maxframedelay\" and the global option \"threads\" instead.\n" }, { "name": "tilethreads", "content": "Set amount of tile threads to use during decoding. The default value is 0 (autodetect).\nThis option is deprecated for libdav1d >= 1.0 and will be removed in the future. Use the\nglobal option \"threads\" instead.\n" }, { "name": "max_frame_delay", "content": "Set max amount of frames the decoder may buffer internally. The default value is 0\n(autodetect).\n" }, { "name": "filmgrain", "content": "Apply film grain to the decoded video if present in the bitstream. Defaults to the\ninternal default of the library. This option is deprecated and will be removed in the\nfuture. See the global option \"exportsidedata\" to export Film Grain parameters instead\nof applying it.\n" }, { "name": "oppoint", "content": "Select an operating point of a scalable AV1 bitstream (0 - 31). Defaults to the internal\ndefault of the library.\n" }, { "name": "alllayers", "content": "Output all spatial layers of a scalable AV1 bitstream. The default value is false.\n" }, { "name": "libdavs2", "content": "AVS2-P2/IEEE1857.4 video decoder wrapper.\n\nThis decoder allows libavcodec to decode AVS2 streams with davs2 library.\n" }, { "name": "libuavs3d", "content": "AVS3-P2/IEEE1857.10 video decoder.\n\nlibuavs3d allows libavcodec to decode AVS3 streams. Requires the presence of the libuavs3d\nheaders and library during configuration. You need to explicitly configure the build with\n\"--enable-libuavs3d\".\n\nOptions\n\nThe following option is supported by the libuavs3d wrapper.\n" }, { "name": "frame_threads", "content": "Set amount of frame threads to use during decoding. The default value is 0 (autodetect).\n" }, { "name": "QSV Decoders", "content": "The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC, JPEG/MJPEG, VP8, VP9,\nAV1).\n\nCommon Options\n\nThe following options are supported by all qsv decoders.\n\nasyncdepth\nInternal parallelization depth, the higher the value the higher the latency.\n\ngpucopy\nA GPU-accelerated copy between video and system memory\n\ndefault\non\noff\n\nHEVC Options\n\nExtra options for hevcqsv.\n\nloadplugin\nA user plugin to load in an internal session\n\nnone\nhevcsw\nhevchw\nloadplugins\nA :-separate list of hexadecimal plugin UIDs to load in an internal session\n" }, { "name": "v210", "content": "Uncompressed 4:2:2 10-bit decoder.\n\nOptions\n" }, { "name": "custom_stride", "content": "Set the line size of the v210 data in bytes. The default value is 0 (autodetect). You can\nuse the special -1 value for a strideless v210 as seen in BOXX files.\n" } ] }, "AUDIO DECODERS": { "content": "A description of some of the currently available audio decoders follows.\n", "subsections": [ { "name": "ac3", "content": "AC-3 audio decoder.\n\nThis decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as well as the\nundocumented RealAudio 3 (a.k.a. dnet).\n\nAC-3 Decoder Options\n" }, { "name": "-drc_scale _", "content": "Dynamic Range Scale Factor. The factor to apply to dynamic range values from the AC-3\nstream. This factor is applied exponentially. The default value is 1. There are 3\nnotable scale factor ranges:\n\ndrcscale == 0\nDRC disabled. Produces full range audio.\n\n0 < drcscale <= 1\nDRC enabled. Applies a fraction of the stream DRC value. Audio reproduction is\nbetween full range and full compression.\n\ndrcscale > 1\nDRC enabled. Applies drcscale asymmetrically. Loud sounds are fully compressed.\nSoft sounds are enhanced.\n" }, { "name": "flac", "content": "FLAC audio decoder.\n\nThis decoder aims to implement the complete FLAC specification from Xiph.\n\nFLAC Decoder options\n" }, { "name": "-use_buggy_lpc", "content": "The lavc FLAC encoder used to produce buggy streams with high lpc values (like the\ndefault value). This option makes it possible to decode such streams correctly by using\nlavc's old buggy lpc logic for decoding.\n" }, { "name": "ffwavesynth", "content": "Internal wave synthesizer.\n\nThis decoder generates wave patterns according to predefined sequences. Its use is purely\ninternal and the format of the data it accepts is not publicly documented.\n" }, { "name": "libcelt", "content": "libcelt decoder wrapper.\n\nlibcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio codec. Requires the\npresence of the libcelt headers and library during configuration. You need to explicitly\nconfigure the build with \"--enable-libcelt\".\n" }, { "name": "libgsm", "content": "libgsm decoder wrapper.\n\nlibgsm allows libavcodec to decode the GSM full rate audio codec. Requires the presence of\nthe libgsm headers and library during configuration. You need to explicitly configure the\nbuild with \"--enable-libgsm\".\n\nThis decoder supports both the ordinary GSM and the Microsoft variant.\n" }, { "name": "libilbc", "content": "libilbc decoder wrapper.\n\nlibilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC) audio codec.\nRequires the presence of the libilbc headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libilbc\".\n\nOptions\n\nThe following option is supported by the libilbc wrapper.\n" }, { "name": "enhance", "content": "Enable the enhancement of the decoded audio when set to 1. The default value is 0\n(disabled).\n" }, { "name": "libopencore-amrnb", "content": "libopencore-amrnb decoder wrapper.\n\nlibopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate Narrowband audio codec.\nUsing it requires the presence of the libopencore-amrnb headers and library during\nconfiguration. You need to explicitly configure the build with \"--enable-libopencore-amrnb\".\n\nAn FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB without this library.\n" }, { "name": "libopencore-amrwb", "content": "libopencore-amrwb decoder wrapper.\n\nlibopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate Wideband audio codec.\nUsing it requires the presence of the libopencore-amrwb headers and library during\nconfiguration. You need to explicitly configure the build with \"--enable-libopencore-amrwb\".\n\nAn FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB without this library.\n" }, { "name": "libopus", "content": "libopus decoder wrapper.\n\nlibopus allows libavcodec to decode the Opus Interactive Audio Codec. Requires the presence\nof the libopus headers and library during configuration. You need to explicitly configure the\nbuild with \"--enable-libopus\".\n\nAn FFmpeg native decoder for Opus exists, so users can decode Opus without this library.\n" } ] }, "SUBTITLES DECODERS": { "content": "", "subsections": [ { "name": "libaribb24", "content": "ARIB STD-B24 caption decoder.\n\nImplements profiles A and C of the ARIB STD-B24 standard.\n\nlibaribb24 Decoder Options\n" }, { "name": "-aribb24-base-path _", "content": "Sets the base path for the libaribb24 library. This is utilized for reading of\nconfiguration files (for custom unicode conversions), and for dumping of non-text symbols\nas images under that location.\n\nUnset by default.\n" }, { "name": "-aribb24-skip-ruby-text _", "content": "Tells the decoder wrapper to skip text blocks that contain half-height ruby text.\n\nEnabled by default.\n" }, { "name": "libaribcaption", "content": "Yet another ARIB STD-B24 caption decoder using external libaribcaption library.\n\nImplements profiles A and C of the Japanse ARIB STD-B24 standard, Brazilian ABNT NBR 15606-1,\nand Philippines version of ISDB-T.\n\nRequires the presence of the libaribcaption headers and library\n() during configuration. You need to explicitly\nconfigure the build with \"--enable-libaribcaption\". If both libaribb24 and libaribcaption\nare enabled, libaribcaption decoder precedes.\n\nlibaribcaption Decoder Options\n" }, { "name": "-sub_type _", "content": "Specifies the format of the decoded subtitles.\n\nbitmap\nGraphical image.\n\nass ASS formatted text.\n\ntext\nSimple text based output without formatting.\n\nThe default is ass as same as libaribb24 decoder. Some present players (e.g., mpv)\nexpect ASS format for ARIB caption.\n" }, { "name": "-caption_encoding _", "content": "Specifies the encoding scheme of input subtitle text.\n\nauto\nAutomatically detect text encoding (default).\n\njis 8bit-char JIS encoding defined in ARIB STD B24. This encoding used in Japan for ISDB\ncaptions.\n\nutf8\nUTF-8 encoding defined in ARIB STD B24. This encoding is used in Philippines for\nISDB-T captions.\n\nlatin\nLatin character encoding defined in ABNT NBR 15606-1. This encoding is used in South\nAmerica for SBTVD / ISDB-Tb captions.\n" }, { "name": "-font _", "content": "Specify comma-separated list of font family names to be used for bitmap or ass type\nsubtitle rendering. Only first font name is used for ass type subtitle.\n\nIf not specified, use internaly defined default font family.\n" }, { "name": "-ass_single_rect _", "content": "ARIB STD-B24 specifies that some captions may be displayed at different positions at a\ntime (multi-rectangle subtitle). Since some players (e.g., old mpv) can't handle\nmultiple ASS rectangles in a single AVSubtitle, or multiple ASS rectangles of\nindeterminate duration with the same start timestamp, this option can change the behavior\nso that all the texts are displayed in a single ASS rectangle.\n\nThe default is false.\n\nIf your player cannot handle AVSubtitles with multiple ASS rectangles properly, set this\noption to true or define ASSSINGLERECT=1 to change default behavior at compilation.\n" }, { "name": "-force_outline_text _", "content": "Specify whether always render outline text for all characters regardless of the\nindication by charactor style.\n\nThe default is false.\n" }, { "name": "-outline_width _", "content": "Specify width for outline text, in dots (relative).\n\nThe default is 1.5.\n" }, { "name": "-ignore_background _", "content": "Specify whether to ignore background color rendering.\n\nThe default is false.\n" }, { "name": "-ignore_ruby _", "content": "Specify whether to ignore rendering for ruby-like (furigana) characters.\n\nThe default is false.\n" }, { "name": "-replace_drcs _", "content": "Specify whether to render replaced DRCS characters as Unicode characters.\n\nThe default is true.\n" }, { "name": "-replace_msz_ascii _", "content": "Specify whether to replace MSZ (Middle Size; half width) fullwidth alphanumerics with\nhalfwidth alphanumerics.\n\nThe default is true.\n" }, { "name": "-replace_msz_japanese _", "content": "Specify whether to replace some MSZ (Middle Size; half width) fullwidth japanese special\ncharacters with halfwidth ones.\n\nThe default is true.\n" }, { "name": "-replace_msz_glyph _", "content": "Specify whether to replace MSZ (Middle Size; half width) characters with halfwidth glyphs\nif the fonts supports it. This option works under FreeType or DirectWrite renderer with\nAdobe-Japan1 compliant fonts. e.g., IBM Plex Sans JP, Morisawa BIZ UDGothic, Morisawa\nBIZ UDMincho, Yu Gothic, Yu Mincho, and Meiryo.\n\nThe default is true.\n" }, { "name": "-canvas_size _", "content": "Specify the resolution of the canvas to render subtitles to; usually, this should be\nframe size of input video. This only applies when \"-subtitletype\" is set to bitmap.\n\nThe libaribcaption decoder assumes input frame size for bitmap rendering as below:\n\n1. PROFILEA : 1440 x 1080 with SAR (PAR) 4:3\n\n2. PROFILEC : 320 x 180 with SAR (PAR) 1:1\n\nIf actual frame size of input video does not match above assumption, the rendered\ncaptions may be distorted. To make the captions undistorted, add \"-canvassize\" option\nto specify actual input video size.\n\nNote that the \"-canvassize\" option is not required for video with different size but\nsame aspect ratio. In such cases, the caption will be stretched or shrunk to actual\nvideo size if \"-canvassize\" option is not specified. If \"-canvassize\" option is\nspecified with different size, the caption will be stretched or shrunk as specified size\nwith calculated SAR.\n\nlibaribcaption decoder usage examples\n\nDisplay MPEG-TS file with ARIB subtitle by \"ffplay\" tool:\n\nffplay -subtype bitmap MPEG.TS\n\nDisplay MPEG-TS file with input frame size 1920x1080 by \"ffplay\" tool:\n\nffplay -subtype bitmap -canvassize 1920x1080 MPEG.TS\n\nEmbed ARIB subtitle in transcoded video:\n\nffmpeg -subtype bitmap -i src.m2t -filtercomplex \"[0:v][0:s]overlay\" -vcodec h264 dest.mp4\n" }, { "name": "dvbsub", "content": "Options\n" }, { "name": "compute_clut", "content": "-2 Compute clut once if no matching CLUT is in the stream.\n\n-1 Compute clut if no matching CLUT is in the stream.\n\n0 Never compute CLUT\n\n1 Always compute CLUT and override the one provided in the stream.\n" }, { "name": "dvb_substream", "content": "Selects the dvb substream, or all substreams if -1 which is default.\n" }, { "name": "dvdsub", "content": "This codec decodes the bitmap subtitles used in DVDs; the same subtitles can also be found in\nVobSub file pairs and in some Matroska files.\n\nOptions\n" }, { "name": "palette", "content": "Specify the global palette used by the bitmaps. When stored in VobSub, the palette is\nnormally specified in the index file; in Matroska, the palette is stored in the codec\nextra-data in the same format as in VobSub. In DVDs, the palette is stored in the IFO\nfile, and therefore not available when reading from dumped VOB files.\n\nThe format for this option is a string containing 16 24-bits hexadecimal numbers (without\n0x prefix) separated by commas, for example \"0d00ee, ee450d, 101010, eaeaea, 0ce60b,\nec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b\".\n" }, { "name": "ifo_palette", "content": "Specify the IFO file from which the global palette is obtained. (experimental)\n" }, { "name": "forced_subs_only", "content": "Only decode subtitle entries marked as forced. Some titles have forced and non-forced\nsubtitles in the same track. Setting this flag to 1 will only keep the forced subtitles.\nDefault value is 0.\n" }, { "name": "libzvbi-teletext", "content": "Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext subtitles. Requires\nthe presence of the libzvbi headers and library during configuration. You need to explicitly\nconfigure the build with \"--enable-libzvbi\".\n\nOptions\n" }, { "name": "txt_page", "content": "List of teletext page numbers to decode. Pages that do not match the specified list are\ndropped. You may use the special \"*\" string to match all pages, or \"subtitle\" to match\nall subtitle pages. Default value is *.\n" }, { "name": "txt_default_region", "content": "Set default character set used for decoding, a value between 0 and 87 (see ETS 300 706,\nSection 15, Table 32). Default value is -1, which does not override the libzvbi default.\nThis option is needed for some legacy level 1.0 transmissions which cannot signal the\nproper charset.\n" }, { "name": "txt_chop_top", "content": "Discards the top teletext line. Default value is 1.\n" }, { "name": "txt_format", "content": "Specifies the format of the decoded subtitles.\n\nbitmap\nThe default format, you should use this for teletext pages, because certain graphics\nand colors cannot be expressed in simple text or even ASS.\n\ntext\nSimple text based output without formatting.\n\nass Formatted ASS output, subtitle pages and teletext pages are returned in different\nstyles, subtitle pages are stripped down to text, but an effort is made to keep the\ntext alignment and the formatting.\n" }, { "name": "txt_left", "content": "X offset of generated bitmaps, default is 0.\n" }, { "name": "txt_top", "content": "Y offset of generated bitmaps, default is 0.\n" }, { "name": "txt_chop_spaces", "content": "Chops leading and trailing spaces and removes empty lines from the generated text. This\noption is useful for teletext based subtitles where empty spaces may be present at the\nstart or at the end of the lines or empty lines may be present between the subtitle lines\nbecause of double-sized teletext characters. Default value is 1.\n" }, { "name": "txt_duration", "content": "Sets the display duration of the decoded teletext pages or subtitles in milliseconds.\nDefault value is -1 which means infinity or until the next subtitle event comes.\n" }, { "name": "txt_transparent", "content": "Force transparent background of the generated teletext bitmaps. Default value is 0 which\nmeans an opaque background.\n" }, { "name": "txt_opacity", "content": "Sets the opacity (0-255) of the teletext background. If txttransparent is not set, it\nonly affects characters between a start box and an end box, typically subtitles. Default\nvalue is 0 if txttransparent is set, 255 otherwise.\n" } ] }, "ENCODERS": { "content": "Encoders are configured elements in FFmpeg which allow the encoding of multimedia streams.\n\nWhen you configure your FFmpeg build, all the supported native encoders are enabled by\ndefault. Encoders requiring an external library must be enabled manually via the\ncorresponding \"--enable-lib\" option. You can list all available encoders using the configure\noption \"--list-encoders\".\n\nYou can disable all the encoders with the configure option \"--disable-encoders\" and\nselectively enable / disable single encoders with the options \"--enable-encoder=ENCODER\" /\n\"--disable-encoder=ENCODER\".\n\nThe option \"-encoders\" of the ff* tools will display the list of enabled encoders.\n", "subsections": [] }, "AUDIO ENCODERS": { "content": "A description of some of the currently available audio encoders follows.\n", "subsections": [ { "name": "aac", "content": "Advanced Audio Coding (AAC) encoder.\n\nThis encoder is the default AAC encoder, natively implemented into FFmpeg.\n\nOptions\n\nb Set bit rate in bits/s. Setting this automatically activates constant bit rate (CBR)\nmode. If this option is unspecified it is set to 128kbps.\n\nq Set quality for variable bit rate (VBR) mode. This option is valid only using the ffmpeg\ncommand-line tool. For library interface users, use globalquality.\n" }, { "name": "cutoff", "content": "Set cutoff frequency. If unspecified will allow the encoder to dynamically adjust the\ncutoff to improve clarity on low bitrates.\n" }, { "name": "aac_coder", "content": "Set AAC encoder coding method. Possible values:\n\ntwoloop\nTwo loop searching (TLS) method. This is the default method.\n\nThis method first sets quantizers depending on band thresholds and then tries to find\nan optimal combination by adding or subtracting a specific value from all quantizers\nand adjusting some individual quantizer a little. Will tune itself based on whether\naacis, aacms and aacpns are enabled.\n\nanmr\nAverage noise to mask ratio (ANMR) trellis-based solution.\n\nThis is an experimental coder which currently produces a lower quality, is more\nunstable and is slower than the default twoloop coder but has potential. Currently\nhas no support for the aacis or aacpns options. Not currently recommended.\n\nfast\nConstant quantizer method.\n\nUses a cheaper version of twoloop algorithm that doesn't try to do as many clever\nadjustments. Worse with low bitrates (less than 64kbps), but is better and much\nfaster at higher bitrates.\n" }, { "name": "aac_ms", "content": "Sets mid/side coding mode. The default value of \"auto\" will automatically use M/S with\nbands which will benefit from such coding. Can be forced for all bands using the value\n\"enable\", which is mainly useful for debugging or disabled using \"disable\".\n" }, { "name": "aac_is", "content": "Sets intensity stereo coding tool usage. By default, it's enabled and will automatically\ntoggle IS for similar pairs of stereo bands if it's beneficial. Can be disabled for\ndebugging by setting the value to \"disable\".\n" }, { "name": "aac_pns", "content": "Uses perceptual noise substitution to replace low entropy high frequency bands with\nimperceptible white noise during the decoding process. By default, it's enabled, but can\nbe disabled for debugging purposes by using \"disable\".\n" }, { "name": "aac_tns", "content": "Enables the use of a multitap FIR filter which spans through the high frequency bands to\nhide quantization noise during the encoding process and is reverted by the decoder. As\nwell as decreasing unpleasant artifacts in the high range this also reduces the entropy\nin the high bands and allows for more bits to be used by the mid-low bands. By default\nit's enabled but can be disabled for debugging by setting the option to \"disable\".\n" }, { "name": "aac_ltp", "content": "Enables the use of the long term prediction extension which increases coding efficiency\nin very low bandwidth situations such as encoding of voice or solo piano music by\nextending constant harmonic peaks in bands throughout frames. This option is implied by\nprofile:a aaclow and is incompatible with aacpred. Use in conjunction with -ar to\ndecrease the samplerate.\n" }, { "name": "aac_pred", "content": "Enables the use of a more traditional style of prediction where the spectral coefficients\ntransmitted are replaced by the difference of the current coefficients minus the previous\n\"predicted\" coefficients. In theory and sometimes in practice this can improve quality\nfor low to mid bitrate audio. This option implies the aacmain profile and is\nincompatible with aacltp.\n" }, { "name": "profile", "content": "Sets the encoding profile, possible values:\n\naaclow\nThe default, AAC \"Low-complexity\" profile. Is the most compatible and produces decent\nquality.\n\nmpeg2aaclow\nEquivalent to \"-profile:a aaclow -aacpns 0\". PNS was introduced with the MPEG4\nspecifications.\n\naacltp\nLong term prediction profile, is enabled by and will enable the aacltp option.\nIntroduced in MPEG4.\n\naacmain\nMain-type prediction profile, is enabled by and will enable the aacpred option.\nIntroduced in MPEG2.\n\nIf this option is unspecified it is set to aaclow.\n" }, { "name": "ac3 and ac3_fixed", "content": "AC-3 audio encoders.\n\nThese encoders implement part of ATSC A/52:2010 and ETSI TS 102 366, as well as the\nundocumented RealAudio 3 (a.k.a. dnet).\n\nThe ac3 encoder uses floating-point math, while the ac3fixed encoder only uses fixed-point\ninteger math. This does not mean that one is always faster, just that one or the other may be\nbetter suited to a particular system. The ac3fixed encoder is not the default codec for any\nof the output formats, so it must be specified explicitly using the option \"-acodec\nac3fixed\" in order to use it.\n\nAC-3 Metadata\n\nThe AC-3 metadata options are used to set parameters that describe the audio, but in most\ncases do not affect the audio encoding itself. Some of the options do directly affect or\ninfluence the decoding and playback of the resulting bitstream, while others are just for\ninformational purposes. A few of the options will add bits to the output stream that could\notherwise be used for audio data, and will thus affect the quality of the output. Those will\nbe indicated accordingly with a note in the option list below.\n\nThese parameters are described in detail in several publicly-available documents.\n\n*<>\n*<>\n*<>\n*<>\n\nMetadata Control Options\n" }, { "name": "-per_frame_metadata _", "content": "Allow Per-Frame Metadata. Specifies if the encoder should check for changing metadata for\neach frame.\n\n0 The metadata values set at initialization will be used for every frame in the stream.\n(default)\n\n1 Metadata values can be changed before encoding each frame.\n\nDownmix Levels\n" }, { "name": "-center_mixlev _", "content": "Center Mix Level. The amount of gain the decoder should apply to the center channel when\ndownmixing to stereo. This field will only be written to the bitstream if a center\nchannel is present. The value is specified as a scale factor. There are 3 valid values:\n\n0.707\nApply -3dB gain\n\n0.595\nApply -4.5dB gain (default)\n\n0.500\nApply -6dB gain\n" }, { "name": "-surround_mixlev _", "content": "Surround Mix Level. The amount of gain the decoder should apply to the surround\nchannel(s) when downmixing to stereo. This field will only be written to the bitstream if\none or more surround channels are present. The value is specified as a scale factor.\nThere are 3 valid values:\n\n0.707\nApply -3dB gain\n\n0.500\nApply -6dB gain (default)\n\n0.000\nSilence Surround Channel(s)\n\nAudio Production Information\n\nAudio Production Information is optional information describing the mixing environment.\nEither none or both of the fields are written to the bitstream.\n" }, { "name": "-mixing_level _", "content": "Mixing Level. Specifies peak sound pressure level (SPL) in the production environment\nwhen the mix was mastered. Valid values are 80 to 111, or -1 for unknown or not\nindicated. The default value is -1, but that value cannot be used if the Audio Production\nInformation is written to the bitstream. Therefore, if the \"roomtype\" option is not the\ndefault value, the \"mixinglevel\" option must not be -1.\n" }, { "name": "-room_type _", "content": "Room Type. Describes the equalization used during the final mixing session at the studio\nor on the dubbing stage. A large room is a dubbing stage with the industry standard\nX-curve equalization; a small room has flat equalization. This field will not be written\nto the bitstream if both the \"mixinglevel\" option and the \"roomtype\" option have the\ndefault values.\n\n0\nnotindicated\nNot Indicated (default)\n\n1\nlarge\nLarge Room\n\n2\nsmall\nSmall Room\n\nOther Metadata Options\n" }, { "name": "-copyright _", "content": "Copyright Indicator. Specifies whether a copyright exists for this audio.\n\n0\noff No Copyright Exists (default)\n\n1\non Copyright Exists\n" }, { "name": "-dialnorm _", "content": "Dialogue Normalization. Indicates how far the average dialogue level of the program is\nbelow digital 100% full scale (0 dBFS). This parameter determines a level shift during\naudio reproduction that sets the average volume of the dialogue to a preset level. The\ngoal is to match volume level between program sources. A value of -31dB will result in no\nvolume level change, relative to the source volume, during audio reproduction. Valid\nvalues are whole numbers in the range -31 to -1, with -31 being the default.\n" }, { "name": "-dsur_mode _", "content": "Dolby Surround Mode. Specifies whether the stereo signal uses Dolby Surround (Pro Logic).\nThis field will only be written to the bitstream if the audio stream is stereo. Using\nthis option does NOT mean the encoder will actually apply Dolby Surround processing.\n\n0\nnotindicated\nNot Indicated (default)\n\n1\noff Not Dolby Surround Encoded\n\n2\non Dolby Surround Encoded\n" }, { "name": "-original _", "content": "Original Bit Stream Indicator. Specifies whether this audio is from the original source\nand not a copy.\n\n0\noff Not Original Source\n\n1\non Original Source (default)\n\nExtended Bitstream Information\n\nThe extended bitstream options are part of the Alternate Bit Stream Syntax as specified in\nAnnex D of the A/52:2010 standard. It is grouped into 2 parts. If any one parameter in a\ngroup is specified, all values in that group will be written to the bitstream. Default\nvalues are used for those that are written but have not been specified. If the mixing levels\nare written, the decoder will use these values instead of the ones specified in the\n\"centermixlev\" and \"surroundmixlev\" options if it supports the Alternate Bit Stream Syntax.\n\nExtended Bitstream Information - Part 1\n" }, { "name": "-dmix_mode _", "content": "Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt (Dolby Surround) or\nLo/Ro (normal stereo) as the preferred stereo downmix mode.\n\n0\nnotindicated\nNot Indicated (default)\n\n1\nltrt\nLt/Rt Downmix Preferred\n\n2\nloro\nLo/Ro Downmix Preferred\n" }, { "name": "-ltrt_cmixlev _", "content": "Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the center channel\nwhen downmixing to stereo in Lt/Rt mode.\n\n1.414\nApply +3dB gain\n\n1.189\nApply +1.5dB gain\n\n1.000\nApply 0dB gain\n\n0.841\nApply -1.5dB gain\n\n0.707\nApply -3.0dB gain\n\n0.595\nApply -4.5dB gain (default)\n\n0.500\nApply -6.0dB gain\n\n0.000\nSilence Center Channel\n" }, { "name": "-ltrt_surmixlev _", "content": "Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the surround\nchannel(s) when downmixing to stereo in Lt/Rt mode.\n\n0.841\nApply -1.5dB gain\n\n0.707\nApply -3.0dB gain\n\n0.595\nApply -4.5dB gain\n\n0.500\nApply -6.0dB gain (default)\n\n0.000\nSilence Surround Channel(s)\n" }, { "name": "-loro_cmixlev _", "content": "Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the center channel\nwhen downmixing to stereo in Lo/Ro mode.\n\n1.414\nApply +3dB gain\n\n1.189\nApply +1.5dB gain\n\n1.000\nApply 0dB gain\n\n0.841\nApply -1.5dB gain\n\n0.707\nApply -3.0dB gain\n\n0.595\nApply -4.5dB gain (default)\n\n0.500\nApply -6.0dB gain\n\n0.000\nSilence Center Channel\n" }, { "name": "-loro_surmixlev _", "content": "Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the surround\nchannel(s) when downmixing to stereo in Lo/Ro mode.\n\n0.841\nApply -1.5dB gain\n\n0.707\nApply -3.0dB gain\n\n0.595\nApply -4.5dB gain\n\n0.500\nApply -6.0dB gain (default)\n\n0.000\nSilence Surround Channel(s)\n\nExtended Bitstream Information - Part 2\n" }, { "name": "-dsurex_mode _", "content": "Dolby Surround EX Mode. Indicates whether the stream uses Dolby Surround EX (7.1 matrixed\nto 5.1). Using this option does NOT mean the encoder will actually apply Dolby Surround\nEX processing.\n\n0\nnotindicated\nNot Indicated (default)\n\n1\non Dolby Surround EX Off\n\n2\noff Dolby Surround EX On\n" }, { "name": "-dheadphone_mode _", "content": "Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone encoding (multi-\nchannel matrixed to 2.0 for use with headphones). Using this option does NOT mean the\nencoder will actually apply Dolby Headphone processing.\n\n0\nnotindicated\nNot Indicated (default)\n\n1\non Dolby Headphone Off\n\n2\noff Dolby Headphone On\n" }, { "name": "-ad_conv_type _", "content": "A/D Converter Type. Indicates whether the audio has passed through HDCD A/D conversion.\n\n0\nstandard\nStandard A/D Converter (default)\n\n1\nhdcd\nHDCD A/D Converter\n\nOther AC-3 Encoding Options\n" }, { "name": "-stereo_rematrixing _", "content": "Stereo Rematrixing. Enables/Disables use of rematrixing for stereo input. This is an\noptional AC-3 feature that increases quality by selectively encoding the left/right\nchannels as mid/side. This option is enabled by default, and it is highly recommended\nthat it be left as enabled except for testing purposes.\n\ncutoff frequency\nSet lowpass cutoff frequency. If unspecified, the encoder selects a default determined by\nvarious other encoding parameters.\n\nFloating-Point-Only AC-3 Encoding Options\n\nThese options are only valid for the floating-point encoder and do not exist for the fixed-\npoint encoder due to the corresponding features not being implemented in fixed-point.\n" }, { "name": "-channel_coupling _", "content": "Enables/Disables use of channel coupling, which is an optional AC-3 feature that\nincreases quality by combining high frequency information from multiple channels into a\nsingle channel. The per-channel high frequency information is sent with less accuracy in\nboth the frequency and time domains. This allows more bits to be used for lower\nfrequencies while preserving enough information to reconstruct the high frequencies. This\noption is enabled by default for the floating-point encoder and should generally be left\nas enabled except for testing purposes or to increase encoding speed.\n\n-1\nauto\nSelected by Encoder (default)\n\n0\noff Disable Channel Coupling\n\n1\non Enable Channel Coupling\n" }, { "name": "-cpl_start_band _", "content": "Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a value\nhigher than the bandwidth is used, it will be reduced to 1 less than the coupling end\nband. If auto is used, the start band will be determined by the encoder based on the bit\nrate, sample rate, and channel layout. This option has no effect if channel coupling is\ndisabled.\n\n-1\nauto\nSelected by Encoder (default)\n" }, { "name": "flac", "content": "FLAC (Free Lossless Audio Codec) Encoder\n\nOptions\n\nThe following options are supported by FFmpeg's flac encoder.\n" }, { "name": "compression_level", "content": "Sets the compression level, which chooses defaults for many other options if they are not\nset explicitly. Valid values are from 0 to 12, 5 is the default.\n" }, { "name": "frame_size", "content": "Sets the size of the frames in samples per channel.\n" }, { "name": "lpc_coeff_precision", "content": "Sets the LPC coefficient precision, valid values are from 1 to 15, 15 is the default.\n" }, { "name": "lpc_type", "content": "Sets the first stage LPC algorithm\n\nnone\nLPC is not used\n\nfixed\nfixed LPC coefficients\n\nlevinson\ncholesky" }, { "name": "lpc_passes", "content": "Number of passes to use for Cholesky factorization during LPC analysis\n" }, { "name": "min_partition_order", "content": "The minimum partition order\n" }, { "name": "max_partition_order", "content": "The maximum partition order\n" }, { "name": "prediction_order_method", "content": "estimation\n2level\n4level\n8level\nsearch\nBruteforce search\n\nlog" }, { "name": "ch_mode", "content": "Channel mode\n\nauto\nThe mode is chosen automatically for each frame\n\nindep\nChannels are independently coded\n\nleftside\nrightside\nmidside" }, { "name": "exact_rice_parameters", "content": "Chooses if rice parameters are calculated exactly or approximately. if set to 1 then\nthey are chosen exactly, which slows the code down slightly and improves compression\nslightly.\n" }, { "name": "multi_dim_quant", "content": "Multi Dimensional Quantization. If set to 1 then a 2nd stage LPC algorithm is applied\nafter the first stage to finetune the coefficients. This is quite slow and slightly\nimproves compression.\n" }, { "name": "opus", "content": "Opus encoder.\n\nThis is a native FFmpeg encoder for the Opus format. Currently its in development and only\nimplements the CELT part of the codec. Its quality is usually worse and at best is equal to\nthe libopus encoder.\n\nOptions\n\nb Set bit rate in bits/s. If unspecified it uses the number of channels and the layout to\nmake a good guess.\n" }, { "name": "opus_delay", "content": "Sets the maximum delay in milliseconds. Lower delays than 20ms will very quickly decrease\nquality.\n" }, { "name": "libfdk_aac", "content": "libfdk-aac AAC (Advanced Audio Coding) encoder wrapper.\n\nThe libfdk-aac library is based on the Fraunhofer FDK AAC code from the Android project.\n\nRequires the presence of the libfdk-aac headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libfdk-aac\". The library is also incompatible\nwith GPL, so if you allow the use of GPL, you should configure with \"--enable-gpl\n--enable-nonfree --enable-libfdk-aac\".\n\nThis encoder has support for the AAC-HE profiles.\n\nVBR encoding, enabled through the vbr or flags +qscale options, is experimental and only\nworks with some combinations of parameters.\n\nSupport for encoding 7.1 audio is only available with libfdk-aac 0.1.3 or higher.\n\nFor more information see the fdk-aac project at\n.\n\nOptions\n\nThe following options are mapped on the shared FFmpeg codec options.\n\nb Set bit rate in bits/s. If the bitrate is not explicitly specified, it is automatically\nset to a suitable value depending on the selected profile.\n\nIn case VBR mode is enabled the option is ignored.\n\nar Set audio sampling rate (in Hz).\n" }, { "name": "channels", "content": "Set the number of audio channels.\n" }, { "name": "flags +qscale", "content": "Enable fixed quality, VBR (Variable Bit Rate) mode. Note that VBR is implicitly enabled\nwhen the vbr value is positive.\n" }, { "name": "cutoff", "content": "Set cutoff frequency. If not specified (or explicitly set to 0) it will use a value\nautomatically computed by the library. Default value is 0.\n" }, { "name": "profile", "content": "Set audio profile.\n\nThe following profiles are recognized:\n\naaclow\nLow Complexity AAC (LC)\n\naache\nHigh Efficiency AAC (HE-AAC)\n\naachev2\nHigh Efficiency AAC version 2 (HE-AACv2)\n\naacld\nLow Delay AAC (LD)\n\naaceld\nEnhanced Low Delay AAC (ELD)\n\nIf not specified it is set to aaclow.\n\nThe following are private options of the libfdkaac encoder.\n" }, { "name": "afterburner", "content": "Enable afterburner feature if set to 1, disabled if set to 0. This improves the quality\nbut also the required processing power.\n\nDefault value is 1.\n" }, { "name": "eld_sbr", "content": "Enable SBR (Spectral Band Replication) for ELD if set to 1, disabled if set to 0.\n\nDefault value is 0.\n" }, { "name": "eld_v2", "content": "Enable ELDv2 (LD-MPS extension for ELD stereo signals) for ELDv2 if set to 1, disabled if\nset to 0.\n\nNote that option is available when fdk-aac version\n(AACENCODERLIBVL0.AACENCODERLIBVL1.AACENCODERLIBVL2) > (4.0.0).\n\nDefault value is 0.\n" }, { "name": "signaling", "content": "Set SBR/PS signaling style.\n\nIt can assume one of the following values:\n\ndefault\nchoose signaling implicitly (explicit hierarchical by default, implicit if global\nheader is disabled)\n\nimplicit\nimplicit backwards compatible signaling\n\nexplicitsbr\nexplicit SBR, implicit PS signaling\n\nexplicithierarchical\nexplicit hierarchical signaling\n\nDefault value is default.\n" }, { "name": "latm", "content": "Output LATM/LOAS encapsulated data if set to 1, disabled if set to 0.\n\nDefault value is 0.\n" }, { "name": "header_period", "content": "Set StreamMuxConfig and PCE repetition period (in frames) for sending in-band\nconfiguration buffers within LATM/LOAS transport layer.\n\nMust be a 16-bits non-negative integer.\n\nDefault value is 0.\n\nvbr Set VBR mode, from 1 to 5. 1 is lowest quality (though still pretty good) and 5 is\nhighest quality. A value of 0 will disable VBR, and CBR (Constant Bit Rate) is enabled.\n\nCurrently only the aaclow profile supports VBR encoding.\n\nVBR modes 1-5 correspond to roughly the following average bit rates:\n\n1 32 kbps/channel\n\n2 40 kbps/channel\n\n3 48-56 kbps/channel\n\n4 64 kbps/channel\n\n5 about 80-96 kbps/channel\n\nDefault value is 0.\n" }, { "name": "frame_length", "content": "Set the audio frame length in samples. Default value is the internal default of the\nlibrary. Refer to the library's documentation for information about supported values.\n\nExamples\n\n• Use ffmpeg to convert an audio file to VBR AAC in an M4A (MP4) container:\n\nffmpeg -i input.wav -codec:a libfdkaac -vbr 3 output.m4a\n\n• Use ffmpeg to convert an audio file to CBR 64k kbps AAC, using the High-Efficiency AAC\nprofile:\n\nffmpeg -i input.wav -c:a libfdkaac -profile:a aache -b:a 64k output.m4a\n" }, { "name": "libmp3lame", "content": "LAME (Lame Ain't an MP3 Encoder) MP3 encoder wrapper.\n\nRequires the presence of the libmp3lame headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libmp3lame\".\n\nSee libshine for a fixed-point MP3 encoder, although with a lower quality.\n\nOptions\n\nThe following options are supported by the libmp3lame wrapper. The lame-equivalent of the\noptions are listed in parentheses.\n\nb (-b)\nSet bitrate expressed in bits/s for CBR or ABR. LAME \"bitrate\" is expressed in\nkilobits/s.\n\nq (-V)\nSet constant quality setting for VBR. This option is valid only using the ffmpeg command-\nline tool. For library interface users, use globalquality.\n\ncompressionlevel (-q)\nSet algorithm quality. Valid arguments are integers in the 0-9 range, with 0 meaning\nhighest quality but slowest, and 9 meaning fastest while producing the worst quality.\n\ncutoff (--lowpass)\nSet lowpass cutoff frequency. If unspecified, the encoder dynamically adjusts the cutoff.\n" }, { "name": "reservoir", "content": "Enable use of bit reservoir when set to 1. Default value is 1. LAME has this enabled by\ndefault, but can be overridden by use --nores option.\n\njointstereo (-m j)\nEnable the encoder to use (on a frame by frame basis) either L/R stereo or mid/side\nstereo. Default value is 1.\n\nabr (--abr)\nEnable the encoder to use ABR when set to 1. The lame --abr sets the target bitrate,\nwhile this options only tells FFmpeg to use ABR still relies on b to set bitrate.\n\ncopyright (-c)\nSet MPEG audio copyright flag when set to 1. The default value is 0 (disabled).\n\noriginal (-o)\nSet MPEG audio original flag when set to 1. The default value is 1 (enabled).\n" }, { "name": "libopencore-amrnb", "content": "OpenCORE Adaptive Multi-Rate Narrowband encoder.\n\nRequires the presence of the libopencore-amrnb headers and library during configuration. You\nneed to explicitly configure the build with \"--enable-libopencore-amrnb --enable-version3\".\n\nThis is a mono-only encoder. Officially it only supports 8000Hz sample rate, but you can\noverride it by setting strict to unofficial or lower.\n\nOptions\n\nb Set bitrate in bits per second. Only the following bitrates are supported, otherwise\nlibavcodec will round to the nearest valid bitrate.\n\n4750\n5150\n5900\n6700\n7400\n7950\n10200\n12200\ndtx Allow discontinuous transmission (generate comfort noise) when set to 1. The default\nvalue is 0 (disabled).\n" }, { "name": "libopus", "content": "libopus Opus Interactive Audio Codec encoder wrapper.\n\nRequires the presence of the libopus headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libopus\".\n\nOption Mapping\n\nMost libopus options are modelled after the opusenc utility from opus-tools. The following is\nan option mapping chart describing options supported by the libopus wrapper, and their\nopusenc-equivalent in parentheses.\n\nb (bitrate)\nSet the bit rate in bits/s. FFmpeg's b option is expressed in bits/s, while opusenc's\nbitrate in kilobits/s.\n\nvbr (vbr, hard-cbr, and cvbr)\nSet VBR mode. The FFmpeg vbr option has the following valid arguments, with the opusenc\nequivalent options in parentheses:\n\noff (hard-cbr)\nUse constant bit rate encoding.\n\non (vbr)\nUse variable bit rate encoding (the default).\n\nconstrained (cvbr)\nUse constrained variable bit rate encoding.\n\ncompressionlevel (comp)\nSet encoding algorithm complexity. Valid options are integers in the 0-10 range. 0 gives\nthe fastest encodes but lower quality, while 10 gives the highest quality but slowest\nencoding. The default is 10.\n\nframeduration (framesize)\nSet maximum frame size, or duration of a frame in milliseconds. The argument must be\nexactly the following: 2.5, 5, 10, 20, 40, 60. Smaller frame sizes achieve lower latency\nbut less quality at a given bitrate. Sizes greater than 20ms are only interesting at\nfairly low bitrates. The default is 20ms.\n\npacketloss (expect-loss)\nSet expected packet loss percentage. The default is 0.\n\nfec (n/a)\nEnable inband forward error correction. packetloss must be non-zero to take advantage -\nfrequency of FEC 'side-data' is proportional to expected packet loss. Default is\ndisabled.\n" }, { "name": "application (N.A.)", "content": "Set intended application type. Valid options are listed below:\n\nvoip\nFavor improved speech intelligibility.\n\naudio\nFavor faithfulness to the input (the default).\n\nlowdelay\nRestrict to only the lowest delay modes by disabling voice-optimized modes.\n" }, { "name": "cutoff (N.A.)", "content": "Set cutoff bandwidth in Hz. The argument must be exactly one of the following: 4000,\n6000, 8000, 12000, or 20000, corresponding to narrowband, mediumband, wideband, super\nwideband, and fullband respectively. The default is 0 (cutoff disabled). Note that\nlibopus forces a wideband cutoff for bitrates < 15 kbps, unless CELT-only (application\nset to lowdelay) mode is used.\n\nmappingfamily (mappingfamily)\nSet channel mapping family to be used by the encoder. The default value of -1 uses\nmapping family 0 for mono and stereo inputs, and mapping family 1 otherwise. The default\nalso disables the surround masking and LFE bandwidth optimzations in libopus, and\nrequires that the input contains 8 channels or fewer.\n\nOther values include 0 for mono and stereo, 1 for surround sound with masking and LFE\nbandwidth optimizations, and 255 for independent streams with an unspecified channel\nlayout.\n" }, { "name": "apply_phase_inv (N.A.) (requires libopus >= 1.2)", "content": "If set to 0, disables the use of phase inversion for intensity stereo, improving the\nquality of mono downmixes, but slightly reducing normal stereo quality. The default is 1\n(phase inversion enabled).\n" }, { "name": "libshine", "content": "Shine Fixed-Point MP3 encoder wrapper.\n\nShine is a fixed-point MP3 encoder. It has a far better performance on platforms without an\nFPU, e.g. armel CPUs, and some phones and tablets. However, as it is more targeted on\nperformance than quality, it is not on par with LAME and other production-grade encoders\nquality-wise. Also, according to the project's homepage, this encoder may not be free of bugs\nas the code was written a long time ago and the project was dead for at least 5 years.\n\nThis encoder only supports stereo and mono input. This is also CBR-only.\n\nThe original project (last updated in early 2007) is at\n. We only support the updated fork by the\nSavonet/Liquidsoap project at .\n\nRequires the presence of the libshine headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libshine\".\n\nSee also libmp3lame.\n\nOptions\n\nThe following options are supported by the libshine wrapper. The shineenc-equivalent of the\noptions are listed in parentheses.\n\nb (-b)\nSet bitrate expressed in bits/s for CBR. shineenc -b option is expressed in kilobits/s.\n" }, { "name": "libtwolame", "content": "TwoLAME MP2 encoder wrapper.\n\nRequires the presence of the libtwolame headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libtwolame\".\n\nOptions\n\nThe following options are supported by the libtwolame wrapper. The twolame-equivalent options\nfollow the FFmpeg ones and are in parentheses.\n\nb (-b)\nSet bitrate expressed in bits/s for CBR. twolame b option is expressed in kilobits/s.\nDefault value is 128k.\n\nq (-V)\nSet quality for experimental VBR support. Maximum value range is from -50 to 50, useful\nrange is from -10 to 10. The higher the value, the better the quality. This option is\nvalid only using the ffmpeg command-line tool. For library interface users, use\nglobalquality.\n\nmode (--mode)\nSet the mode of the resulting audio. Possible values:\n\nauto\nChoose mode automatically based on the input. This is the default.\n\nstereo\nStereo\n\njointstereo\nJoint stereo\n\ndualchannel\nDual channel\n\nmono\nMono\n\npsymodel (--psyc-mode)\nSet psychoacoustic model to use in encoding. The argument must be an integer between -1\nand 4, inclusive. The higher the value, the better the quality. The default value is 3.\n\nenergylevels (--energy)\nEnable energy levels extensions when set to 1. The default value is 0 (disabled).\n\nerrorprotection (--protect)\nEnable CRC error protection when set to 1. The default value is 0 (disabled).\n\ncopyright (--copyright)\nSet MPEG audio copyright flag when set to 1. The default value is 0 (disabled).\n\noriginal (--original)\nSet MPEG audio original flag when set to 1. The default value is 0 (disabled).\n" }, { "name": "libvo-amrwbenc", "content": "VisualOn Adaptive Multi-Rate Wideband encoder.\n\nRequires the presence of the libvo-amrwbenc headers and library during configuration. You\nneed to explicitly configure the build with \"--enable-libvo-amrwbenc --enable-version3\".\n\nThis is a mono-only encoder. Officially it only supports 16000Hz sample rate, but you can\noverride it by setting strict to unofficial or lower.\n\nOptions\n\nb Set bitrate in bits/s. Only the following bitrates are supported, otherwise libavcodec\nwill round to the nearest valid bitrate.\n\n6600\n8850\n12650\n14250\n15850\n18250\n19850\n23050\n23850\ndtx Allow discontinuous transmission (generate comfort noise) when set to 1. The default\nvalue is 0 (disabled).\n" }, { "name": "libvorbis", "content": "libvorbis encoder wrapper.\n\nRequires the presence of the libvorbisenc headers and library during configuration. You need\nto explicitly configure the build with \"--enable-libvorbis\".\n\nOptions\n\nThe following options are supported by the libvorbis wrapper. The oggenc-equivalent of the\noptions are listed in parentheses.\n\nTo get a more accurate and extensive documentation of the libvorbis options, consult the\nlibvorbisenc's and oggenc's documentations. See ,\n, and oggenc(1).\n\nb (-b)\nSet bitrate expressed in bits/s for ABR. oggenc -b is expressed in kilobits/s.\n\nq (-q)\nSet constant quality setting for VBR. The value should be a float number in the range of\n-1.0 to 10.0. The higher the value, the better the quality. The default value is 3.0.\n\nThis option is valid only using the ffmpeg command-line tool. For library interface\nusers, use globalquality.\n\ncutoff (--advanced-encode-option lowpassfrequency=N)\nSet cutoff bandwidth in Hz, a value of 0 disables cutoff. oggenc's related option is\nexpressed in kHz. The default value is 0 (cutoff disabled).\n\nminrate (-m)\nSet minimum bitrate expressed in bits/s. oggenc -m is expressed in kilobits/s.\n\nmaxrate (-M)\nSet maximum bitrate expressed in bits/s. oggenc -M is expressed in kilobits/s. This only\nhas effect on ABR mode.\n\niblock (--advanced-encode-option impulsenoisetune=N)\nSet noise floor bias for impulse blocks. The value is a float number from -15.0 to 0.0. A\nnegative bias instructs the encoder to pay special attention to the crispness of\ntransients in the encoded audio. The tradeoff for better transient response is a higher\nbitrate.\n" }, { "name": "mjpeg", "content": "Motion JPEG encoder.\n\nOptions\n" }, { "name": "huffman", "content": "Set the huffman encoding strategy. Possible values:\n\ndefault\nUse the default huffman tables. This is the default strategy.\n\noptimal\nCompute and use optimal huffman tables.\n" }, { "name": "wavpack", "content": "WavPack lossless audio encoder.\n\nOptions\n\nThe equivalent options for wavpack command line utility are listed in parentheses.\n\nShared options\n\nThe following shared options are effective for this encoder. Only special notes about this\nparticular encoder will be documented here. For the general meaning of the options, see the\nCodec Options chapter.\n\nframesize (--blocksize)\nFor this encoder, the range for this option is between 128 and 131072. Default is\nautomatically decided based on sample rate and number of channel.\n\nFor the complete formula of calculating default, see libavcodec/wavpackenc.c.\n\ncompressionlevel (-f, -h, -hh, and -x)\n\nPrivate options\n\njointstereo (-j)\nSet whether to enable joint stereo. Valid values are:\n\non (1)\nForce mid/side audio encoding.\n\noff (0)\nForce left/right audio encoding.\n\nauto\nLet the encoder decide automatically.\n" }, { "name": "optimize_mono", "content": "Set whether to enable optimization for mono. This option is only effective for non-mono\nstreams. Available values:\n\non enabled\n\noff disabled\n" } ] }, "VIDEO ENCODERS": { "content": "A description of some of the currently available video encoders follows.\n", "subsections": [ { "name": "a64_multi, a64_multi5", "content": "A64 / Commodore 64 multicolor charset encoder. \"a64multi5\" is extended with 5th color\n(colram).\n" }, { "name": "Cinepak", "content": "Cinepak aka CVID encoder. Compatible with Windows 3.1 and vintage MacOS.\n\nOptions\n\ng integer\nKeyframe interval. A keyframe is inserted at least every \"-g\" frames, sometimes sooner.\n\nq:v integer\nQuality factor. Lower is better. Higher gives lower bitrate. The following table lists\nbitrates when encoding akiyocif.y4m for various values of \"-q:v\" with \"-g 100\":\n\n\"-q:v 1\" 1918 kb/s\n\"-q:v 2\" 1735 kb/s\n\"-q:v 4\" 1500 kb/s\n\"-q:v 10\" 1041 kb/s\n\"-q:v 20\" 826 kb/s\n\"-q:v 40\" 553 kb/s\n\"-q:v 100\" 394 kb/s\n\"-q:v 200\" 312 kb/s\n\"-q:v 400\" 266 kb/s\n\"-q:v 1000\" 237 kb/s\nmaxextracbiterations integer\nMax extra codebook recalculation passes, more is better and slower.\n\nskipemptycb boolean\nAvoid wasting bytes, ignore vintage MacOS decoder.\n\nmaxstrips integer\nminstrips integer\nThe minimum and maximum number of strips to use. Wider range sometimes improves quality.\nMore strips is generally better quality but costs more bits. Fewer strips tend to yield\nmore keyframes. Vintage compatible is 1..3.\n\nstripnumberadaptivity integer\nHow much number of strips is allowed to change between frames. Higher is better but\nslower.\n\nGIF\nGIF image/animation encoder.\n\nOptions\n\ngifflags integer\nSets the flags used for GIF encoding.\n\noffsetting\nEnables picture offsetting.\n\nDefault is enabled.\n\ntransdiff\nEnables transparency detection between frames.\n\nDefault is enabled.\n\ngifimage integer\nEnables encoding one full GIF image per frame, rather than an animated GIF.\n\nDefault value is 0.\n\nglobalpalette integer\nWrites a palette to the global GIF header where feasible.\n\nIf disabled, every frame will always have a palette written, even if there is a global\npalette supplied.\n\nDefault value is 1.\n" }, { "name": "Hap", "content": "Vidvox Hap video encoder.\n\nOptions\n\nformat integer\nSpecifies the Hap format to encode.\n\nhap\nhapalpha\nhapq\n\nDefault value is hap.\n\nchunks integer\nSpecifies the number of chunks to split frames into, between 1 and 64. This permits\nmultithreaded decoding of large frames, potentially at the cost of data-rate. The encoder\nmay modify this value to divide frames evenly.\n\nDefault value is 1.\n\ncompressor integer\nSpecifies the second-stage compressor to use. If set to none, chunks will be limited to\n1, as chunked uncompressed frames offer no benefit.\n\nnone\nsnappy\n\nDefault value is snappy.\n" }, { "name": "jpeg2000", "content": "The native jpeg 2000 encoder is lossy by default, the \"-q:v\" option can be used to set the\nencoding quality. Lossless encoding can be selected with \"-pred 1\".\n\nOptions\n\nformat integer\nCan be set to either \"j2k\" or \"jp2\" (the default) that makes it possible to store non-rgb\npixfmts.\n\ntilewidth integer\nSets tile width. Range is 1 to 1073741824. Default is 256.\n\ntileheight integer\nSets tile height. Range is 1 to 1073741824. Default is 256.\n\npred integer\nAllows setting the discrete wavelet transform (DWT) type\n\ndwt97int (Lossy)\ndwt53 (Lossless)\n\nDefault is \"dwt97int\"\n\nsop boolean\nEnable this to add SOP marker at the start of each packet. Disabled by default.\n\neph boolean\nEnable this to add EPH marker at the end of each packet header. Disabled by default.\n\nprog integer\nSets the progression order to be used by the encoder. Possible values are:\n\nlrcp\nrlcp\nrpcl\npcrl\ncprl\n\nSet to \"lrcp\" by default.\n\nlayerrates string\nBy default, when this option is not used, compression is done using the quality metric.\nThis option allows for compression using compression ratio. The compression ratio for\neach level could be specified. The compression ratio of a layer \"l\" species the what\nratio of total file size is contained in the first \"l\" layers.\n\nExample usage:\n\nffmpeg -i input.bmp -c:v jpeg2000 -layerrates \"100,10,1\" output.j2k\n\nThis would compress the image to contain 3 layers, where the data contained in the first\nlayer would be compressed by 1000 times, compressed by 100 in the first two layers, and\nshall contain all data while using all 3 layers.\n" }, { "name": "librav1e", "content": "rav1e AV1 encoder wrapper.\n\nRequires the presence of the rav1e headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-librav1e\".\n\nOptions\n" }, { "name": "qmax", "content": "Sets the maximum quantizer to use when using bitrate mode.\n" }, { "name": "qmin", "content": "Sets the minimum quantizer to use when using bitrate mode.\n\nqp Uses quantizer mode to encode at the given quantizer (0-255).\n" }, { "name": "speed", "content": "Selects the speed preset (0-10) to encode with.\n" }, { "name": "tiles", "content": "Selects how many tiles to encode with.\n" }, { "name": "tile-rows", "content": "Selects how many rows of tiles to encode with.\n" }, { "name": "tile-columns", "content": "Selects how many columns of tiles to encode with.\n" }, { "name": "rav1e-params", "content": "Set rav1e options using a list of key=value pairs separated by \":\". See rav1e --help for\na list of options.\n\nFor example to specify librav1e encoding options with -rav1e-params:\n\nffmpeg -i input -c:v librav1e -b:v 500K -rav1e-params speed=5:lowlatency=true output.mp4\n" }, { "name": "libaom-av1", "content": "libaom AV1 encoder wrapper.\n\nRequires the presence of the libaom headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libaom\".\n\nOptions\n\nThe wrapper supports the following standard libavcodec options:\n\nb Set bitrate target in bits/second. By default this will use variable-bitrate mode. If\nmaxrate and minrate are also set to the same value then it will use constant-bitrate\nmode, otherwise if crf is set as well then it will use constrained-quality mode.\n" }, { "name": "g keyint_min", "content": "Set key frame placement. The GOP size sets the maximum distance between key frames; if\nzero the output stream will be intra-only. The minimum distance is ignored unless it is\nthe same as the GOP size, in which case key frames will always appear at a fixed\ninterval. Not set by default, so without this option the library has completely free\nchoice about where to place key frames.\n" }, { "name": "qmin qmax", "content": "Set minimum/maximum quantisation values. Valid range is from 0 to 63 (warning: this does\nnot match the quantiser values actually used by AV1 - divide by four to map real\nquantiser values to this range). Defaults to min/max (no constraint).\n" }, { "name": "minrate maxrate bufsize rc_init_occupancy", "content": "Set rate control buffering parameters. Not used if not set - defaults to unconstrained\nvariable bitrate.\n" }, { "name": "threads", "content": "Set the number of threads to use while encoding. This may require the tiles or row-mt\noptions to also be set to actually use the specified number of threads fully. Defaults to\nthe number of hardware threads supported by the host machine.\n" }, { "name": "profile", "content": "Set the encoding profile. Defaults to using the profile which matches the bit depth and\nchroma subsampling of the input.\n\nThe wrapper also has some specific options:\n" }, { "name": "cpu-used", "content": "Set the quality/encoding speed tradeoff. Valid range is from 0 to 8, higher numbers\nindicating greater speed and lower quality. The default value is 1, which will be slow\nand high quality.\n" }, { "name": "auto-alt-ref", "content": "Enable use of alternate reference frames. Defaults to the internal default of the\nlibrary.\n\narnr-max-frames (frames)\nSet altref noise reduction max frame count. Default is -1.\n\narnr-strength (strength)\nSet altref noise reduction filter strength. Range is -1 to 6. Default is -1.\n\naq-mode (aq-mode)\nSet adaptive quantization mode. Possible values:\n\nnone (0)\nDisabled.\n\nvariance (1)\nVariance-based.\n\ncomplexity (2)\nComplexity-based.\n\ncyclic (3)\nCyclic refresh.\n\ntune (tune)\nSet the distortion metric the encoder is tuned with. Default is \"psnr\".\n\npsnr (0)\nssim (1)" }, { "name": "lag-in-frames", "content": "Set the maximum number of frames which the encoder may keep in flight at any one time for\nlookahead purposes. Defaults to the internal default of the library.\n" }, { "name": "error-resilience", "content": "Enable error resilience features:\n\ndefault\nImprove resilience against losses of whole frames.\n\nNot enabled by default.\n\ncrf Set the quality/size tradeoff for constant-quality (no bitrate target) and constrained-\nquality (with maximum bitrate target) modes. Valid range is 0 to 63, higher numbers\nindicating lower quality and smaller output size. Only used if set; by default only the\nbitrate target is used.\n" }, { "name": "static-thresh", "content": "Set a change threshold on blocks below which they will be skipped by the encoder.\nDefined in arbitrary units as a nonnegative integer, defaulting to zero (no blocks are\nskipped).\n" }, { "name": "drop-threshold", "content": "Set a threshold for dropping frames when close to rate control bounds. Defined as a\npercentage of the target buffer - when the rate control buffer falls below this\npercentage, frames will be dropped until it has refilled above the threshold. Defaults\nto zero (no frames are dropped).\n\ndenoise-noise-level (level)\nAmount of noise to be removed for grain synthesis. Grain synthesis is disabled if this\noption is not set or set to 0.\n\ndenoise-block-size (pixels)\nBlock size used for denoising for grain synthesis. If not set, AV1 codec uses the default\nvalue of 32.\n\nundershoot-pct (pct)\nSet datarate undershoot (min) percentage of the target bitrate. Range is -1 to 100.\nDefault is -1.\n\novershoot-pct (pct)\nSet datarate overshoot (max) percentage of the target bitrate. Range is -1 to 1000.\nDefault is -1.\n\nminsection-pct (pct)\nMinimum percentage variation of the GOP bitrate from the target bitrate. If minsection-\npct is not set, the libaomenc wrapper computes it as follows: \"(minrate * 100 /\nbitrate)\". Range is -1 to 100. Default is -1 (unset).\n\nmaxsection-pct (pct)\nMaximum percentage variation of the GOP bitrate from the target bitrate. If maxsection-\npct is not set, the libaomenc wrapper computes it as follows: \"(maxrate * 100 /\nbitrate)\". Range is -1 to 5000. Default is -1 (unset).\n\nframe-parallel (boolean)\nEnable frame parallel decodability features. Default is true.\n" }, { "name": "tiles", "content": "Set the number of tiles to encode the input video with, as columns x rows. Larger\nnumbers allow greater parallelism in both encoding and decoding, but may decrease coding\nefficiency. Defaults to the minimum number of tiles required by the size of the input\nvideo (this is 1x1 (that is, a single tile) for sizes up to and including 4K).\n" }, { "name": "tile-columns tile-rows", "content": "Set the number of tiles as log2 of the number of tile rows and columns. Provided for\ncompatibility with libvpx/VP9.\n" }, { "name": "row-mt (Requires libaom >= 1.0.0-759-g90a15f4f2)", "content": "Enable row based multi-threading. Disabled by default.\n\nenable-cdef (boolean)\nEnable Constrained Directional Enhancement Filter. The libaom-av1 encoder enables CDEF by\ndefault.\n\nenable-restoration (boolean)\nEnable Loop Restoration Filter. Default is true for libaom-av1.\n\nenable-global-motion (boolean)\nEnable the use of global motion for block prediction. Default is true.\n\nenable-intrabc (boolean)\nEnable block copy mode for intra block prediction. This mode is useful for screen\ncontent. Default is true.\n\nenable-rect-partitions (boolean) (Requires libaom >= v2.0.0)\nEnable rectangular partitions. Default is true.\n\nenable-1to4-partitions (boolean) (Requires libaom >= v2.0.0)\nEnable 1:4/4:1 partitions. Default is true.\n\nenable-ab-partitions (boolean) (Requires libaom >= v2.0.0)\nEnable AB shape partitions. Default is true.\n\nenable-angle-delta (boolean) (Requires libaom >= v2.0.0)\nEnable angle delta intra prediction. Default is true.\n\nenable-cfl-intra (boolean) (Requires libaom >= v2.0.0)\nEnable chroma predicted from luma intra prediction. Default is true.\n\nenable-filter-intra (boolean) (Requires libaom >= v2.0.0)\nEnable filter intra predictor. Default is true.\n\nenable-intra-edge-filter (boolean) (Requires libaom >= v2.0.0)\nEnable intra edge filter. Default is true.\n\nenable-smooth-intra (boolean) (Requires libaom >= v2.0.0)\nEnable smooth intra prediction mode. Default is true.\n\nenable-paeth-intra (boolean) (Requires libaom >= v2.0.0)\nEnable paeth predictor in intra prediction. Default is true.\n\nenable-palette (boolean) (Requires libaom >= v2.0.0)\nEnable palette prediction mode. Default is true.\n\nenable-flip-idtx (boolean) (Requires libaom >= v2.0.0)\nEnable extended transform type, including FLIPADSTDCT, DCTFLIPADST, FLIPADSTFLIPADST,\nADSTFLIPADST, FLIPADSTADST, IDTX, VDCT, HDCT, VADST, HADST, VFLIPADST, HFLIPADST.\nDefault is true.\n\nenable-tx64 (boolean) (Requires libaom >= v2.0.0)\nEnable 64-pt transform. Default is true.\n\nreduced-tx-type-set (boolean) (Requires libaom >= v2.0.0)\nUse reduced set of transform types. Default is false.\n\nuse-intra-dct-only (boolean) (Requires libaom >= v2.0.0)\nUse DCT only for INTRA modes. Default is false.\n\nuse-inter-dct-only (boolean) (Requires libaom >= v2.0.0)\nUse DCT only for INTER modes. Default is false.\n\nuse-intra-default-tx-only (boolean) (Requires libaom >= v2.0.0)\nUse Default-transform only for INTRA modes. Default is false.\n\nenable-ref-frame-mvs (boolean) (Requires libaom >= v2.0.0)\nEnable temporal mv prediction. Default is true.\n\nenable-reduced-reference-set (boolean) (Requires libaom >= v2.0.0)\nUse reduced set of single and compound references. Default is false.\n\nenable-obmc (boolean) (Requires libaom >= v2.0.0)\nEnable obmc. Default is true.\n\nenable-dual-filter (boolean) (Requires libaom >= v2.0.0)\nEnable dual filter. Default is true.\n\nenable-diff-wtd-comp (boolean) (Requires libaom >= v2.0.0)\nEnable difference-weighted compound. Default is true.\n\nenable-dist-wtd-comp (boolean) (Requires libaom >= v2.0.0)\nEnable distance-weighted compound. Default is true.\n\nenable-onesided-comp (boolean) (Requires libaom >= v2.0.0)\nEnable one sided compound. Default is true.\n\nenable-interinter-wedge (boolean) (Requires libaom >= v2.0.0)\nEnable interinter wedge compound. Default is true.\n\nenable-interintra-wedge (boolean) (Requires libaom >= v2.0.0)\nEnable interintra wedge compound. Default is true.\n\nenable-masked-comp (boolean) (Requires libaom >= v2.0.0)\nEnable masked compound. Default is true.\n\nenable-interintra-comp (boolean) (Requires libaom >= v2.0.0)\nEnable interintra compound. Default is true.\n\nenable-smooth-interintra (boolean) (Requires libaom >= v2.0.0)\nEnable smooth interintra mode. Default is true.\n" }, { "name": "aom-params", "content": "Set libaom options using a list of key=value pairs separated by \":\". For a list of\nsupported options, see aomenc --help under the section \"AV1 Specific Options\".\n\nFor example to specify libaom encoding options with -aom-params:\n\nffmpeg -i input -c:v libaom-av1 -b:v 500K -aom-params tune=psnr:enable-tpl-model=1 output.mp4\n" }, { "name": "libsvtav1", "content": "SVT-AV1 encoder wrapper.\n\nRequires the presence of the SVT-AV1 headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libsvtav1\".\n\nOptions\n" }, { "name": "profile", "content": "Set the encoding profile.\n\nmain\nhigh\nprofessional" }, { "name": "level", "content": "Set the operating point level. For example: '4.0'\n" }, { "name": "hielevel", "content": "Set the Hierarchical prediction levels.\n\n3level\n4level\nThis is the default.\n" }, { "name": "tier", "content": "Set the operating point tier.\n\nmain\nThis is the default.\n\nhigh" }, { "name": "qmax", "content": "Set the maximum quantizer to use when using a bitrate mode.\n" }, { "name": "qmin", "content": "Set the minimum quantizer to use when using a bitrate mode.\n\ncrf Constant rate factor value used in crf rate control mode (0-63).\n\nqp Set the quantizer used in cqp rate control mode (0-63).\n" }, { "name": "sc_detection", "content": "Enable scene change detection.\n" }, { "name": "la_depth", "content": "Set number of frames to look ahead (0-120).\n" }, { "name": "preset", "content": "Set the quality-speed tradeoff, in the range 0 to 13. Higher values are faster but lower\nquality.\n" }, { "name": "tile_rows", "content": "Set log2 of the number of rows of tiles to use (0-6).\n" }, { "name": "tile_columns", "content": "Set log2 of the number of columns of tiles to use (0-4).\n" }, { "name": "svtav1-params", "content": "Set SVT-AV1 options using a list of key=value pairs separated by \":\". See the SVT-AV1\nencoder user guide for a list of accepted parameters.\n" }, { "name": "libjxl", "content": "libjxl JPEG XL encoder wrapper.\n\nRequires the presence of the libjxl headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libjxl\".\n\nOptions\n\nThe libjxl wrapper supports the following options:\n" }, { "name": "distance", "content": "Set the target Butteraugli distance. This is a quality setting: lower distance yields\nhigher quality, with distance=1.0 roughly comparable to libjpeg Quality 90 for\nphotographic content. Setting distance=0.0 yields true lossless encoding. Valid values\nrange between 0.0 and 15.0, and sane values rarely exceed 5.0. Setting distance=0.1\nusually attains transparency for most input. The default is 1.0.\n" }, { "name": "effort", "content": "Set the encoding effort used. Higher effort values produce more consistent quality and\nusually produces a better quality/bpp curve, at the cost of more CPU time required. Valid\nvalues range from 1 to 9, and the default is 7.\n" }, { "name": "modular", "content": "Force the encoder to use Modular mode instead of choosing automatically. The default is\nto use VarDCT for lossy encoding and Modular for lossless. VarDCT is generally superior\nto Modular for lossy encoding but does not support lossless encoding.\n" }, { "name": "libkvazaar", "content": "Kvazaar H.265/HEVC encoder.\n\nRequires the presence of the libkvazaar headers and library during configuration. You need to\nexplicitly configure the build with --enable-libkvazaar.\n\nOptions\n\nb Set target video bitrate in bit/s and enable rate control.\n" }, { "name": "kvazaar-params", "content": "Set kvazaar parameters as a list of name=value pairs separated by commas (,). See kvazaar\ndocumentation for a list of options.\n" }, { "name": "libopenh264", "content": "Cisco libopenh264 H.264/MPEG-4 AVC encoder wrapper.\n\nThis encoder requires the presence of the libopenh264 headers and library during\nconfiguration. You need to explicitly configure the build with \"--enable-libopenh264\". The\nlibrary is detected using pkg-config.\n\nFor more information about the library see .\n\nOptions\n\nThe following FFmpeg global options affect the configurations of the libopenh264 encoder.\n\nb Set the bitrate (as a number of bits per second).\n\ng Set the GOP size.\n" }, { "name": "maxrate", "content": "Set the max bitrate (as a number of bits per second).\n" }, { "name": "flags +global_header", "content": "Set global header in the bitstream.\n" }, { "name": "slices", "content": "Set the number of slices, used in parallelized encoding. Default value is 0. This is only\nused when slicemode is set to fixed.\n" }, { "name": "loopfilter", "content": "Enable loop filter, if set to 1 (automatically enabled). To disable set a value of 0.\n" }, { "name": "profile", "content": "Set profile restrictions. If set to the value of main enable CABAC (set the\n\"SEncParamExt.iEntropyCodingModeFlag\" flag to 1).\n" }, { "name": "max_nal_size", "content": "Set maximum NAL size in bytes.\n" }, { "name": "allow_skip_frames", "content": "Allow skipping frames to hit the target bitrate if set to 1.\n" }, { "name": "libtheora", "content": "libtheora Theora encoder wrapper.\n\nRequires the presence of the libtheora headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libtheora\".\n\nFor more information about the libtheora project see .\n\nOptions\n\nThe following global options are mapped to internal libtheora options which affect the\nquality and the bitrate of the encoded stream.\n\nb Set the video bitrate in bit/s for CBR (Constant Bit Rate) mode. In case VBR (Variable\nBit Rate) mode is enabled this option is ignored.\n" }, { "name": "flags", "content": "Used to enable constant quality mode (VBR) encoding through the qscale flag, and to\nenable the \"pass1\" and \"pass2\" modes.\n\ng Set the GOP size.\n" }, { "name": "global_quality", "content": "Set the global quality as an integer in lambda units.\n\nOnly relevant when VBR mode is enabled with \"flags +qscale\". The value is converted to QP\nunits by dividing it by \"FFQP2LAMBDA\", clipped in the [0 - 10] range, and then\nmultiplied by 6.3 to get a value in the native libtheora range [0-63]. A higher value\ncorresponds to a higher quality.\n\nq Enable VBR mode when set to a non-negative value, and set constant quality value as a\ndouble floating point value in QP units.\n\nThe value is clipped in the [0-10] range, and then multiplied by 6.3 to get a value in\nthe native libtheora range [0-63].\n\nThis option is valid only using the ffmpeg command-line tool. For library interface\nusers, use globalquality.\n\nExamples\n\n• Set maximum constant quality (VBR) encoding with ffmpeg:\n\nffmpeg -i INPUT -codec:v libtheora -q:v 10 OUTPUT.ogg\n\n• Use ffmpeg to convert a CBR 1000 kbps Theora video stream:\n\nffmpeg -i INPUT -codec:v libtheora -b:v 1000k OUTPUT.ogg\n" }, { "name": "libvpx", "content": "VP8/VP9 format supported through libvpx.\n\nRequires the presence of the libvpx headers and library during configuration. You need to\nexplicitly configure the build with \"--enable-libvpx\".\n\nOptions\n\nThe following options are supported by the libvpx wrapper. The vpxenc-equivalent options or\nvalues are listed in parentheses for easy migration.\n\nTo reduce the duplication of documentation, only the private options and some others\nrequiring special attention are documented here. For the documentation of the undocumented\ngeneric options, see the Codec Options chapter.\n\nTo get more documentation of the libvpx options, invoke the command ffmpeg -h encoder=libvpx,\nffmpeg -h encoder=libvpx-vp9 or vpxenc --help. Further information is available in the libvpx\nAPI documentation.\n\nb (target-bitrate)\nSet bitrate in bits/s. Note that FFmpeg's b option is expressed in bits/s, while vpxenc's\ntarget-bitrate is in kilobits/s.\n\ng (kf-max-dist)\nkeyintmin (kf-min-dist)\nqmin (min-q)\nMinimum (Best Quality) Quantizer.\n\nqmax (max-q)\nMaximum (Worst Quality) Quantizer. Can be changed per-frame.\n\nbufsize (buf-sz, buf-optimal-sz)\nSet ratecontrol buffer size (in bits). Note vpxenc's options are specified in\nmilliseconds, the libvpx wrapper converts this value as follows: \"buf-sz = bufsize * 1000\n/ bitrate\", \"buf-optimal-sz = bufsize * 1000 / bitrate * 5 / 6\".\n\nrcinitoccupancy (buf-initial-sz)\nSet number of bits which should be loaded into the rc buffer before decoding starts. Note\nvpxenc's option is specified in milliseconds, the libvpx wrapper converts this value as\nfollows: \"rcinitoccupancy * 1000 / bitrate\".\n" }, { "name": "undershoot-pct", "content": "Set datarate undershoot (min) percentage of the target bitrate.\n" }, { "name": "overshoot-pct", "content": "Set datarate overshoot (max) percentage of the target bitrate.\n\nskipthreshold (drop-frame)\nqcomp (bias-pct)\nmaxrate (maxsection-pct)\nSet GOP max bitrate in bits/s. Note vpxenc's option is specified as a percentage of the\ntarget bitrate, the libvpx wrapper converts this value as follows: \"(maxrate * 100 /\nbitrate)\".\n\nminrate (minsection-pct)\nSet GOP min bitrate in bits/s. Note vpxenc's option is specified as a percentage of the\ntarget bitrate, the libvpx wrapper converts this value as follows: \"(minrate * 100 /\nbitrate)\".\n\nminrate, maxrate, b end-usage=cbr\n\"(minrate == maxrate == bitrate)\".\n\ncrf (end-usage=cq, cq-level)\ntune (tune)\npsnr (psnr)\nssim (ssim)\nquality, deadline (deadline)\nbest\nUse best quality deadline. Poorly named and quite slow, this option should be avoided\nas it may give worse quality output than good.\n\ngood\nUse good quality deadline. This is a good trade-off between speed and quality when\nused with the cpu-used option.\n\nrealtime\nUse realtime quality deadline.\n\nspeed, cpu-used (cpu-used)\nSet quality/speed ratio modifier. Higher values speed up the encode at the cost of\nquality.\n\nnr (noise-sensitivity)" }, { "name": "static-thresh", "content": "Set a change threshold on blocks below which they will be skipped by the encoder.\n\nslices (token-parts)\nNote that FFmpeg's slices option gives the total number of partitions, while vpxenc's\ntoken-parts is given as log2(partitions).\n" }, { "name": "max-intra-rate", "content": "Set maximum I-frame bitrate as a percentage of the target bitrate. A value of 0 means\nunlimited.\n" }, { "name": "force_key_frames", "content": "\"VPXEFLAGFORCEKF\"\n" }, { "name": "Alternate reference frame related", "content": "auto-alt-ref\nEnable use of alternate reference frames (2-pass only). Values greater than 1 enable\nmulti-layer alternate reference frames (VP9 only).\n\narnr-maxframes\nSet altref noise reduction max frame count.\n\narnr-type\nSet altref noise reduction filter type: backward, forward, centered.\n\narnr-strength\nSet altref noise reduction filter strength.\n\nrc-lookahead, lag-in-frames (lag-in-frames)\nSet number of frames to look ahead for frametype and ratecontrol.\n\nmin-gf-interval\nSet minimum golden/alternate reference frame interval (VP9 only).\n" }, { "name": "error-resilient", "content": "Enable error resiliency features.\n\nsharpness integer\nIncrease sharpness at the expense of lower PSNR. The valid range is [0, 7].\n" }, { "name": "ts-parameters", "content": "Sets the temporal scalability configuration using a :-separated list of key=value pairs.\nFor example, to specify temporal scalability parameters with \"ffmpeg\":\n\nffmpeg -i INPUT -c:v libvpx -ts-parameters tsnumberlayers=3:\\\ntstargetbitrate=250,500,1000:tsratedecimator=4,2,1:\\\ntsperiodicity=4:tslayerid=0,2,1,2:tslayeringmode=3 OUTPUT\n\nBelow is a brief explanation of each of the parameters, please refer to \"struct\nvpxcodecenccfg\" in \"vpx/vpxencoder.h\" for more details.\n\ntsnumberlayers\nNumber of temporal coding layers.\n\ntstargetbitrate\nTarget bitrate for each temporal layer (in kbps). (bitrate should be inclusive of\nthe lower temporal layer).\n\ntsratedecimator\nFrame rate decimation factor for each temporal layer.\n\ntsperiodicity\nLength of the sequence defining frame temporal layer membership.\n\ntslayerid\nTemplate defining the membership of frames to temporal layers.\n\ntslayeringmode\n(optional) Selecting the temporal structure from a set of pre-defined temporal\nlayering modes. Currently supports the following options.\n\n0 No temporal layering flags are provided internally, relies on flags being passed\nin using \"metadata\" field in \"AVFrame\" with following keys.\n\nvp8-flags\nSets the flags passed into the encoder to indicate the referencing scheme for\nthe current frame. Refer to function \"vpxcodecencode\" in\n\"vpx/vpxencoder.h\" for more details.\n\ntemporalid\nExplicitly sets the temporal id of the current frame to encode.\n\n2 Two temporal layers. 0-1...\n\n3 Three temporal layers. 0-2-1-2...; with single reference frame.\n\n4 Same as option \"3\", except there is a dependency between the two temporal layer 2\nframes within the temporal period.\n" }, { "name": "VP9-specific options", "content": "lossless\nEnable lossless mode.\n\ntile-columns\nSet number of tile columns to use. Note this is given as log2(tilecolumns). For\nexample, 8 tile columns would be requested by setting the tile-columns option to 3.\n\ntile-rows\nSet number of tile rows to use. Note this is given as log2(tilerows). For example,\n4 tile rows would be requested by setting the tile-rows option to 2.\n\nframe-parallel\nEnable frame parallel decodability features.\n\naq-mode\nSet adaptive quantization mode (0: off (default), 1: variance 2: complexity, 3:\ncyclic refresh, 4: equator360).\n\ncolorspace color-space\nSet input color space. The VP9 bitstream supports signaling the following\ncolorspaces:\n\nrgb \u001b[4msRGB\nbt709 \u001b[4mbt709\nunspecified \u001b[4munknown\nbt470bg \u001b[4mbt601\nsmpte170m \u001b[4msmpte170\nsmpte240m \u001b[4msmpte240\nbt2020ncl \u001b[4mbt2020\nrow-mt boolean\nEnable row based multi-threading.\n\ntune-content\nSet content type: default (0), screen (1), film (2).\n\ncorpus-complexity\nCorpus VBR mode is a variant of standard VBR where the complexity distribution\nmidpoint is passed in rather than calculated for a specific clip or chunk.\n\nThe valid range is [0, 10000]. 0 (default) uses standard VBR.\n\nenable-tpl boolean\nEnable temporal dependency model.\n\nref-frame-config\nUsing per-frame metadata, set members of the structure \"vpxsvcrefframeconfigt\"\nin \"vpx/vp8cx.h\" to fine-control referencing schemes and frame buffer management.\nUse a :-separated list of key=value pairs. For example,\n\navdictset(&avframe->metadata, \"ref-frame-config\", \\\n\"rfcupdatebufferslot=7:rfclstfbidx=0:rfcgldfbidx=1:rfcaltfbidx=2:rfcreferencelast=0:rfcreferencegolden=0:rfcreferencealtref=0\");\n\nrfcupdatebufferslot\nIndicates the buffer slot number to update\n\nrfcupdatelast\nIndicates whether to update the LAST frame\n\nrfcupdategolden\nIndicates whether to update GOLDEN frame\n\nrfcupdatealtref\nIndicates whether to update ALTREF frame\n\nrfclstfbidx\nLAST frame buffer index\n\nrfcgldfbidx\nGOLDEN frame buffer index\n\nrfcaltfbidx\nALTREF frame buffer index\n\nrfcreferencelast\nIndicates whether to reference LAST frame\n\nrfcreferencegolden\nIndicates whether to reference GOLDEN frame\n\nrfcreferencealtref\nIndicates whether to reference ALTREF frame\n\nrfcreferenceduration\nIndicates frame duration\n\nFor more information about libvpx see: \n" }, { "name": "libwebp", "content": "libwebp WebP Image encoder wrapper\n\nlibwebp is Google's official encoder for WebP images. It can encode in either lossy or\nlossless mode. Lossy images are essentially a wrapper around a VP8 frame. Lossless images are\na separate codec developed by Google.\n\nPixel Format\n\nCurrently, libwebp only supports YUV420 for lossy and RGB for lossless due to limitations of\nthe format and libwebp. Alpha is supported for either mode. Because of API limitations, if\nRGB is passed in when encoding lossy or YUV is passed in for encoding lossless, the pixel\nformat will automatically be converted using functions from libwebp. This is not ideal and is\ndone only for convenience.\n\nOptions\n" }, { "name": "-lossless _", "content": "Enables/Disables use of lossless mode. Default is 0.\n" }, { "name": "-compression_level _", "content": "For lossy, this is a quality/speed tradeoff. Higher values give better quality for a\ngiven size at the cost of increased encoding time. For lossless, this is a size/speed\ntradeoff. Higher values give smaller size at the cost of increased encoding time. More\nspecifically, it controls the number of extra algorithms and compression tools used, and\nvaries the combination of these tools. This maps to the method option in libwebp. The\nvalid range is 0 to 6. Default is 4.\n" }, { "name": "-quality _", "content": "For lossy encoding, this controls image quality. For lossless encoding, this controls the\neffort and time spent in compression. Range is 0 to 100. Default is 75.\n" }, { "name": "-preset _", "content": "Configuration preset. This does some automatic settings based on the general type of the\nimage.\n\nnone\nDo not use a preset.\n\ndefault\nUse the encoder default.\n\npicture\nDigital picture, like portrait, inner shot\n\nphoto\nOutdoor photograph, with natural lighting\n\ndrawing\nHand or line drawing, with high-contrast details\n\nicon\nSmall-sized colorful images\n\ntext\nText-like\n" }, { "name": "libx264, libx264rgb", "content": "x264 H.264/MPEG-4 AVC encoder wrapper.\n\nThis encoder requires the presence of the libx264 headers and library during configuration.\nYou need to explicitly configure the build with \"--enable-libx264\".\n\nlibx264 supports an impressive number of features, including 8x8 and 4x4 adaptive spatial\ntransform, adaptive B-frame placement, CAVLC/CABAC entropy coding, interlacing (MBAFF),\nlossless mode, psy optimizations for detail retention (adaptive quantization, psy-RD, psy-\ntrellis).\n\nMany libx264 encoder options are mapped to FFmpeg global codec options, while unique encoder\noptions are provided through private options. Additionally the x264opts and x264-params\nprivate options allows one to pass a list of key=value tuples as accepted by the libx264\n\"x264paramparse\" function.\n\nThe x264 project website is at .\n\nThe libx264rgb encoder is the same as libx264, except it accepts packed RGB pixel formats as\ninput instead of YUV.\n\nSupported Pixel Formats\n\nx264 supports 8- to 10-bit color spaces. The exact bit depth is controlled at x264's\nconfigure time.\n\nOptions\n\nThe following options are supported by the libx264 wrapper. The x264-equivalent options or\nvalues are listed in parentheses for easy migration.\n\nTo reduce the duplication of documentation, only the private options and some others\nrequiring special attention are documented here. For the documentation of the undocumented\ngeneric options, see the Codec Options chapter.\n\nTo get a more accurate and extensive documentation of the libx264 options, invoke the command\nx264 --fullhelp or consult the libx264 documentation.\n\nb (bitrate)\nSet bitrate in bits/s. Note that FFmpeg's b option is expressed in bits/s, while x264's\nbitrate is in kilobits/s.\n\nbf (bframes)\ng (keyint)\nqmin (qpmin)\nMinimum quantizer scale.\n\nqmax (qpmax)\nMaximum quantizer scale.\n\nqdiff (qpstep)\nMaximum difference between quantizer scales.\n\nqblur (qblur)\nQuantizer curve blur\n\nqcomp (qcomp)\nQuantizer curve compression factor\n\nrefs (ref)\nNumber of reference frames each P-frame can use. The range is from 0-16.\n\nlevel (level)\nSet the \"x264paramt.ilevelidc\" value in case the value is positive, it is ignored\notherwise.\n\nThis value can be set using the \"AVCodecContext\" API (e.g. by setting the\n\"AVCodecContext\" value directly), and is specified as an integer mapped on a\ncorresponding level (e.g. the value 31 maps to H.264 level IDC \"3.1\", as defined in the\n\"x264levels\" table). It is ignored when set to a non positive value.\n\nAlternatively it can be set as a private option, overriding the value set in\n\"AVCodecContext\", and in this case must be specified as the level IDC identifier (e.g.\n\"3.1\"), as defined by H.264 Annex A.\n\nscthreshold (scenecut)\nSets the threshold for the scene change detection.\n\ntrellis (trellis)\nPerforms Trellis quantization to increase efficiency. Enabled by default.\n\nnr (nr)\nmerange (merange)\nMaximum range of the motion search in pixels.\n\nmemethod (me)\nSet motion estimation method. Possible values in the decreasing order of speed:\n\ndia (dia)\nepzs (dia)\nDiamond search with radius 1 (fastest). epzs is an alias for dia.\n\nhex (hex)\nHexagonal search with radius 2.\n\numh (umh)\nUneven multi-hexagon search.\n\nesa (esa)\nExhaustive search.\n\ntesa (tesa)\nHadamard exhaustive search (slowest).\n" }, { "name": "forced-idr", "content": "Normally, when forcing a I-frame type, the encoder can select any type of I-frame. This\noption forces it to choose an IDR-frame.\n\nsubq (subme)\nSub-pixel motion estimation method.\n\nbstrategy (b-adapt)\nAdaptive B-frame placement decision algorithm. Use only on first-pass.\n\nkeyintmin (min-keyint)\nMinimum GOP size.\n" }, { "name": "coder", "content": "Set entropy encoder. Possible values:\n\nac Enable CABAC.\n\nvlc Enable CAVLC and disable CABAC. It generates the same effect as x264's --no-cabac\noption.\n\ncmp Set full pixel motion estimation comparison algorithm. Possible values:\n\nchroma\nEnable chroma in motion estimation.\n\nsad Ignore chroma in motion estimation. It generates the same effect as x264's\n--no-chroma-me option.\n\nthreads (threads)\nNumber of encoding threads.\n" }, { "name": "thread_type", "content": "Set multithreading technique. Possible values:\n\nslice\nSlice-based multithreading. It generates the same effect as x264's --sliced-threads\noption.\n\nframe\nFrame-based multithreading.\n" }, { "name": "flags", "content": "Set encoding flags. It can be used to disable closed GOP and enable open GOP by setting\nit to \"-cgop\". The result is similar to the behavior of x264's --open-gop option.\n\nrcinitoccupancy (vbv-init)\npreset (preset)\nSet the encoding preset.\n\ntune (tune)\nSet tuning of the encoding params.\n\nprofile (profile)\nSet profile restrictions.\n" }, { "name": "fastfirstpass", "content": "Enable fast settings when encoding first pass, when set to 1. When set to 0, it has the\nsame effect of x264's --slow-firstpass option.\n\ncrf (crf)\nSet the quality for constant quality mode.\n\ncrfmax (crf-max)\nIn CRF mode, prevents VBV from lowering quality beyond this point.\n\nqp (qp)\nSet constant quantization rate control method parameter.\n\naq-mode (aq-mode)\nSet AQ method. Possible values:\n\nnone (0)\nDisabled.\n\nvariance (1)\nVariance AQ (complexity mask).\n\nautovariance (2)\nAuto-variance AQ (experimental).\n\naq-strength (aq-strength)\nSet AQ strength, reduce blocking and blurring in flat and textured areas.\n\npsy Use psychovisual optimizations when set to 1. When set to 0, it has the same effect as\nx264's --no-psy option.\n\npsy-rd (psy-rd)\nSet strength of psychovisual optimization, in psy-rd:psy-trellis format.\n\nrc-lookahead (rc-lookahead)\nSet number of frames to look ahead for frametype and ratecontrol.\n" }, { "name": "weightb", "content": "Enable weighted prediction for B-frames when set to 1. When set to 0, it has the same\neffect as x264's --no-weightb option.\n\nweightp (weightp)\nSet weighted prediction method for P-frames. Possible values:\n\nnone (0)\nDisabled\n\nsimple (1)\nEnable only weighted refs\n\nsmart (2)\nEnable both weighted refs and duplicates\n\nssim (ssim)\nEnable calculation and printing SSIM stats after the encoding.\n\nintra-refresh (intra-refresh)\nEnable the use of Periodic Intra Refresh instead of IDR frames when set to 1.\n\navcintra-class (class)\nConfigure the encoder to generate AVC-Intra. Valid values are 50,100 and 200\n\nbluray-compat (bluray-compat)\nConfigure the encoder to be compatible with the bluray standard. It is a shorthand for\nsetting \"bluray-compat=1 force-cfr=1\".\n\nb-bias (b-bias)\nSet the influence on how often B-frames are used.\n\nb-pyramid (b-pyramid)\nSet method for keeping of some B-frames as references. Possible values:\n\nnone (none)\nDisabled.\n\nstrict (strict)\nStrictly hierarchical pyramid.\n\nnormal (normal)\nNon-strict (not Blu-ray compatible).\n" }, { "name": "mixed-refs", "content": "Enable the use of one reference per partition, as opposed to one reference per macroblock\nwhen set to 1. When set to 0, it has the same effect as x264's --no-mixed-refs option.\n" }, { "name": "8x8dct", "content": "Enable adaptive spatial transform (high profile 8x8 transform) when set to 1. When set to\n0, it has the same effect as x264's --no-8x8dct option.\n" }, { "name": "fast-pskip", "content": "Enable early SKIP detection on P-frames when set to 1. When set to 0, it has the same\neffect as x264's --no-fast-pskip option.\n\naud (aud)\nEnable use of access unit delimiters when set to 1.\n" }, { "name": "mbtree", "content": "Enable use macroblock tree ratecontrol when set to 1. When set to 0, it has the same\neffect as x264's --no-mbtree option.\n\ndeblock (deblock)\nSet loop filter parameters, in alpha:beta form.\n\ncplxblur (cplxblur)\nSet fluctuations reduction in QP (before curve compression).\n\npartitions (partitions)\nSet partitions to consider as a comma-separated list of. Possible values in the list:\n\np8x8\n8x8 P-frame partition.\n\np4x4\n4x4 P-frame partition.\n\nb8x8\n4x4 B-frame partition.\n\ni8x8\n8x8 I-frame partition.\n\ni4x4\n4x4 I-frame partition. (Enabling p4x4 requires p8x8 to be enabled. Enabling i8x8\nrequires adaptive spatial transform (8x8dct option) to be enabled.)\n\nnone (none)\nDo not consider any partitions.\n\nall (all)\nConsider every partition.\n\ndirect-pred (direct)\nSet direct MV prediction mode. Possible values:\n\nnone (none)\nDisable MV prediction.\n\nspatial (spatial)\nEnable spatial predicting.\n\ntemporal (temporal)\nEnable temporal predicting.\n\nauto (auto)\nAutomatically decided.\n\nslice-max-size (slice-max-size)\nSet the limit of the size of each slice in bytes. If not specified but RTP payload size\n(ps) is specified, that is used.\n\nstats (stats)\nSet the file name for multi-pass stats.\n\nnal-hrd (nal-hrd)\nSet signal HRD information (requires vbv-bufsize to be set). Possible values:\n\nnone (none)\nDisable HRD information signaling.\n\nvbr (vbr)\nVariable bit rate.\n\ncbr (cbr)\nConstant bit rate (not allowed in MP4 container).\n" }, { "name": "x264opts (N.A.)", "content": "Set any x264 option, see x264 --fullhelp for a list.\n\nArgument is a list of key=value couples separated by \":\". In filter and psy-rd options\nthat use \":\" as a separator themselves, use \",\" instead. They accept it as well since\nlong ago but this is kept undocumented for some reason.\n\nFor example to specify libx264 encoding options with ffmpeg:\n\nffmpeg -i foo.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20 -an out.mkv\n\na53cc boolean\nImport closed captions (which must be ATSC compatible format) into output. Only the\nmpeg2 and h264 decoders provide these. Default is 1 (on).\n\nudusei boolean\nImport user data unregistered SEI if available into output. Default is 0 (off).\n\nmbinfo boolean\nSet mbinfo data through AVFrameSideData, only useful when used from the API. Default is\n0 (off).\n" }, { "name": "x264-params (N.A.)", "content": "Override the x264 configuration using a :-separated list of key=value parameters.\n\nThis option is functionally the same as the x264opts, but is duplicated for compatibility\nwith the Libav fork.\n\nFor example to specify libx264 encoding options with ffmpeg:\n\nffmpeg -i INPUT -c:v libx264 -x264-params level=30:bframes=0:weightp=0:\\\ncabac=0:ref=1:vbv-maxrate=768:vbv-bufsize=2000:analyse=all:me=umh:\\\nno-fast-pskip=1:subq=6:8x8dct=0:trellis=0 OUTPUT\n\nEncoding ffpresets for common usages are provided so they can be used with the general\npresets system (e.g. passing the pre option).\n" }, { "name": "libx265", "content": "x265 H.265/HEVC encoder wrapper.\n\nThis encoder requires the presence of the libx265 headers and library during configuration.\nYou need to explicitly configure the build with --enable-libx265.\n\nOptions\n\nb Sets target video bitrate.\n\nbf\ng Set the GOP size.\n" }, { "name": "keyint_min", "content": "Minimum GOP size.\n" }, { "name": "refs", "content": "Number of reference frames each P-frame can use. The range is from 1-16.\n" }, { "name": "preset", "content": "Set the x265 preset.\n" }, { "name": "tune", "content": "Set the x265 tune parameter.\n" }, { "name": "profile", "content": "Set profile restrictions.\n\ncrf Set the quality for constant quality mode.\n\nqp Set constant quantization rate control method parameter.\n" }, { "name": "qmin", "content": "Minimum quantizer scale.\n" }, { "name": "qmax", "content": "Maximum quantizer scale.\n" }, { "name": "qdiff", "content": "Maximum difference between quantizer scales.\n" }, { "name": "qblur", "content": "Quantizer curve blur\n" }, { "name": "qcomp", "content": "Quantizer curve compression factor\n" }, { "name": "i_qfactor", "content": "" }, { "name": "b_qfactor", "content": "" }, { "name": "forced-idr", "content": "Normally, when forcing a I-frame type, the encoder can select any type of I-frame. This\noption forces it to choose an IDR-frame.\n\nudusei boolean\nImport user data unregistered SEI if available into output. Default is 0 (off).\n" }, { "name": "x265-params", "content": "Set x265 options using a list of key=value couples separated by \":\". See x265 --help for\na list of options.\n\nFor example to specify libx265 encoding options with -x265-params:\n\nffmpeg -i input -c:v libx265 -x265-params crf=26:psy-rd=1 output.mp4\n" }, { "name": "libxavs2", "content": "xavs2 AVS2-P2/IEEE1857.4 encoder wrapper.\n\nThis encoder requires the presence of the libxavs2 headers and library during configuration.\nYou need to explicitly configure the build with --enable-libxavs2.\n\nThe following standard libavcodec options are used:\n\n• b / bitrate\n\n• g / gopsize\n\n• bf / maxbframes\n\nThe encoder also has its own specific options:\n\nOptions\n" }, { "name": "lcu_row_threads", "content": "Set the number of parallel threads for rows from 1 to 8 (default 5).\n" }, { "name": "initial_qp", "content": "Set the xavs2 quantization parameter from 1 to 63 (default 34). This is used to set the\ninitial qp for the first frame.\n\nqp Set the xavs2 quantization parameter from 1 to 63 (default 34). This is used to set the\nqp value under constant-QP mode.\n" }, { "name": "max_qp", "content": "Set the max qp for rate control from 1 to 63 (default 55).\n" }, { "name": "min_qp", "content": "Set the min qp for rate control from 1 to 63 (default 20).\n" }, { "name": "speed_level", "content": "Set the Speed level from 0 to 9 (default 0). Higher is better but slower.\n" }, { "name": "log_level", "content": "Set the log level from -1 to 3 (default 0). -1: none, 0: error, 1: warning, 2: info, 3:\ndebug.\n" }, { "name": "xavs2-params", "content": "Set xavs2 options using a list of key=value couples separated by \":\".\n\nFor example to specify libxavs2 encoding options with -xavs2-params:\n\nffmpeg -i input -c:v libxavs2 -xavs2-params RdoqLevel=0 output.avs2\n" }, { "name": "libxvid", "content": "Xvid MPEG-4 Part 2 encoder wrapper.\n\nThis encoder requires the presence of the libxvidcore headers and library during\nconfiguration. You need to explicitly configure the build with \"--enable-libxvid\n--enable-gpl\".\n\nThe native \"mpeg4\" encoder supports the MPEG-4 Part 2 format, so users can encode to this\nformat without this library.\n\nOptions\n\nThe following options are supported by the libxvid wrapper. Some of the following options are\nlisted but are not documented, and correspond to shared codec options. See the Codec Options\nchapter for their documentation. The other shared options which are not listed have no effect\nfor the libxvid encoder.\n\nb\ng" }, { "name": "qmin", "content": "" }, { "name": "qmax", "content": "" }, { "name": "mpeg_quant", "content": "" }, { "name": "threads", "content": "bf" }, { "name": "b_qfactor", "content": "" }, { "name": "b_qoffset", "content": "" }, { "name": "flags", "content": "Set specific encoding flags. Possible values:\n\nmv4 Use four motion vector by macroblock.\n\naic Enable high quality AC prediction.\n\ngray\nOnly encode grayscale.\n\ngmc Enable the use of global motion compensation (GMC).\n\nqpel\nEnable quarter-pixel motion compensation.\n\ncgop\nEnable closed GOP.\n\nglobalheader\nPlace global headers in extradata instead of every keyframe.\n" }, { "name": "trellis", "content": "" }, { "name": "me_quality", "content": "Set motion estimation quality level. Possible values in decreasing order of speed and\nincreasing order of quality:\n\n0 Use no motion estimation (default).\n\n1, 2\nEnable advanced diamond zonal search for 16x16 blocks and half-pixel refinement for\n16x16 blocks.\n\n3, 4\nEnable all of the things described above, plus advanced diamond zonal search for 8x8\nblocks and half-pixel refinement for 8x8 blocks, also enable motion estimation on\nchroma planes for P and B-frames.\n\n5, 6\nEnable all of the things described above, plus extended 16x16 and 8x8 blocks search.\n\nmbd Set macroblock decision algorithm. Possible values in the increasing order of quality:\n\nsimple\nUse macroblock comparing function algorithm (default).\n\nbits\nEnable rate distortion-based half pixel and quarter pixel refinement for 16x16\nblocks.\n\nrd Enable all of the things described above, plus rate distortion-based half pixel and\nquarter pixel refinement for 8x8 blocks, and rate distortion-based search using\nsquare pattern.\n" }, { "name": "lumi_aq", "content": "Enable lumi masking adaptive quantization when set to 1. Default is 0 (disabled).\n" }, { "name": "variance_aq", "content": "Enable variance adaptive quantization when set to 1. Default is 0 (disabled).\n\nWhen combined with lumiaq, the resulting quality will not be better than any of the two\nspecified individually. In other words, the resulting quality will be the worse one of\nthe two effects.\n" }, { "name": "ssim", "content": "Set structural similarity (SSIM) displaying method. Possible values:\n\noff Disable displaying of SSIM information.\n\navg Output average SSIM at the end of encoding to stdout. The format of showing the\naverage SSIM is:\n\nAverage SSIM: %f\n\nFor users who are not familiar with C, %f means a float number, or a decimal (e.g.\n0.939232).\n\nframe\nOutput both per-frame SSIM data during encoding and average SSIM at the end of\nencoding to stdout. The format of per-frame information is:\n\nSSIM: avg: %1.3f min: %1.3f max: %1.3f\n\nFor users who are not familiar with C, %1.3f means a float number rounded to 3 digits\nafter the dot (e.g. 0.932).\n" }, { "name": "ssim_acc", "content": "Set SSIM accuracy. Valid options are integers within the range of 0-4, while 0 gives the\nmost accurate result and 4 computes the fastest.\n" }, { "name": "MediaFoundation", "content": "This provides wrappers to encoders (both audio and video) in the MediaFoundation framework.\nIt can access both SW and HW encoders. Video encoders can take input in either of nv12 or\nyuv420p form (some encoders support both, some support only either - in practice, nv12 is the\nsafer choice, especially among HW encoders).\n" }, { "name": "Microsoft RLE", "content": "Microsoft RLE aka MSRLE encoder. Only 8-bit palette mode supported. Compatible with Windows\n3.1 and Windows 95.\n\nOptions\n\ng integer\nKeyframe interval. A keyframe is inserted at least every \"-g\" frames, sometimes sooner.\n" }, { "name": "mpeg2", "content": "MPEG-2 video encoder.\n\nOptions\n" }, { "name": "profile", "content": "Select the mpeg2 profile to encode:\n\n422\nhigh\nss Spatially Scalable\n\nsnr SNR Scalable\n\nmain\nsimple" }, { "name": "level", "content": "Select the mpeg2 level to encode:\n\nhigh\nhigh1440\nmain\nlow\nseqdispext integer\nSpecifies if the encoder should write a sequencedisplayextension to the output.\n\n-1\nauto\nDecide automatically to write it or not (this is the default) by checking if the data\nto be written is different from the default or unspecified values.\n\n0\nnever\nNever write it.\n\n1\nalways\nAlways write it.\n\nvideoformat integer\nSpecifies the videoformat written into the sequence display extension indicating the\nsource of the video pictures. The default is unspecified, can be component, pal, ntsc,\nsecam or mac. For maximum compatibility, use component.\n\na53cc boolean\nImport closed captions (which must be ATSC compatible format) into output. Default is 1\n(on).\n" }, { "name": "png", "content": "PNG image encoder.\n\nPrivate options\n\ndpi integer\nSet physical density of pixels, in dots per inch, unset by default\n\ndpm integer\nSet physical density of pixels, in dots per meter, unset by default\n" }, { "name": "ProRes", "content": "Apple ProRes encoder.\n\nFFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder. The used encoder can\nbe chosen with the \"-vcodec\" option.\n\nPrivate Options for prores-ks\n\nprofile integer\nSelect the ProRes profile to encode\n\nproxy\nlt\nstandard\nhq\n4444\n4444xq\nquantmat integer\nSelect quantization matrix.\n\nauto\ndefault\nproxy\nlt\nstandard\nhq\n\nIf set to auto, the matrix matching the profile will be picked. If not set, the matrix\nproviding the highest quality, default, will be picked.\n\nbitspermb integer\nHow many bits to allot for coding one macroblock. Different profiles use between 200 and\n2400 bits per macroblock, the maximum is 8000.\n\nmbsperslice integer\nNumber of macroblocks in each slice (1-8); the default value (8) should be good in almost\nall situations.\n\nvendor string\nOverride the 4-byte vendor ID. A custom vendor ID like apl0 would claim the stream was\nproduced by the Apple encoder.\n\nalphabits integer\nSpecify number of bits for alpha component. Possible values are 0, 8 and 16. Use 0 to\ndisable alpha plane coding.\n\nSpeed considerations\n\nIn the default mode of operation the encoder has to honor frame constraints (i.e. not produce\nframes with size bigger than requested) while still making output picture as good as\npossible. A frame containing a lot of small details is harder to compress and the encoder\nwould spend more time searching for appropriate quantizers for each slice.\n\nSetting a higher bitspermb limit will improve the speed.\n\nFor the fastest encoding speed set the qscale parameter (4 is the recommended value) and do\nnot set a size constraint.\n" }, { "name": "QSV Encoders", "content": "The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC, JPEG/MJPEG, VP9, AV1)\n\nRatecontrol Method\n\nThe ratecontrol method is selected as follows:\n\n• When globalquality is specified, a quality-based mode is used. Specifically this means\neither\n\n- CQP - constant quantizer scale, when the qscale codec flag is also set (the -qscale\nffmpeg option).\n\n- LAICQ - intelligent constant quality with lookahead, when the lookahead option is\nalso set.\n\n- ICQ -- intelligent constant quality otherwise. For the ICQ modes, global quality\nrange is 1 to 51, with 1 being the best quality.\n\n• Otherwise, a bitrate-based mode is used. For all of those, you should specify at least\nthe desired average bitrate with the b option.\n\n- LA - VBR with lookahead, when the lookahead option is specified.\n\n- VCM - video conferencing mode, when the vcm option is set.\n\n- CBR - constant bitrate, when maxrate is specified and equal to the average bitrate.\n\n- VBR - variable bitrate, when maxrate is specified, but is higher than the average\nbitrate.\n\n- AVBR - average VBR mode, when maxrate is not specified, both avbraccuracy and\navbrconvergence are set to non-zero. This mode is available for H264 and HEVC on\nWindows.\n\nNote that depending on your system, a different mode than the one you specified may be\nselected by the encoder. Set the verbosity level to verbose or higher to see the actual\nsettings used by the QSV runtime.\n\nGlobal Options -> MSDK Options\n\nAdditional libavcodec global options are mapped to MSDK options as follows:\n\n• g/gopsize -> GopPicSize\n\n• bf/maxbframes+1 -> GopRefDist\n\n• rcinitoccupancy/rcinitialbufferoccupancy -> InitialDelayInKB\n\n• slices -> NumSlice\n\n• refs -> NumRefFrame\n\n• bstrategy/bframestrategy -> BRefType\n\n• cgop/CLOSEDGOP codec flag -> GopOptFlag\n\n• For the CQP mode, the iqfactor/iqoffset and bqfactor/bqoffset set the difference\nbetween QPP and QPI, and QPP and QPB respectively.\n\n• Setting the coder option to the value vlc will make the H.264 encoder use CAVLC instead\nof CABAC.\n\nCommon Options\n\nFollowing options are used by all qsv encoders.\n\nasyncdepth\nSpecifies how many asynchronous operations an application performs before the application\nexplicitly synchronizes the result. If zero, the value is not specified.\n\npreset\nThis option itemizes a range of choices from veryfast (best speed) to veryslow (best\nquality).\n\nveryfast\nfaster\nfast\nmedium\nslow\nslower\nveryslow\nforcedidr\nForcing I frames as IDR frames.\n\nlowpower\nFor encoders set this flag to ON to reduce power consumption and GPU usage.\n\nRuntime Options\n\nFollowing options can be used durning qsv encoding.\n\nglobalquality\niquantfactor\niquantoffset\nbquantfactor\nbquantoffset\nSupported in h264qsv and hevcqsv. Change these value to reset qsv codec's qp\nconfiguration.\n\nmaxframesize\nSupported in h264qsv and hevcqsv. Change this value to reset qsv codec's MaxFrameSize\nconfiguration.\n\ngopsize\nChange this value to reset qsv codec's gop configuration.\n\nintreftype\nintrefcyclesize\nintrefqpdelta\nintrefcycledist\nSupported in h264qsv and hevcqsv. Change these value to reset qsv codec's Intra\nRefresh configuration.\n\nqmax\nqmin\nmaxqpi\nminqpi\nmaxqpp\nminqpp\nmaxqpb\nminqpb\nSupported in h264qsv. Change these value to reset qsv codec's max/min qp configuration.\n\nlowdelaybrc\nSupported in h264qsv, hevcqsv and av1qsv. Change this value to reset qsv codec's\nlowdelaybrc configuration.\n\nframerate\nChange this value to reset qsv codec's framerate configuration.\n\nbitrate\nrcbuffersize\nrcinitialbufferoccupancy\nrcmaxrate\nChange these value to reset qsv codec's bitrate control configuration.\n\npictimingsei\nSupported in h264qsv and hevcqsv. Change this value to reset qsv codec's\npictimingsei configuration.\n\nH264 options\n\nThese options are used by h264qsv\n\nextbrc\nExtended bitrate control.\n\nrecoverypointsei\nSet this flag to insert the recovery point SEI message at the beginning of every intra\nrefresh cycle.\n\nrdo Enable rate distortion optimization.\n\nmaxframesize\nMaximum encoded frame size in bytes.\n\nmaxframesizei\nMaximum encoded frame size for I frames in bytes. If this value is set as larger than\nzero, then for I frames the value set by maxframesize is ignored.\n\nmaxframesizep\nMaximum encoded frame size for P frames in bytes. If this value is set as larger than\nzero, then for P frames the value set by maxframesize is ignored.\n\nmaxslicesize\nMaximum encoded slice size in bytes.\n\nbitratelimit\nToggle bitrate limitations. Modifies bitrate to be in the range imposed by the QSV\nencoder. Setting this flag off may lead to violation of HRD conformance. Mind that\nspecifying bitrate below the QSV encoder range might significantly affect quality. If on\nthis option takes effect in non CQP modes: if bitrate is not in the range imposed by the\nQSV encoder, it will be changed to be in the range.\n\nmbbrc\nSetting this flag enables macroblock level bitrate control that generally improves\nsubjective visual quality. Enabling this flag may have negative impact on performance and\nobjective visual quality metric.\n\nlowdelaybrc\nSetting this flag turns on or off LowDelayBRC feautre in qsv plugin, which provides more\naccurate bitrate control to minimize the variance of bitstream size frame by frame.\nValue: -1-default 0-off 1-on\n\nadaptivei\nThis flag controls insertion of I frames by the QSV encoder. Turn ON this flag to allow\nchanging of frame type from P and B to I.\n\nadaptiveb\nThis flag controls changing of frame type from B to P.\n\npstrategy\nEnable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0).\n\nbstrategy\nThis option controls usage of B frames as reference.\n\ndblkidc\nThis option disable deblocking. It has value in range 0~2.\n\ncavlc\nIf set, CAVLC is used; if unset, CABAC is used for encoding.\n\nvcm Video conferencing mode, please see ratecontrol method.\n\nidrinterval\nDistance (in I-frames) between IDR frames.\n\npictimingsei\nInsert picture timing SEI with picstructsyntax element.\n\nsingleseinalunit\nPut all the SEI messages into one NALU.\n\nmaxdecframebuffering\nMaximum number of frames buffered in the DPB.\n\nlookahead\nUse VBR algorithm with look ahead.\n\nlookaheaddepth\nDepth of look ahead in number frames.\n\nlookaheaddownsampling\nDownscaling factor for the frames saved for the lookahead analysis.\n\nunknown\nauto\noff\n2x\n4x\nintreftype\nSpecifies intra refresh type. The major goal of intra refresh is improvement of error\nresilience without significant impact on encoded bitstream size caused by I frames. The\nSDK encoder achieves this by encoding part of each frame in refresh cycle using intra\nMBs. none means no refresh. vertical means vertical refresh, by column of MBs. horizontal\nmeans horizontal refresh, by rows of MBs. slice means horizontal refresh by slices\nwithout overlapping. In case of slice, inrefcyclesize is ignored. To enable intra\nrefresh, B frame should be set to 0.\n\nintrefcyclesize\nSpecifies number of pictures within refresh cycle starting from 2. 0 and 1 are invalid\nvalues.\n\nintrefqpdelta\nSpecifies QP difference for inserted intra MBs. This is signed value in [-51, 51] range\nif target encoding bit-depth for luma samples is 8 and this range is [-63, 63] for 10\nbit-depth or [-75, 75] for 12 bit-depth respectively.\n\nintrefcycledist\nDistance between the beginnings of the intra-refresh cycles in frames.\n\nprofile\nunknown\nbaseline\nmain\nhigh\na53cc\nUse A53 Closed Captions (if available).\n\naud Insert the Access Unit Delimiter NAL.\n\nmfmode\nMulti-Frame Mode.\n\noff\nauto\nrepeatpps\nRepeat pps for every frame.\n\nmaxqpi\nMaximum video quantizer scale for I frame.\n\nminqpi\nMinimum video quantizer scale for I frame.\n\nmaxqpp\nMaximum video quantizer scale for P frame.\n\nminqpp\nMinimum video quantizer scale for P frame.\n\nmaxqpb\nMaximum video quantizer scale for B frame.\n\nminqpb\nMinimum video quantizer scale for B frame.\n\nscenario\nProvides a hint to encoder about the scenario for the encoding session.\n\nunknown\ndisplayremoting\nvideoconference\narchive\nlivestreaming\ncameracapture\nvideosurveillance\ngamestreaming\nremotegaming\navbraccuracy\nAccuracy of the AVBR ratecontrol (unit of tenth of percent).\n\navbrconvergence\nConvergence of the AVBR ratecontrol (unit of 100 frames)\n\nThe parameters avbraccuracy and avbrconvergence are for the average variable bitrate\ncontrol (AVBR) algorithm. The algorithm focuses on overall encoding quality while\nmeeting the specified bitrate, targetbitrate, within the accuracy range avbraccuracy,\nafter a avbrConvergence period. This method does not follow HRD and the instant bitrate\nis not capped or padded.\n\nskipframe\nUse per-frame metadata \"qsvskipframe\" to skip frame when encoding. This option defines\nthe usage of this metadata.\n\nnoskip\nFrame skipping is disabled.\n\ninsertdummy\nEncoder inserts into bitstream frame where all macroblocks are encoded as skipped.\n\ninsertnothing\nSimilar to insertdummy, but encoder inserts nothing into bitstream. The skipped\nframes are still used in brc. For example, gop still include skipped frames, and the\nframes after skipped frames will be larger in size.\n\nbrconly\nskipframe metadata indicates the number of missed frames before the current frame.\n\nHEVC Options\n\nThese options are used by hevcqsv\n\nextbrc\nExtended bitrate control.\n\nrecoverypointsei\nSet this flag to insert the recovery point SEI message at the beginning of every intra\nrefresh cycle.\n\nrdo Enable rate distortion optimization.\n\nmaxframesize\nMaximum encoded frame size in bytes.\n\nmaxframesizei\nMaximum encoded frame size for I frames in bytes. If this value is set as larger than\nzero, then for I frames the value set by maxframesize is ignored.\n\nmaxframesizep\nMaximum encoded frame size for P frames in bytes. If this value is set as larger than\nzero, then for P frames the value set by maxframesize is ignored.\n\nmaxslicesize\nMaximum encoded slice size in bytes.\n\nmbbrc\nSetting this flag enables macroblock level bitrate control that generally improves\nsubjective visual quality. Enabling this flag may have negative impact on performance and\nobjective visual quality metric.\n\nlowdelaybrc\nSetting this flag turns on or off LowDelayBRC feautre in qsv plugin, which provides more\naccurate bitrate control to minimize the variance of bitstream size frame by frame.\nValue: -1-default 0-off 1-on\n\nadaptivei\nThis flag controls insertion of I frames by the QSV encoder. Turn ON this flag to allow\nchanging of frame type from P and B to I.\n\nadaptiveb\nThis flag controls changing of frame type from B to P.\n\npstrategy\nEnable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0).\n\nbstrategy\nThis option controls usage of B frames as reference.\n\ndblkidc\nThis option disable deblocking. It has value in range 0~2.\n\nidrinterval\nDistance (in I-frames) between IDR frames.\n\nbeginonly\nOutput an IDR-frame only at the beginning of the stream.\n\nloadplugin\nA user plugin to load in an internal session.\n\nnone\nhevcsw\nhevchw\nloadplugins\nA :-separate list of hexadecimal plugin UIDs to load in an internal session.\n\nlookaheaddepth\nDepth of look ahead in number frames, available when extbrc option is enabled.\n\nprofile\nSet the encoding profile (scc requires libmfx >= 1.32).\n\nunknown\nmain\nmain10\nmainsp\nrext\nscc\ntier\nSet the encoding tier (only level >= 4 can support high tier). This option only takes\neffect when the level option is specified.\n\nmain\nhigh\ngpb 1: GPB (generalized P/B frame)\n\n0: regular P frame.\n\ntilecols\nNumber of columns for tiled encoding.\n\ntilerows\nNumber of rows for tiled encoding.\n\naud Insert the Access Unit Delimiter NAL.\n\npictimingsei\nInsert picture timing SEI with picstructsyntax element.\n\ntransformskip\nTurn this option ON to enable transformskip. It is supported on platform equal or newer\nthan ICL.\n\nintreftype\nSpecifies intra refresh type. The major goal of intra refresh is improvement of error\nresilience without significant impact on encoded bitstream size caused by I frames. The\nSDK encoder achieves this by encoding part of each frame in refresh cycle using intra\nMBs. none means no refresh. vertical means vertical refresh, by column of MBs. horizontal\nmeans horizontal refresh, by rows of MBs. slice means horizontal refresh by slices\nwithout overlapping. In case of slice, inrefcyclesize is ignored. To enable intra\nrefresh, B frame should be set to 0.\n\nintrefcyclesize\nSpecifies number of pictures within refresh cycle starting from 2. 0 and 1 are invalid\nvalues.\n\nintrefqpdelta\nSpecifies QP difference for inserted intra MBs. This is signed value in [-51, 51] range\nif target encoding bit-depth for luma samples is 8 and this range is [-63, 63] for 10\nbit-depth or [-75, 75] for 12 bit-depth respectively.\n\nintrefcycledist\nDistance between the beginnings of the intra-refresh cycles in frames.\n\nmaxqpi\nMaximum video quantizer scale for I frame.\n\nminqpi\nMinimum video quantizer scale for I frame.\n\nmaxqpp\nMaximum video quantizer scale for P frame.\n\nminqpp\nMinimum video quantizer scale for P frame.\n\nmaxqpb\nMaximum video quantizer scale for B frame.\n\nminqpb\nMinimum video quantizer scale for B frame.\n\nscenario\nProvides a hint to encoder about the scenario for the encoding session.\n\nunknown\ndisplayremoting\nvideoconference\narchive\nlivestreaming\ncameracapture\nvideosurveillance\ngamestreaming\nremotegaming\navbraccuracy\nAccuracy of the AVBR ratecontrol (unit of tenth of percent).\n\navbrconvergence\nConvergence of the AVBR ratecontrol (unit of 100 frames)\n\nThe parameters avbraccuracy and avbrconvergence are for the average variable bitrate\ncontrol (AVBR) algorithm. The algorithm focuses on overall encoding quality while\nmeeting the specified bitrate, targetbitrate, within the accuracy range avbraccuracy,\nafter a avbrConvergence period. This method does not follow HRD and the instant bitrate\nis not capped or padded.\n\nskipframe\nUse per-frame metadata \"qsvskipframe\" to skip frame when encoding. This option defines\nthe usage of this metadata.\n\nnoskip\nFrame skipping is disabled.\n\ninsertdummy\nEncoder inserts into bitstream frame where all macroblocks are encoded as skipped.\n\ninsertnothing\nSimilar to insertdummy, but encoder inserts nothing into bitstream. The skipped\nframes are still used in brc. For example, gop still include skipped frames, and the\nframes after skipped frames will be larger in size.\n\nbrconly\nskipframe metadata indicates the number of missed frames before the current frame.\n\nMPEG2 Options\n\nThese options are used by mpeg2qsv\n\nprofile\nunknown\nsimple\nmain\nhigh\n\nVP9 Options\n\nThese options are used by vp9qsv\n\nprofile\nunknown\nprofile0\nprofile1\nprofile2\nprofile3\ntilecols\nNumber of columns for tiled encoding (requires libmfx >= 1.29).\n\ntilerows\nNumber of rows for tiled encoding (requires libmfx >= 1.29).\n\nAV1 Options\n\nThese options are used by av1qsv (requires libvpl).\n\nprofile\nunknown\nmain\ntilecols\nNumber of columns for tiled encoding.\n\ntilerows\nNumber of rows for tiled encoding.\n\nadaptivei\nThis flag controls insertion of I frames by the QSV encoder. Turn ON this flag to allow\nchanging of frame type from P and B to I.\n\nadaptiveb\nThis flag controls changing of frame type from B to P.\n\nbstrategy\nThis option controls usage of B frames as reference.\n\nextbrc\nExtended bitrate control.\n\nlookaheaddepth\nDepth of look ahead in number frames, available when extbrc option is enabled.\n\nlowdelaybrc\nSetting this flag turns on or off LowDelayBRC feautre in qsv plugin, which provides more\naccurate bitrate control to minimize the variance of bitstream size frame by frame.\nValue: -1-default 0-off 1-on\n" }, { "name": "max_frame_size", "content": "Set the allowed max size in bytes for each frame. If the frame size exceeds the\nlimitation, encoder will adjust the QP value to control the frame size. Invalid in CQP\nrate control mode.\n" }, { "name": "snow", "content": "Options\n" }, { "name": "iterative_dia_size", "content": "dia size for the iterative motion estimation\n" }, { "name": "VAAPI encoders", "content": "Wrappers for hardware encoders accessible via VAAPI.\n\nThese encoders only accept input in VAAPI hardware surfaces. If you have input in software\nframes, use the hwupload filter to upload them to the GPU.\n\nThe following standard libavcodec options are used:\n\n• g / gopsize\n\n• bf / maxbframes\n\n• profile\n\nIf not set, this will be determined automatically from the format of the input frames and\nthe profiles supported by the driver.\n\n• level\n\n• b / bitrate\n\n• maxrate / rcmaxrate\n\n• bufsize / rcbuffersize\n\n• rcinitoccupancy / rcinitialbufferoccupancy\n\n• compressionlevel\n\nSpeed / quality tradeoff: higher values are faster / worse quality.\n\n• q / globalquality\n\nSize / quality tradeoff: higher values are smaller / worse quality.\n\n• qmin\n\n• qmax\n\n• iqfactor / iquantfactor\n\n• iqoffset / iquantoffset\n\n• bqfactor / bquantfactor\n\n• bqoffset / bquantoffset\n\n• slices\n\nAll encoders support the following options:\n" }, { "name": "low_power", "content": "Some drivers/platforms offer a second encoder for some codecs intended to use less power\nthan the default encoder; setting this option will attempt to use that encoder. Note\nthat it may support a reduced feature set, so some other options may not be available in\nthis mode.\n" }, { "name": "idr_interval", "content": "Set the number of normal intra frames between full-refresh (IDR) frames in open-GOP mode.\nThe intra frames are still IRAPs, but will not include global headers and may have non-\ndecodable leading pictures.\n" }, { "name": "b_depth", "content": "Set the B-frame reference depth. When set to one (the default), all B-frames will refer\nonly to P- or I-frames. When set to greater values multiple layers of B-frames will be\npresent, frames in each layer only referring to frames in higher layers.\n" }, { "name": "async_depth", "content": "Maximum processing parallelism. Increase this to improve single channel performance. This\noption doesn't work if driver doesn't implement vaSyncBuffer function. Please make sure\nthere are enough hwframes allocated if a large number of asyncdepth is used.\n" }, { "name": "max_frame_size", "content": "Set the allowed max size in bytes for each frame. If the frame size exceeds the\nlimitation, encoder will adjust the QP value to control the frame size. Invalid in CQP\nrate control mode.\n" }, { "name": "rc_mode", "content": "Set the rate control mode to use. A given driver may only support a subset of modes.\n\nPossible modes:\n\nauto\nChoose the mode automatically based on driver support and the other options. This is\nthe default.\n\nCQP Constant-quality.\n\nCBR Constant-bitrate.\n\nVBR Variable-bitrate.\n\nICQ Intelligent constant-quality.\n\nQVBR\nQuality-defined variable-bitrate.\n\nAVBR\nAverage variable bitrate.\n\nEach encoder also has its own specific options:\n" }, { "name": "av1_vaapi", "content": "profile sets the value of seqprofile. tier sets the value of seqtier. level sets the\nvalue of seqlevelidx.\n\ntiles\nSet the number of tiles to encode the input video with, as columns x rows. (default\nis auto, which means use minimal tile column/row number).\n\ntilegroups\nSet tile groups number. All the tiles will be distributed as evenly as possible to\neach tile group. (default is 1).\n" }, { "name": "h264_vaapi", "content": "profile sets the value of profileidc and the constraintset*flags. level sets the\nvalue of levelidc.\n\ncoder\nSet entropy encoder (default is cabac). Possible values:\n\nac\ncabac\nUse CABAC.\n\nvlc\ncavlc\nUse CAVLC.\n\naud Include access unit delimiters in the stream (not included by default).\n\nsei Set SEI message types to include. Some combination of the following values:\n\nidentifier\nInclude a userdataunregistered message containing information about the\nencoder.\n\ntiming\nInclude picture timing parameters (bufferingperiod and pictiming messages).\n\nrecoverypoint\nInclude recovery points where appropriate (recoverypoint messages).\n" }, { "name": "hevc_vaapi", "content": "profile and level set the values of generalprofileidc and generallevelidc\nrespectively.\n\naud Include access unit delimiters in the stream (not included by default).\n\ntier\nSet generaltierflag. This may affect the level chosen for the stream if it is not\nexplicitly specified.\n\nsei Set SEI message types to include. Some combination of the following values:\n\nhdr Include HDR metadata if the input frames have it (masteringdisplaycolourvolume\nand contentlightlevel messages).\n\ntiles\nSet the number of tiles to encode the input video with, as columns x rows. Larger\nnumbers allow greater parallelism in both encoding and decoding, but may decrease\ncoding efficiency.\n" }, { "name": "mjpeg_vaapi", "content": "Only baseline DCT encoding is supported. The encoder always uses the standard\nquantisation and huffman tables - globalquality scales the standard quantisation table\n(range 1-100).\n\nFor YUV, 4:2:0, 4:2:2 and 4:4:4 subsampling modes are supported. RGB is also supported,\nand will create an RGB JPEG.\n\njfif\nInclude JFIF header in each frame (not included by default).\n\nhuffman\nInclude standard huffman tables (on by default). Turning this off will save a few\nhundred bytes in each output frame, but may lose compatibility with some JPEG\ndecoders which don't fully handle MJPEG.\n" }, { "name": "mpeg2_vaapi", "content": "profile and level set the value of profileandlevelindication.\n" }, { "name": "vp8_vaapi", "content": "B-frames are not supported.\n\nglobalquality sets the qidx used for non-key frames (range 0-127).\n\nloopfilterlevel\nloopfiltersharpness\nManually set the loop filter parameters.\n" }, { "name": "vp9_vaapi", "content": "globalquality sets the qidx used for P-frames (range 0-255).\n\nloopfilterlevel\nloopfiltersharpness\nManually set the loop filter parameters.\n\nB-frames are supported, but the output stream is always in encode order rather than\ndisplay order. If B-frames are enabled, it may be necessary to use the vp9rawreorder\nbitstream filter to modify the output stream to display frames in the correct order.\n\nOnly normal frames are produced - the vp9superframe bitstream filter may be required to\nproduce a stream usable with all decoders.\n" }, { "name": "vbn", "content": "Vizrt Binary Image encoder.\n\nThis format is used by the broadcast vendor Vizrt for quick texture streaming. Advanced\nfeatures of the format such as LZW compression of texture data or generation of mipmaps are\nnot supported.\n\nOptions\n\nformat string\nSets the texture compression used by the VBN file. Can be dxt1, dxt5 or raw. Default is\ndxt5.\n" }, { "name": "vc2", "content": "SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed at professional\nbroadcasting but since it supports yuv420, yuv422 and yuv444 at 8 (limited range or full\nrange), 10 or 12 bits, this makes it suitable for other tasks which require low overhead and\nlow compression (like screen recording).\n\nOptions\n\nb Sets target video bitrate. Usually that's around 1:6 of the uncompressed video bitrate\n(e.g. for 1920x1080 50fps yuv422p10 that's around 400Mbps). Higher values (close to the\nuncompressed bitrate) turn on lossless compression mode.\n" }, { "name": "field_order", "content": "Enables field coding when set (e.g. to tt - top field first) for interlaced inputs.\nShould increase compression with interlaced content as it splits the fields and encodes\neach separately.\n" }, { "name": "wavelet_depth", "content": "Sets the total amount of wavelet transforms to apply, between 1 and 5 (default). Lower\nvalues reduce compression and quality. Less capable decoders may not be able to handle\nvalues of waveletdepth over 3.\n" }, { "name": "wavelet_type", "content": "Sets the transform type. Currently only 53 (LeGall) and 97 (Deslauriers-Dubuc) are\nimplemented, with 97 being the one with better compression and thus is the default.\n" }, { "name": "slice_width", "content": "" }, { "name": "slice_height", "content": "Sets the slice size for each slice. Larger values result in better compression. For\ncompatibility with other more limited decoders use slicewidth of 32 and sliceheight of\n8.\n" }, { "name": "tolerance", "content": "Sets the undershoot tolerance of the rate control system in percent. This is to prevent\nan expensive search from being run.\n\nqm Sets the quantization matrix preset to use by default or when waveletdepth is set to 5\n\n- default Uses the default quantization matrix from the specifications, extended with\nvalues for the fifth level. This provides a good balance between keeping detail and\nomitting artifacts.\n\n- flat Use a completely zeroed out quantization matrix. This increases PSNR but might\nreduce perception. Use in bogus benchmarks.\n\n- color Reduces detail but attempts to preserve color at extremely low bitrates.\n" } ] }, "SUBTITLES ENCODERS": { "content": "", "subsections": [ { "name": "dvdsub", "content": "This codec encodes the bitmap subtitle format that is used in DVDs. Typically they are\nstored in VOBSUB file pairs (*.idx + *.sub), and they can also be used in Matroska files.\n\nOptions\n" }, { "name": "palette", "content": "Specify the global palette used by the bitmaps.\n\nThe format for this option is a string containing 16 24-bits hexadecimal numbers (without\n0x prefix) separated by commas, for example \"0d00ee, ee450d, 101010, eaeaea, 0ce60b,\nec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b\".\n" }, { "name": "even_rows_fix", "content": "When set to 1, enable a work-around that makes the number of pixel rows even in all\nsubtitles. This fixes a problem with some players that cut off the bottom row if the\nnumber is odd. The work-around just adds a fully transparent row if needed. The\noverhead is low, typically one byte per subtitle on average.\n\nBy default, this work-around is disabled.\n" } ] }, "BITSTREAM FILTERS": { "content": "When you configure your FFmpeg build, all the supported bitstream filters are enabled by\ndefault. You can list all available ones using the configure option \"--list-bsfs\".\n\nYou can disable all the bitstream filters using the configure option \"--disable-bsfs\", and\nselectively enable any bitstream filter using the option \"--enable-bsf=BSF\", or you can\ndisable a particular bitstream filter using the option \"--disable-bsf=BSF\".\n\nThe option \"-bsfs\" of the ff* tools will display the list of all the supported bitstream\nfilters included in your build.\n\nThe ff* tools have a -bsf option applied per stream, taking a comma-separated list of\nfilters, whose parameters follow the filter name after a '='.\n\nffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT\n\nBelow is a description of the currently available bitstream filters, with their parameters,\nif any.\n", "subsections": [ { "name": "aac_adtstoasc", "content": "Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration bitstream.\n\nThis filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS header and removes\nthe ADTS header.\n\nThis filter is required for example when copying an AAC stream from a raw ADTS AAC or an\nMPEG-TS container to MP4A-LATM, to an FLV file, or to MOV/MP4 files and related formats such\nas 3GP or M4A. Please note that it is auto-inserted for MP4A-LATM and MOV/MP4 and related\nformats.\n" }, { "name": "av1_metadata", "content": "Modify metadata embedded in an AV1 stream.\n\ntd Insert or remove temporal delimiter OBUs in all temporal units of the stream.\n\ninsert\nInsert a TD at the beginning of every TU which does not already have one.\n\nremove\nRemove the TD from the beginning of every TU which has one.\n" }, { "name": "color_primaries", "content": "" }, { "name": "transfer_characteristics", "content": "" }, { "name": "matrix_coefficients", "content": "Set the color description fields in the stream (see AV1 section 6.4.2).\n" }, { "name": "color_range", "content": "Set the color range in the stream (see AV1 section 6.4.2; note that this cannot be set\nfor streams using BT.709 primaries, sRGB transfer characteristic and identity (RGB)\nmatrix coefficients).\n\ntv Limited range.\n\npc Full range.\n" }, { "name": "chroma_sample_position", "content": "Set the chroma sample location in the stream (see AV1 section 6.4.2). This can only be\nset for 4:2:0 streams.\n\nvertical\nLeft position (matching the default in MPEG-2 and H.264).\n\ncolocated\nTop-left position.\n" }, { "name": "tick_rate", "content": "Set the tick rate (timescale / numunitsindisplaytick) in the timing info in the\nsequence header.\n" }, { "name": "num_ticks_per_picture", "content": "Set the number of ticks in each picture, to indicate that the stream has a fixed\nframerate. Ignored if tickrate is not also set.\n" }, { "name": "delete_padding", "content": "Deletes Padding OBUs.\n" }, { "name": "chomp", "content": "Remove zero padding at the end of a packet.\n" }, { "name": "dca_core", "content": "Extract the core from a DCA/DTS stream, dropping extensions such as DTS-HD.\n" }, { "name": "dump_extra", "content": "Add extradata to the beginning of the filtered packets except when said packets already\nexactly begin with the extradata that is intended to be added.\n" }, { "name": "freq", "content": "The additional argument specifies which packets should be filtered. It accepts the\nvalues:\n\nk\nkeyframe\nadd extradata to all key packets\n\ne\nall add extradata to all packets\n\nIf not specified it is assumed k.\n\nFor example the following ffmpeg command forces a global header (thus disabling individual\npacket headers) in the H.264 packets generated by the \"libx264\" encoder, but corrects them by\nadding the header stored in extradata to the key packets:\n\nffmpeg -i INPUT -map 0 -flags:v +globalheader -c:v libx264 -bsf:v dumpextra out.ts\n" }, { "name": "dv_error_marker", "content": "Blocks in DV which are marked as damaged are replaced by blocks of the specified color.\n" }, { "name": "color", "content": "The color to replace damaged blocks by\n\nsta A 16 bit mask which specifies which of the 16 possible error status values are to be\nreplaced by colored blocks. 0xFFFE is the default which replaces all non 0 error status\nvalues.\n\nok No error, no concealment\n\nerr Error, No concealment\n\nres Reserved\n\nnotok\nError or concealment\n\nnotres\nNot reserved\n\nAa, Ba, Ca, Ab, Bb, Cb, A, B, C, a, b, erri, erru\nThe specific error status code\n\nsee page 44-46 or section 5.5 of\n\n" }, { "name": "eac3_core", "content": "Extract the core from a E-AC-3 stream, dropping extra channels.\n" }, { "name": "extract_extradata", "content": "Extract the in-band extradata.\n\nCertain codecs allow the long-term headers (e.g. MPEG-2 sequence headers, or H.264/HEVC\n(VPS/)SPS/PPS) to be transmitted either \"in-band\" (i.e. as a part of the bitstream containing\nthe coded frames) or \"out of band\" (e.g. on the container level). This latter form is called\n\"extradata\" in FFmpeg terminology.\n\nThis bitstream filter detects the in-band headers and makes them available as extradata.\n" }, { "name": "remove", "content": "When this option is enabled, the long-term headers are removed from the bitstream after\nextraction.\n" }, { "name": "filter_units", "content": "Remove units with types in or not in a given set from the stream.\n" }, { "name": "pass_types", "content": "List of unit types or ranges of unit types to pass through while removing all others.\nThis is specified as a '|'-separated list of unit type values or ranges of values with\n'-'.\n" }, { "name": "remove_types", "content": "Identical to passtypes, except the units in the given set removed and all others passed\nthrough.\n\nExtradata is unchanged by this transformation, but note that if the stream contains inline\nparameter sets then the output may be unusable if they are removed.\n\nFor example, to remove all non-VCL NAL units from an H.264 stream:\n\nffmpeg -i INPUT -c:v copy -bsf:v 'filterunits=passtypes=1-5' OUTPUT\n\nTo remove all AUDs, SEI and filler from an H.265 stream:\n\nffmpeg -i INPUT -c:v copy -bsf:v 'filterunits=removetypes=35|38-40' OUTPUT\n" }, { "name": "hapqa_extract", "content": "Extract Rgb or Alpha part of an HAPQA file, without recompression, in order to create an HAPQ\nor an HAPAlphaOnly file.\n" }, { "name": "texture", "content": "Specifies the texture to keep.\n\ncolor\nalpha\n\nConvert HAPQA to HAPQ\n\nffmpeg -i hapqainputfile.mov -c copy -bsf:v hapqaextract=texture=color -tag:v HapY -metadata:s:v:0 encoder=\"HAPQ\" hapqfile.mov\n\nConvert HAPQA to HAPAlphaOnly\n\nffmpeg -i hapqainputfile.mov -c copy -bsf:v hapqaextract=texture=alpha -tag:v HapA -metadata:s:v:0 encoder=\"HAPAlpha Only\" hapalphaonlyfile.mov\n" }, { "name": "h264_metadata", "content": "Modify metadata embedded in an H.264 stream.\n\naud Insert or remove AUD NAL units in all access units of the stream.\n\npass\ninsert\nremove\n\nDefault is pass.\n" }, { "name": "sample_aspect_ratio", "content": "Set the sample aspect ratio of the stream in the VUI parameters. See H.264 table E-1.\n" }, { "name": "overscan_appropriate_flag", "content": "Set whether the stream is suitable for display using overscan or not (see H.264 section\nE.2.1).\n" }, { "name": "video_format", "content": "" }, { "name": "video_full_range_flag", "content": "Set the video format in the stream (see H.264 section E.2.1 and table E-2).\n" }, { "name": "colour_primaries", "content": "" }, { "name": "transfer_characteristics", "content": "" }, { "name": "matrix_coefficients", "content": "Set the colour description in the stream (see H.264 section E.2.1 and tables E-3, E-4 and\nE-5).\n" }, { "name": "chroma_sample_loc_type", "content": "Set the chroma sample location in the stream (see H.264 section E.2.1 and figure E-1).\n" }, { "name": "tick_rate", "content": "Set the tick rate (timescale / numunitsintick) in the VUI parameters. This is the\nsmallest time unit representable in the stream, and in many cases represents the field\nrate of the stream (double the frame rate).\n" }, { "name": "fixed_frame_rate_flag", "content": "Set whether the stream has fixed framerate - typically this indicates that the framerate\nis exactly half the tick rate, but the exact meaning is dependent on interlacing and the\npicture structure (see H.264 section E.2.1 and table E-6).\n" }, { "name": "zero_new_constraint_set_flags", "content": "Zero constraintset4flag and constraintset5flag in the SPS. These bits were reserved\nin a previous version of the H.264 spec, and thus some hardware decoders require these to\nbe zero. The result of zeroing this is still a valid bitstream.\n" }, { "name": "crop_left", "content": "" }, { "name": "crop_right", "content": "" }, { "name": "crop_top", "content": "" }, { "name": "crop_bottom", "content": "Set the frame cropping offsets in the SPS. These values will replace the current ones if\nthe stream is already cropped.\n\nThese fields are set in pixels. Note that some sizes may not be representable if the\nchroma is subsampled or the stream is interlaced (see H.264 section 7.4.2.1.1).\n" }, { "name": "sei_user_data", "content": "Insert a string as SEI unregistered user data. The argument must be of the form\nUUID+string, where the UUID is as hex digits possibly separated by hyphens, and the\nstring can be anything.\n\nFor example, 086f3693-b7b3-4f2c-9653-21492feee5b8+hello will insert the string ``hello''\nassociated with the given UUID.\n" }, { "name": "delete_filler", "content": "Deletes both filler NAL units and filler SEI messages.\n" }, { "name": "display_orientation", "content": "Insert, extract or remove Display orientation SEI messages. See H.264 section D.1.27 and\nD.2.27 for syntax and semantics.\n\npass\ninsert\nremove\nextract\n\nDefault is pass.\n\nInsert mode works in conjunction with \"rotate\" and \"flip\" options. Any pre-existing\nDisplay orientation messages will be removed in insert or remove mode. Extract mode\nattaches the display matrix to the packet as side data.\n" }, { "name": "rotate", "content": "Set rotation in display orientation SEI (anticlockwise angle in degrees). Range is -360\nto +360. Default is NaN.\n" }, { "name": "flip", "content": "Set flip in display orientation SEI.\n\nhorizontal\nvertical\n\nDefault is unset.\n" }, { "name": "level", "content": "Set the level in the SPS. Refer to H.264 section A.3 and tables A-1 to A-5.\n\nThe argument must be the name of a level (for example, 4.2), a levelidc value (for\nexample, 42), or the special name auto indicating that the filter should attempt to guess\nthe level from the input stream properties.\n" }, { "name": "h264_mp4toannexb", "content": "Convert an H.264 bitstream from length prefixed mode to start code prefixed mode (as defined\nin the Annex B of the ITU-T H.264 specification).\n\nThis is required by some streaming formats, typically the MPEG-2 transport stream format\n(muxer \"mpegts\").\n\nFor example to remux an MP4 file containing an H.264 stream to mpegts format with ffmpeg, you\ncan use the command:\n\nffmpeg -i INPUT.mp4 -codec copy -bsf:v h264mp4toannexb OUTPUT.ts\n\nPlease note that this filter is auto-inserted for MPEG-TS (muxer \"mpegts\") and raw H.264\n(muxer \"h264\") output formats.\n" }, { "name": "h264_redundant_pps", "content": "This applies a specific fixup to some Blu-ray streams which contain redundant PPSs modifying\nirrelevant parameters of the stream which confuse other transformations which require correct\nextradata.\n" }, { "name": "hevc_metadata", "content": "Modify metadata embedded in an HEVC stream.\n\naud Insert or remove AUD NAL units in all access units of the stream.\n\ninsert\nremove" }, { "name": "sample_aspect_ratio", "content": "Set the sample aspect ratio in the stream in the VUI parameters.\n" }, { "name": "video_format", "content": "" }, { "name": "video_full_range_flag", "content": "Set the video format in the stream (see H.265 section E.3.1 and table E.2).\n" }, { "name": "colour_primaries", "content": "" }, { "name": "transfer_characteristics", "content": "" }, { "name": "matrix_coefficients", "content": "Set the colour description in the stream (see H.265 section E.3.1 and tables E.3, E.4 and\nE.5).\n" }, { "name": "chroma_sample_loc_type", "content": "Set the chroma sample location in the stream (see H.265 section E.3.1 and figure E.1).\n" }, { "name": "tick_rate", "content": "Set the tick rate in the VPS and VUI parameters (timescale / numunitsintick).\nCombined with numtickspocdiffone, this can set a constant framerate in the stream.\nNote that it is likely to be overridden by container parameters when the stream is in a\ncontainer.\n" }, { "name": "num_ticks_poc_diff_one", "content": "Set pocproportionaltotimingflag in VPS and VUI and use this value to set\nnumtickspocdiffoneminus1 (see H.265 sections 7.4.3.1 and E.3.1). Ignored if\ntickrate is not also set.\n" }, { "name": "crop_left", "content": "" }, { "name": "crop_right", "content": "" }, { "name": "crop_top", "content": "" }, { "name": "crop_bottom", "content": "Set the conformance window cropping offsets in the SPS. These values will replace the\ncurrent ones if the stream is already cropped.\n\nThese fields are set in pixels. Note that some sizes may not be representable if the\nchroma is subsampled (H.265 section 7.4.3.2.1).\n" }, { "name": "level", "content": "Set the level in the VPS and SPS. See H.265 section A.4 and tables A.6 and A.7.\n\nThe argument must be the name of a level (for example, 5.1), a generallevelidc value\n(for example, 153 for level 5.1), or the special name auto indicating that the filter\nshould attempt to guess the level from the input stream properties.\n" }, { "name": "hevc_mp4toannexb", "content": "Convert an HEVC/H.265 bitstream from length prefixed mode to start code prefixed mode (as\ndefined in the Annex B of the ITU-T H.265 specification).\n\nThis is required by some streaming formats, typically the MPEG-2 transport stream format\n(muxer \"mpegts\").\n\nFor example to remux an MP4 file containing an HEVC stream to mpegts format with ffmpeg, you\ncan use the command:\n\nffmpeg -i INPUT.mp4 -codec copy -bsf:v hevcmp4toannexb OUTPUT.ts\n\nPlease note that this filter is auto-inserted for MPEG-TS (muxer \"mpegts\") and raw HEVC/H.265\n(muxer \"h265\" or \"hevc\") output formats.\n" }, { "name": "imxdump", "content": "Modifies the bitstream to fit in MOV and to be usable by the Final Cut Pro decoder. This\nfilter only applies to the mpeg2video codec, and is likely not needed for Final Cut Pro 7 and\nnewer with the appropriate -tag:v.\n\nFor example, to remux 30 MB/sec NTSC IMX to MOV:\n\nffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov\n" }, { "name": "mjpeg2jpeg", "content": "Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.\n\nMJPEG is a video codec wherein each video frame is essentially a JPEG image. The individual\nframes can be extracted without loss, e.g. by\n\nffmpeg -i ../somemjpeg.avi -c:v copy frames%d.jpg\n\nUnfortunately, these chunks are incomplete JPEG images, because they lack the DHT segment\nrequired for decoding. Quoting from\n:\n\nAvery Lee, writing in the rec.video.desktop newsgroup in 2001, commented that \"MJPEG, or at\nleast the MJPEG in AVIs having the MJPG fourcc, is restricted JPEG with a fixed -- and\n*omitted* -- Huffman table. The JPEG must be YCbCr colorspace, it must be 4:2:2, and it must\nuse basic Huffman encoding, not arithmetic or progressive. . . . You can indeed extract the\nMJPEG frames and decode them with a regular JPEG decoder, but you have to prepend the DHT\nsegment to them, or else the decoder won't have any idea how to decompress the data. The\nexact table necessary is given in the OpenDML spec.\"\n\nThis bitstream filter patches the header of frames extracted from an MJPEG stream (carrying\nthe AVI1 header ID and lacking a DHT segment) to produce fully qualified JPEG images.\n\nffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame%d.jpg\nexiftran -i -9 frame*.jpg\nffmpeg -i frame%d.jpg -c:v copy rotated.avi\n" }, { "name": "mjpegadump", "content": "Add an MJPEG A header to the bitstream, to enable decoding by Quicktime.\n" }, { "name": "mov2textsub", "content": "Extract a representable text file from MOV subtitles, stripping the metadata header from each\nsubtitle packet.\n\nSee also the text2movsub filter.\n" }, { "name": "mp3decomp", "content": "Decompress non-standard compressed MP3 audio headers.\n" }, { "name": "mpeg2_metadata", "content": "Modify metadata embedded in an MPEG-2 stream.\n" }, { "name": "display_aspect_ratio", "content": "Set the display aspect ratio in the stream.\n\nThe following fixed values are supported:\n\n4/3\n16/9\n221/100\n\nAny other value will result in square pixels being signalled instead (see H.262 section\n6.3.3 and table 6-3).\n" }, { "name": "frame_rate", "content": "Set the frame rate in the stream. This is constructed from a table of known values\ncombined with a small multiplier and divisor - if the supplied value is not exactly\nrepresentable, the nearest representable value will be used instead (see H.262 section\n6.3.3 and table 6-4).\n" }, { "name": "video_format", "content": "Set the video format in the stream (see H.262 section 6.3.6 and table 6-6).\n" }, { "name": "colour_primaries", "content": "" }, { "name": "transfer_characteristics", "content": "" }, { "name": "matrix_coefficients", "content": "Set the colour description in the stream (see H.262 section 6.3.6 and tables 6-7, 6-8 and\n6-9).\n" }, { "name": "mpeg4_unpack_bframes", "content": "Unpack DivX-style packed B-frames.\n\nDivX-style packed B-frames are not valid MPEG-4 and were only a workaround for the broken\nVideo for Windows subsystem. They use more space, can cause minor AV sync issues, require\nmore CPU power to decode (unless the player has some decoded picture queue to compensate the\n2,0,2,0 frame per packet style) and cause trouble if copied into a standard container like\nmp4 or mpeg-ps/ts, because MPEG-4 decoders may not be able to decode them, since they are not\nvalid MPEG-4.\n\nFor example to fix an AVI file containing an MPEG-4 stream with DivX-style packed B-frames\nusing ffmpeg, you can use the command:\n\nffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4unpackbframes OUTPUT.avi\n" }, { "name": "noise", "content": "Damages the contents of packets or simply drops them without damaging the container. Can be\nused for fuzzing or testing error resilience/concealment.\n\nParameters:\n" }, { "name": "amount", "content": "Accepts an expression whose evaluation per-packet determines how often bytes in that\npacket will be modified. A value below 0 will result in a variable frequency. Default is\n0 which results in no modification. However, if neither amount nor drop is specified,\namount will be set to -1. See below for accepted variables.\n" }, { "name": "drop", "content": "Accepts an expression evaluated per-packet whose value determines whether that packet is\ndropped. Evaluation to a positive value results in the packet being dropped. Evaluation\nto a negative value results in a variable chance of it being dropped, roughly inverse in\nproportion to the magnitude of the value. Default is 0 which results in no drops. See\nbelow for accepted variables.\n" }, { "name": "dropamount", "content": "Accepts a non-negative integer, which assigns a variable chance of it being dropped,\nroughly inverse in proportion to the value. Default is 0 which results in no drops. This\noption is kept for backwards compatibility and is equivalent to setting drop to a\nnegative value with the same magnitude i.e. \"dropamount=4\" is the same as \"drop=-4\".\nIgnored if drop is also specified.\n\nBoth \"amount\" and \"drop\" accept expressions containing the following variables:\n\nn The index of the packet, starting from zero.\n\ntb The timebase for packet timestamps.\n\npts Packet presentation timestamp.\n\ndts Packet decoding timestamp.\n" }, { "name": "nopts", "content": "Constant representing AVNOPTSVALUE.\n" }, { "name": "startpts", "content": "First non-AVNOPTSVALUE PTS seen in the stream.\n" }, { "name": "startdts", "content": "First non-AVNOPTSVALUE DTS seen in the stream.\n" }, { "name": "duration", "content": "d Packet duration, in timebase units.\n\npos Packet position in input; may be -1 when unknown or not set.\n" }, { "name": "size", "content": "Packet size, in bytes.\n\nkey Whether packet is marked as a keyframe.\n" }, { "name": "state", "content": "A pseudo random integer, primarily derived from the content of packet payload.\n\nExamples\n\nApply modification to every byte but don't drop any packets.\n\nffmpeg -i INPUT -c copy -bsf noise=1 output.mkv\n\nDrop every video packet not marked as a keyframe after timestamp 30s but do not modify any of\nthe remaining packets.\n\nffmpeg -i INPUT -c copy -bsf:v noise=drop='gt(t\\,30)*not(key)' output.mkv\n\nDrop one second of audio every 10 seconds and add some random noise to the rest.\n\nffmpeg -i INPUT -c copy -bsf:a noise=amount=-1:drop='between(mod(t\\,10)\\,9\\,10)' output.mkv\n" }, { "name": "null", "content": "This bitstream filter passes the packets through unchanged.\n" }, { "name": "pcm_rechunk", "content": "Repacketize PCM audio to a fixed number of samples per packet or a fixed packet rate per\nsecond. This is similar to the asetnsamples audio filter but works on audio packets instead\nof audio frames.\n" }, { "name": "nb_out_samples, n", "content": "Set the number of samples per each output audio packet. The number is intended as the\nnumber of samples per each channel. Default value is 1024.\n" }, { "name": "pad, p", "content": "If set to 1, the filter will pad the last audio packet with silence, so that it will\ncontain the same number of samples (or roughly the same number of samples, see\nframerate) as the previous ones. Default value is 1.\n" }, { "name": "frame_rate, r", "content": "This option makes the filter output a fixed number of packets per second instead of a\nfixed number of samples per packet. If the audio sample rate is not divisible by the\nframe rate then the number of samples will not be constant but will vary slightly so that\neach packet will start as close to the frame boundary as possible. Using this option has\nprecedence over nboutsamples.\n\nYou can generate the well known 1602-1601-1602-1601-1602 pattern of 48kHz audio for NTSC\nframe rate using the framerate option.\n\nffmpeg -f lavfi -i sine=r=48000:d=1 -c pcms16le -bsf pcmrechunk=r=30000/1001 -f framecrc -\n" }, { "name": "pgs_frame_merge", "content": "Merge a sequence of PGS Subtitle segments ending with an \"end of display set\" segment into a\nsingle packet.\n\nThis is required by some containers that support PGS subtitles (muxer \"matroska\").\n" }, { "name": "prores_metadata", "content": "Modify color property metadata embedded in prores stream.\n" }, { "name": "color_primaries", "content": "Set the color primaries. Available values are:\n\nauto\nKeep the same color primaries property (default).\n\nunknown\nbt709\nbt470bg\nBT601 625\n\nsmpte170m\nBT601 525\n\nbt2020\nsmpte431\nDCI P3\n\nsmpte432\nP3 D65\n" }, { "name": "transfer_characteristics", "content": "Set the color transfer. Available values are:\n\nauto\nKeep the same transfer characteristics property (default).\n\nunknown\nbt709\nBT 601, BT 709, BT 2020\n\nsmpte2084\nSMPTE ST 2084\n\narib-std-b67\nARIB STD-B67\n" }, { "name": "matrix_coefficients", "content": "Set the matrix coefficient. Available values are:\n\nauto\nKeep the same colorspace property (default).\n\nunknown\nbt709\nsmpte170m\nBT 601\n\nbt2020nc\n\nSet Rec709 colorspace for each frame of the file\n\nffmpeg -i INPUT -c copy -bsf:v proresmetadata=colorprimaries=bt709:colortrc=bt709:colorspace=bt709 output.mov\n\nSet Hybrid Log-Gamma parameters for each frame of the file\n\nffmpeg -i INPUT -c copy -bsf:v proresmetadata=colorprimaries=bt2020:colortrc=arib-std-b67:colorspace=bt2020nc output.mov\n" }, { "name": "remove_extra", "content": "Remove extradata from packets.\n\nIt accepts the following parameter:\n" }, { "name": "freq", "content": "Set which frame types to remove extradata from.\n\nk Remove extradata from non-keyframes only.\n\nkeyframe\nRemove extradata from keyframes only.\n\ne, all\nRemove extradata from all frames.\n" }, { "name": "setts", "content": "Set PTS and DTS in packets.\n\nIt accepts the following parameters:\n\nts" }, { "name": "pts", "content": "dts Set expressions for PTS, DTS or both.\n" }, { "name": "duration", "content": "Set expression for duration.\n" }, { "name": "time_base", "content": "Set output time base.\n\nThe expressions are evaluated through the eval API and can contain the following constants:\n\nN The count of the input packet. Starting from 0.\n\nTS The demux timestamp in input in case of \"ts\" or \"dts\" option or presentation timestamp in\ncase of \"pts\" option.\n\nPOS The original position in the file of the packet, or undefined if undefined for the\ncurrent packet\n\nDTS The demux timestamp in input.\n\nPTS The presentation timestamp in input.\n\nDURATION\nThe duration in input.\n\nSTARTDTS\nThe DTS of the first packet.\n\nSTARTPTS\nThe PTS of the first packet.\n\nPREVINDTS\nThe previous input DTS.\n\nPREVINPTS\nThe previous input PTS.\n\nPREVINDURATION\nThe previous input duration.\n\nPREVOUTDTS\nThe previous output DTS.\n\nPREVOUTPTS\nThe previous output PTS.\n\nPREVOUTDURATION\nThe previous output duration.\n\nNEXTDTS\nThe next input DTS.\n\nNEXTPTS\nThe next input PTS.\n\nNEXTDURATION\nThe next input duration.\n\nTB The timebase of stream packet belongs.\n\nTBOUT\nThe output timebase.\n\nSR The sample rate of stream packet belongs.\n\nNOPTS\nThe AVNOPTSVALUE constant.\n" }, { "name": "text2movsub", "content": "Convert text subtitles to MOV subtitles (as used by the \"movtext\" codec) with metadata\nheaders.\n\nSee also the mov2textsub filter.\n" }, { "name": "trace_headers", "content": "Log trace output containing all syntax elements in the coded stream headers (everything above\nthe level of individual coded blocks). This can be useful for debugging low-level stream\nissues.\n\nSupports AV1, H.264, H.265, (M)JPEG, MPEG-2 and VP9, but depending on the build only a subset\nof these may be available.\n" }, { "name": "truehd_core", "content": "Extract the core from a TrueHD stream, dropping ATMOS data.\n" }, { "name": "vp9_metadata", "content": "Modify metadata embedded in a VP9 stream.\n" }, { "name": "color_space", "content": "Set the color space value in the frame header. Note that any frame set to RGB will be\nimplicitly set to PC range and that RGB is incompatible with profiles 0 and 2.\n\nunknown\nbt601\nbt709\nsmpte170\nsmpte240\nbt2020\nrgb" }, { "name": "color_range", "content": "Set the color range value in the frame header. Note that any value imposed by the color\nspace will take precedence over this value.\n\ntv\npc\n" }, { "name": "vp9_superframe", "content": "Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This fixes merging of\nsplit/segmented VP9 streams where the alt-ref frame was split from its visible counterpart.\n" }, { "name": "vp9_superframe_split", "content": "Split VP9 superframes into single frames.\n" }, { "name": "vp9_raw_reorder", "content": "Given a VP9 stream with correct timestamps but possibly out of order, insert additional show-\nexisting-frame packets to correct the ordering.\n" } ] }, "FORMAT OPTIONS": { "content": "The libavformat library provides some generic global options, which can be set on all the\nmuxers and demuxers. In addition each muxer or demuxer may support so-called private options,\nwhich are specific for that component.\n\nOptions may be set by specifying -option value in the FFmpeg tools, or by setting the value\nexplicitly in the \"AVFormatContext\" options or using the libavutil/opt.h API for programmatic\nuse.\n\nThe list of supported options follows:\n\navioflags flags (input/output)\nPossible values:\n\ndirect\nReduce buffering.\n\nprobesize integer (input)\nSet probing size in bytes, i.e. the size of the data to analyze to get stream\ninformation. A higher value will enable detecting more information in case it is\ndispersed into the stream, but will increase latency. Must be an integer not lesser than\n32. It is 5000000 by default.\n\nmaxprobepackets integer (input)\nSet the maximum number of buffered packets when probing a codec. Default is 2500\npackets.\n\npacketsize integer (output)\nSet packet size.\n\nfflags flags\nSet format flags. Some are implemented for a limited number of formats.\n\nPossible values for input files:\n\ndiscardcorrupt\nDiscard corrupted packets.\n\nfastseek\nEnable fast, but inaccurate seeks for some formats.\n\ngenpts\nGenerate missing PTS if DTS is present.\n\nigndts\nIgnore DTS if PTS is set. Inert when nofillin is set.\n\nignidx\nIgnore index.\n\nnobuffer\nReduce the latency introduced by buffering during initial input streams analysis.\n\nnofillin\nDo not fill in missing values in packet fields that can be exactly calculated.\n\nnoparse\nDisable AVParsers, this needs \"+nofillin\" too.\n\nsortdts\nTry to interleave output packets by DTS. At present, available only for AVIs with an\nindex.\n\nPossible values for output files:\n\nautobsf\nAutomatically apply bitstream filters as required by the output format. Enabled by\ndefault.\n\nbitexact\nOnly write platform-, build- and time-independent data. This ensures that file and\ndata checksums are reproducible and match between platforms. Its primary use is for\nregression testing.\n\nflushpackets\nWrite out packets immediately.\n\nshortest\nStop muxing at the end of the shortest stream. It may be needed to increase\nmaxinterleavedelta to avoid flushing the longer streams before EOF.\n\nseek2any integer (input)\nAllow seeking to non-keyframes on demuxer level when supported if set to 1. Default is\n0.\n\nanalyzeduration integer (input)\nSpecify how many microseconds are analyzed to probe the input. A higher value will enable\ndetecting more accurate information, but will increase latency. It defaults to 5,000,000\nmicroseconds = 5 seconds.\n\ncryptokey hexadecimal string (input)\nSet decryption key.\n\nindexmem integer (input)\nSet max memory used for timestamp index (per stream).\n\nrtbufsize integer (input)\nSet max memory used for buffering real-time frames.\n\nfdebug flags (input/output)\nPrint specific debug info.\n\nPossible values:\n\nts\nmaxdelay integer (input/output)\nSet maximum muxing or demuxing delay in microseconds.\n\nfpsprobesize integer (input)\nSet number of frames used to probe fps.\n\naudiopreload integer (output)\nSet microseconds by which audio packets should be interleaved earlier.\n\nchunkduration integer (output)\nSet microseconds for each chunk.\n\nchunksize integer (output)\nSet size in bytes for each chunk.\n\nerrdetect, ferrdetect flags (input)\nSet error detection flags. \"ferrdetect\" is deprecated and should be used only via the\nffmpeg tool.\n\nPossible values:\n\ncrccheck\nVerify embedded CRCs.\n\nbitstream\nDetect bitstream specification deviations.\n\nbuffer\nDetect improper bitstream length.\n\nexplode\nAbort decoding on minor error detection.\n\ncareful\nConsider things that violate the spec and have not been seen in the wild as errors.\n\ncompliant\nConsider all spec non compliancies as errors.\n\naggressive\nConsider things that a sane encoder should not do as an error.\n\nmaxinterleavedelta integer (output)\nSet maximum buffering duration for interleaving. The duration is expressed in\nmicroseconds, and defaults to 10000000 (10 seconds).\n\nTo ensure all the streams are interleaved correctly, libavformat will wait until it has\nat least one packet for each stream before actually writing any packets to the output\nfile. When some streams are \"sparse\" (i.e. there are large gaps between successive\npackets), this can result in excessive buffering.\n\nThis field specifies the maximum difference between the timestamps of the first and the\nlast packet in the muxing queue, above which libavformat will output a packet regardless\nof whether it has queued a packet for all the streams.\n\nIf set to 0, libavformat will continue buffering packets until it has a packet for each\nstream, regardless of the maximum timestamp difference between the buffered packets.\n\nusewallclockastimestamps integer (input)\nUse wallclock as timestamps if set to 1. Default is 0.\n\navoidnegativets integer (output)\nPossible values:\n\nmakenonnegative\nShift timestamps to make them non-negative. Also note that this affects only leading\nnegative timestamps, and not non-monotonic negative timestamps.\n\nmakezero\nShift timestamps so that the first timestamp is 0.\n\nauto (default)\nEnables shifting when required by the target format.\n\ndisabled\nDisables shifting of timestamp.\n\nWhen shifting is enabled, all output timestamps are shifted by the same amount. Audio,\nvideo, and subtitles desynching and relative timestamp differences are preserved compared\nto how they would have been without shifting.\n\nskipinitialbytes integer (input)\nSet number of bytes to skip before reading header and frames if set to 1. Default is 0.\n\ncorrecttsoverflow integer (input)\nCorrect single timestamp overflows if set to 1. Default is 1.\n\nflushpackets integer (output)\nFlush the underlying I/O stream after each packet. Default is -1 (auto), which means that\nthe underlying protocol will decide, 1 enables it, and has the effect of reducing the\nlatency, 0 disables it and may increase IO throughput in some cases.\n\noutputtsoffset offset (output)\nSet the output time offset.\n\noffset must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual.\n\nThe offset is added by the muxer to the output timestamps.\n\nSpecifying a positive offset means that the corresponding streams are delayed bt the time\nduration specified in offset. Default value is 0 (meaning that no offset is applied).\n\nformatwhitelist list (input)\n\",\" separated list of allowed demuxers. By default all are allowed.\n\ndumpseparator string (input)\nSeparator used to separate the fields printed on the command line about the Stream\nparameters. For example, to separate the fields with newlines and indentation:\n\nffprobe -dumpseparator \"\n\" -i ~/videos/matrixbenchmpeg2.mpg\n\nmaxstreams integer (input)\nSpecifies the maximum number of streams. This can be used to reject files that would\nrequire too many resources due to a large number of streams.\n\nskipestimatedurationfrompts bool (input)\nSkip estimation of input duration when calculated using PTS. At present, applicable for\nMPEG-PS and MPEG-TS.\n\nstrict, fstrict integer (input/output)\nSpecify how strictly to follow the standards. \"fstrict\" is deprecated and should be used\nonly via the ffmpeg tool.\n\nPossible values:\n\nvery\nstrictly conform to an older more strict version of the spec or reference software\n\nstrict\nstrictly conform to all the things in the spec no matter what consequences\n\nnormal\nunofficial\nallow unofficial extensions\n\nexperimental\nallow non standardized experimental things, experimental (unfinished/work in\nprogress/not well tested) decoders and encoders. Note: experimental decoders can\npose a security risk, do not use this for decoding untrusted input.\n", "subsections": [ { "name": "Format stream specifiers", "content": "Format stream specifiers allow selection of one or more streams that match specific\nproperties.\n\nThe exact semantics of stream specifiers is defined by the avformatmatchstreamspecifier()\nfunction declared in the libavformat/avformat.h header and documented in the Stream\nspecifiers section in the ffmpeg(1) manual.\n" } ] }, "DEMUXERS": { "content": "Demuxers are configured elements in FFmpeg that can read the multimedia streams from a\nparticular type of file.\n\nWhen you configure your FFmpeg build, all the supported demuxers are enabled by default. You\ncan list all available ones using the configure option \"--list-demuxers\".\n\nYou can disable all the demuxers using the configure option \"--disable-demuxers\", and\nselectively enable a single demuxer with the option \"--enable-demuxer=DEMUXER\", or disable it\nwith the option \"--disable-demuxer=DEMUXER\".\n\nThe option \"-demuxers\" of the ff* tools will display the list of enabled demuxers. Use\n\"-formats\" to view a combined list of enabled demuxers and muxers.\n\nThe description of some of the currently available demuxers follows.\n\naa\nAudible Format 2, 3, and 4 demuxer.\n\nThis demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.\n", "subsections": [ { "name": "aac", "content": "Raw Audio Data Transport Stream AAC demuxer.\n\nThis demuxer is used to demux an ADTS input containing a single AAC stream alongwith any\nID3v1/2 or APE tags in it.\n" }, { "name": "apng", "content": "Animated Portable Network Graphics demuxer.\n\nThis demuxer is used to demux APNG files. All headers, but the PNG signature, up to (but not\nincluding) the first fcTL chunk are transmitted as extradata. Frames are then split as being\nall the chunks between two fcTL ones, or between the last fcTL and IEND chunks.\n" }, { "name": "-ignore_loop _", "content": "Ignore the loop variable in the file if set. Default is enabled.\n" }, { "name": "-max_fps _", "content": "Maximum framerate in frames per second. Default of 0 imposes no limit.\n" }, { "name": "-default_fps _", "content": "Default framerate in frames per second when none is specified in the file (0 meaning as\nfast as possible). Default is 15.\n" }, { "name": "asf", "content": "Advanced Systems Format demuxer.\n\nThis demuxer is used to demux ASF files and MMS network streams.\n" }, { "name": "-no_resync_search _", "content": "Do not try to resynchronize by looking for a certain optional start code.\n" }, { "name": "concat", "content": "Virtual concatenation script demuxer.\n\nThis demuxer reads a list of files and other directives from a text file and demuxes them one\nafter the other, as if all their packets had been muxed together.\n\nThe timestamps in the files are adjusted so that the first file starts at 0 and each next\nfile starts where the previous one finishes. Note that it is done globally and may cause gaps\nif all streams do not have exactly the same length.\n\nAll files must have the same streams (same codecs, same time base, etc.).\n\nThe duration of each file is used to adjust the timestamps of the next file: if the duration\nis incorrect (because it was computed using the bit-rate or because the file is truncated,\nfor example), it can cause artifacts. The \"duration\" directive can be used to override the\nduration stored in each file.\n\nSyntax\n\nThe script is a text file in extended-ASCII, with one directive per line. Empty lines,\nleading spaces and lines starting with '#' are ignored. The following directive is\nrecognized:\n" }, { "name": "\"file path\"", "content": "Path to a file to read; special characters and spaces must be escaped with backslash or\nsingle quotes.\n\nAll subsequent file-related directives apply to that file.\n" }, { "name": "\"ffconcat version 1.0\"", "content": "Identify the script type and version.\n\nTo make FFmpeg recognize the format automatically, this directive must appear exactly as\nis (no extra space or byte-order-mark) on the very first line of the script.\n" }, { "name": "\"duration dur\"", "content": "Duration of the file. This information can be specified from the file; specifying it here\nmay be more efficient or help if the information from the file is not available or\naccurate.\n\nIf the duration is set for all files, then it is possible to seek in the whole\nconcatenated video.\n" }, { "name": "\"inpoint timestamp\"", "content": "In point of the file. When the demuxer opens the file it instantly seeks to the specified\ntimestamp. Seeking is done so that all streams can be presented successfully at In point.\n\nThis directive works best with intra frame codecs, because for non-intra frame ones you\nwill usually get extra packets before the actual In point and the decoded content will\nmost likely contain frames before In point too.\n\nFor each file, packets before the file In point will have timestamps less than the\ncalculated start timestamp of the file (negative in case of the first file), and the\nduration of the files (if not specified by the \"duration\" directive) will be reduced\nbased on their specified In point.\n\nBecause of potential packets before the specified In point, packet timestamps may overlap\nbetween two concatenated files.\n" }, { "name": "\"outpoint timestamp\"", "content": "Out point of the file. When the demuxer reaches the specified decoding timestamp in any\nof the streams, it handles it as an end of file condition and skips the current and all\nthe remaining packets from all streams.\n\nOut point is exclusive, which means that the demuxer will not output packets with a\ndecoding timestamp greater or equal to Out point.\n\nThis directive works best with intra frame codecs and formats where all streams are\ntightly interleaved. For non-intra frame codecs you will usually get additional packets\nwith presentation timestamp after Out point therefore the decoded content will most\nlikely contain frames after Out point too. If your streams are not tightly interleaved\nyou may not get all the packets from all streams before Out point and you may only will\nbe able to decode the earliest stream until Out point.\n\nThe duration of the files (if not specified by the \"duration\" directive) will be reduced\nbased on their specified Out point.\n" }, { "name": "\"file_packet_metadata key=value\"", "content": "Metadata of the packets of the file. The specified metadata will be set for each file\npacket. You can specify this directive multiple times to add multiple metadata entries.\nThis directive is deprecated, use \"filepacketmeta\" instead.\n" }, { "name": "\"file_packet_meta key value\"", "content": "Metadata of the packets of the file. The specified metadata will be set for each file\npacket. You can specify this directive multiple times to add multiple metadata entries.\n" }, { "name": "\"option key value\"", "content": "Option to access, open and probe the file. Can be present multiple times.\n" }, { "name": "\"stream\"", "content": "Introduce a stream in the virtual file. All subsequent stream-related directives apply\nto the last introduced stream. Some streams properties must be set in order to allow\nidentifying the matching streams in the subfiles. If no streams are defined in the\nscript, the streams from the first file are copied.\n" }, { "name": "\"exact_stream_id id\"", "content": "Set the id of the stream. If this directive is given, the string with the corresponding\nid in the subfiles will be used. This is especially useful for MPEG-PS (VOB) files,\nwhere the order of the streams is not reliable.\n" }, { "name": "\"stream_meta key value\"", "content": "Metadata for the stream. Can be present multiple times.\n" }, { "name": "\"stream_codec value\"", "content": "Codec for the stream.\n" }, { "name": "\"stream_extradata hex_string\"", "content": "Extradata for the string, encoded in hexadecimal.\n" }, { "name": "\"chapter id start end\"", "content": "Add a chapter. id is an unique identifier, possibly small and consecutive.\n\nOptions\n\nThis demuxer accepts the following option:\n" }, { "name": "safe", "content": "If set to 1, reject unsafe file paths and directives. A file path is considered safe if\nit does not contain a protocol specification and is relative and all components only\ncontain characters from the portable character set (letters, digits, period, underscore\nand hyphen) and have no period at the beginning of a component.\n\nIf set to 0, any file name is accepted.\n\nThe default is 1.\n" }, { "name": "auto_convert", "content": "If set to 1, try to perform automatic conversions on packet data to make the streams\nconcatenable. The default is 1.\n\nCurrently, the only conversion is adding the h264mp4toannexb bitstream filter to H.264\nstreams in MP4 format. This is necessary in particular if there are resolution changes.\n" }, { "name": "segment_time_metadata", "content": "If set to 1, every packet will contain the lavf.concat.starttime and the\nlavf.concat.duration packet metadata values which are the starttime and the duration of\nthe respective file segments in the concatenated output expressed in microseconds. The\nduration metadata is only set if it is known based on the concat file. The default is 0.\n\nExamples\n\n• Use absolute filenames and include some comments:\n\n# my first filename\nfile /mnt/share/file-1.wav\n# my second filename including whitespace\nfile '/mnt/share/file 2.wav'\n# my third filename including whitespace plus single quote\nfile '/mnt/share/file 3'\\''.wav'\n\n• Allow for input format auto-probing, use safe filenames and set the duration of the first\nfile:\n\nffconcat version 1.0\n\nfile file-1.wav\nduration 20.0\n\nfile subdir/file-2.wav\n" }, { "name": "dash", "content": "Dynamic Adaptive Streaming over HTTP demuxer.\n\nThis demuxer presents all AVStreams found in the manifest. By setting the discard flags on\nAVStreams the caller can decide which streams to actually receive. Each stream mirrors the\n\"id\" and \"bandwidth\" properties from the \"\" as metadata keys named \"id\" and\n\"variantbitrate\" respectively.\n\nOptions\n\nThis demuxer accepts the following option:\n" }, { "name": "cenc_decryption_key", "content": "16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128\nCTR; ISO/IEC 23001-7).\n\nea\nElectronic Arts Multimedia format demuxer.\n\nThis format is used by various Electronic Arts games.\n\nOptions\n\nmergealpha bool\nNormally the VP6 alpha channel (if exists) is returned as a secondary video stream, by\nsetting this option you can make the demuxer return a single video stream which contains\nthe alpha channel in addition to the ordinary video.\n" }, { "name": "imf", "content": "Interoperable Master Format demuxer.\n\nThis demuxer presents audio and video streams found in an IMF Composition, as specified in\n.\n\nffmpeg [-assetmaps ,,...] -i ...\n\nIf \"-assetmaps\" is not specified, the demuxer looks for a file called ASSETMAP.xml in the\nsame directory as the CPL.\n" }, { "name": "flv, live_flv, kux", "content": "Adobe Flash Video Format demuxer.\n\nThis demuxer is used to demux FLV files and RTMP network streams. In case of live network\nstreams, if you force format, you may use liveflv option instead of flv to survive timestamp\ndiscontinuities. KUX is a flv variant used on the Youku platform.\n\nffmpeg -f flv -i myfile.flv ...\nffmpeg -f liveflv -i rtmp:///anything/key ....\n" }, { "name": "-flv_metadata _", "content": "Allocate the streams according to the onMetaData array content.\n" }, { "name": "-flv_ignore_prevtag _", "content": "Ignore the size of previous tag value.\n" }, { "name": "-flv_full_metadata _", "content": "Output all context of the onMetadata.\n" }, { "name": "gif", "content": "Animated GIF demuxer.\n\nIt accepts the following options:\n" }, { "name": "min_delay", "content": "Set the minimum valid delay between frames in hundredths of seconds. Range is 0 to 6000.\nDefault value is 2.\n" }, { "name": "max_gif_delay", "content": "Set the maximum valid delay between frames in hundredth of seconds. Range is 0 to 65535.\nDefault value is 65535 (nearly eleven minutes), the maximum value allowed by the\nspecification.\n" }, { "name": "default_delay", "content": "Set the default delay between frames in hundredths of seconds. Range is 0 to 6000.\nDefault value is 10.\n" }, { "name": "ignore_loop", "content": "GIF files can contain information to loop a certain number of times (or infinitely). If\nignoreloop is set to 1, then the loop setting from the input will be ignored and looping\nwill not occur. If set to 0, then looping will occur and will cycle the number of times\naccording to the GIF. Default value is 1.\n\nFor example, with the overlay filter, place an infinitely looping GIF over another video:\n\nffmpeg -i input.mp4 -ignoreloop 0 -i input.gif -filtercomplex overlay=shortest=1 out.mkv\n\nNote that in the above example the shortest option for overlay filter is used to end the\noutput video at the length of the shortest input file, which in this case is input.mp4 as the\nGIF in this example loops infinitely.\n" }, { "name": "hls", "content": "HLS demuxer\n\nApple HTTP Live Streaming demuxer.\n\nThis demuxer presents all AVStreams from all variant streams. The id field is set to the\nbitrate variant index number. By setting the discard flags on AVStreams (by pressing 'a' or\n'v' in ffplay), the caller can decide which variant streams to actually receive. The total\nbitrate of the variant that the stream belongs to is available in a metadata key named\n\"variantbitrate\".\n\nIt accepts the following options:\n" }, { "name": "live_start_index", "content": "segment index to start live streams at (negative values are from the end).\n" }, { "name": "prefer_x_start", "content": "prefer to use #EXT-X-START if it's in playlist instead of livestartindex.\n" }, { "name": "allowed_extensions", "content": "',' separated list of file extensions that hls is allowed to access.\n" }, { "name": "max_reload", "content": "Maximum number of times a insufficient list is attempted to be reloaded. Default value\nis 1000.\n" }, { "name": "m3u8_hold_counters", "content": "The maximum number of times to load m3u8 when it refreshes without new segments. Default\nvalue is 1000.\n" }, { "name": "http_persistent", "content": "Use persistent HTTP connections. Applicable only for HTTP streams. Enabled by default.\n" }, { "name": "http_multiple", "content": "Use multiple HTTP connections for downloading HTTP segments. Enabled by default for\nHTTP/1.1 servers.\n" }, { "name": "http_seekable", "content": "Use HTTP partial requests for downloading HTTP segments. 0 = disable, 1 = enable, -1 =\nauto, Default is auto.\n" }, { "name": "seg_format_options", "content": "Set options for the demuxer of media segments using a list of key=value pairs separated\nby \":\".\n" }, { "name": "seg_max_retry", "content": "Maximum number of times to reload a segment on error, useful when segment skip on network\nerror is not desired. Default value is 0.\n" }, { "name": "image2", "content": "Image file demuxer.\n\nThis demuxer reads from a list of image files specified by a pattern. The syntax and meaning\nof the pattern is specified by the option patterntype.\n\nThe pattern may contain a suffix which is used to automatically determine the format of the\nimages contained in the files.\n\nThe size, the pixel format, and the format of each image must be the same for all the files\nin the sequence.\n\nThis demuxer accepts the following options:\n" }, { "name": "framerate", "content": "Set the frame rate for the video stream. It defaults to 25.\n" }, { "name": "loop", "content": "If set to 1, loop over the input. Default value is 0.\n" }, { "name": "pattern_type", "content": "Select the pattern type used to interpret the provided filename.\n\npatterntype accepts one of the following values.\n\nnone\nDisable pattern matching, therefore the video will only contain the specified image.\nYou should use this option if you do not want to create sequences from multiple\nimages and your filenames may contain special pattern characters.\n\nsequence\nSelect a sequence pattern type, used to specify a sequence of files indexed by\nsequential numbers.\n\nA sequence pattern may contain the string \"%d\" or \"%0Nd\", which specifies the\nposition of the characters representing a sequential number in each filename matched\nby the pattern. If the form \"%d0Nd\" is used, the string representing the number in\neach filename is 0-padded and N is the total number of 0-padded digits representing\nthe number. The literal character '%' can be specified in the pattern with the string\n\"%%\".\n\nIf the sequence pattern contains \"%d\" or \"%0Nd\", the first filename of the file list\nspecified by the pattern must contain a number inclusively contained between\nstartnumber and startnumber+startnumberrange-1, and all the following numbers\nmust be sequential.\n\nFor example the pattern \"img-%03d.bmp\" will match a sequence of filenames of the form\nimg-001.bmp, img-002.bmp, ..., img-010.bmp, etc.; the pattern \"i%%m%%g-%d.jpg\" will\nmatch a sequence of filenames of the form i%m%g-1.jpg, i%m%g-2.jpg, ...,\ni%m%g-10.jpg, etc.\n\nNote that the pattern must not necessarily contain \"%d\" or \"%0Nd\", for example to\nconvert a single image file img.jpeg you can employ the command:\n\nffmpeg -i img.jpeg img.png\n\nglob\nSelect a glob wildcard pattern type.\n\nThe pattern is interpreted like a glob() pattern. This is only selectable if\nlibavformat was compiled with globbing support.\n\nglobsequence (deprecated, will be removed)\nSelect a mixed glob wildcard/sequence pattern.\n\nIf your version of libavformat was compiled with globbing support, and the provided\npattern contains at least one glob meta character among \"%*?[]{}\" that is preceded by\nan unescaped \"%\", the pattern is interpreted like a glob() pattern, otherwise it is\ninterpreted like a sequence pattern.\n\nAll glob special characters \"%*?[]{}\" must be prefixed with \"%\". To escape a literal\n\"%\" you shall use \"%%\".\n\nFor example the pattern \"foo-%*.jpeg\" will match all the filenames prefixed by \"foo-\"\nand terminating with \".jpeg\", and \"foo-%?%?%?.jpeg\" will match all the filenames\nprefixed with \"foo-\", followed by a sequence of three characters, and terminating\nwith \".jpeg\".\n\nThis pattern type is deprecated in favor of glob and sequence.\n\nDefault value is globsequence.\n" }, { "name": "pixel_format", "content": "Set the pixel format of the images to read. If not specified the pixel format is guessed\nfrom the first image file in the sequence.\n" }, { "name": "start_number", "content": "Set the index of the file matched by the image file pattern to start to read from.\nDefault value is 0.\n" }, { "name": "start_number_range", "content": "Set the index interval range to check when looking for the first image file in the\nsequence, starting from startnumber. Default value is 5.\n" }, { "name": "ts_from_file", "content": "If set to 1, will set frame timestamp to modification time of image file. Note that\nmonotonity of timestamps is not provided: images go in the same order as without this\noption. Default value is 0. If set to 2, will set frame timestamp to the modification\ntime of the image file in nanosecond precision.\n" }, { "name": "video_size", "content": "Set the video size of the images to read. If not specified the video size is guessed from\nthe first image file in the sequence.\n" }, { "name": "export_path_metadata", "content": "If set to 1, will add two extra fields to the metadata found in input, making them also\navailable for other filters (see drawtext filter for examples). Default value is 0. The\nextra fields are described below:\n\nlavf.image2dec.sourcepath\nCorresponds to the full path to the input file being read.\n\nlavf.image2dec.sourcebasename\nCorresponds to the name of the file being read.\n\nExamples\n\n• Use ffmpeg for creating a video from the images in the file sequence img-001.jpeg,\nimg-002.jpeg, ..., assuming an input frame rate of 10 frames per second:\n\nffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv\n\n• As above, but start by reading from a file with index 100 in the sequence:\n\nffmpeg -framerate 10 -startnumber 100 -i 'img-%03d.jpeg' out.mkv\n\n• Read images matching the \"*.png\" glob pattern , that is all the files terminating with\nthe \".png\" suffix:\n\nffmpeg -framerate 10 -patterntype glob -i \"*.png\" out.mkv\n" }, { "name": "libgme", "content": "The Game Music Emu library is a collection of video game music file emulators.\n\nSee for more information.\n\nIt accepts the following options:\n" }, { "name": "track_index", "content": "Set the index of which track to demux. The demuxer can only export one track. Track\nindexes start at 0. Default is to pick the first track. Number of tracks is exported as\ntracks metadata entry.\n" }, { "name": "sample_rate", "content": "Set the sampling rate of the exported track. Range is 1000 to 999999. Default is 44100.\n" }, { "name": "max_size _(bytes)", "content": "The demuxer buffers the entire file into memory. Adjust this value to set the maximum\nbuffer size, which in turn, acts as a ceiling for the size of files that can be read.\nDefault is 50 MiB.\n" }, { "name": "libmodplug", "content": "ModPlug based module demuxer\n\nSee \n\nIt will export one 2-channel 16-bit 44.1 kHz audio stream. Optionally, a \"pal8\" 16-color\nvideo stream can be exported with or without printed metadata.\n\nIt accepts the following options:\n" }, { "name": "noise_reduction", "content": "Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default is 0.\n" }, { "name": "reverb_depth", "content": "Set amount of reverb. Range 0-100. Default is 0.\n" }, { "name": "reverb_delay", "content": "Set delay in ms, clamped to 40-250 ms. Default is 0.\n" }, { "name": "bass_amount", "content": "Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet) to 100 (loud). Default\nis 0.\n" }, { "name": "bass_range", "content": "Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100 Hz. Default is 0.\n" }, { "name": "surround_depth", "content": "Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100 (heavy). Default is 0.\n" }, { "name": "surround_delay", "content": "Set surround delay in ms, clamped to 5-40 ms. Default is 0.\n" }, { "name": "max_size", "content": "The demuxer buffers the entire file into memory. Adjust this value to set the maximum\nbuffer size, which in turn, acts as a ceiling for the size of files that can be read.\nRange is 0 to 100 MiB. 0 removes buffer size limit (not recommended). Default is 5 MiB.\n" }, { "name": "video_stream_expr", "content": "String which is evaluated using the eval API to assign colors to the generated video\nstream. Variables which can be used are \"x\", \"y\", \"w\", \"h\", \"t\", \"speed\", \"tempo\",\n\"order\", \"pattern\" and \"row\".\n" }, { "name": "video_stream", "content": "Generate video stream. Can be 1 (on) or 0 (off). Default is 0.\n" }, { "name": "video_stream_w", "content": "Set video frame width in 'chars' where one char indicates 8 pixels. Range is 20-512.\nDefault is 30.\n" }, { "name": "video_stream_h", "content": "Set video frame height in 'chars' where one char indicates 8 pixels. Range is 20-512.\nDefault is 30.\n" }, { "name": "video_stream_ptxt", "content": "Print metadata on video stream. Includes \"speed\", \"tempo\", \"order\", \"pattern\", \"row\" and\n\"ts\" (time in ms). Can be 1 (on) or 0 (off). Default is 1.\n" }, { "name": "libopenmpt", "content": "libopenmpt based module demuxer\n\nSee for more information.\n\nSome files have multiple subsongs (tracks) this can be set with the subsong option.\n\nIt accepts the following options:\n" }, { "name": "subsong", "content": "Set the subsong index. This can be either 'all', 'auto', or the index of the subsong.\nSubsong indexes start at 0. The default is 'auto'.\n\nThe default value is to let libopenmpt choose.\n" }, { "name": "layout", "content": "Set the channel layout. Valid values are 1, 2, and 4 channel layouts. The default value\nis STEREO.\n" }, { "name": "sample_rate", "content": "Set the sample rate for libopenmpt to output. Range is from 1000 to INTMAX. The value\ndefault is 48000.\n" }, { "name": "mov/mp4/3gp", "content": "Demuxer for Quicktime File Format & ISO/IEC Base Media File Format (ISO/IEC 14496-12 or\nMPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part 12).\n\nRegistered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism, ismv, isma, f4v\n\nOptions\n\nThis demuxer accepts the following options:\n" }, { "name": "enable_drefs", "content": "Enable loading of external tracks, disabled by default. Enabling this can theoretically\nleak information in some use cases.\n" }, { "name": "use_absolute_path", "content": "Allows loading of external tracks via absolute paths, disabled by default. Enabling this\nposes a security risk. It should only be enabled if the source is known to be non-\nmalicious.\n" }, { "name": "seek_streams_individually", "content": "When seeking, identify the closest point in each stream individually and demux packets in\nthat stream from identified point. This can lead to a different sequence of packets\ncompared to demuxing linearly from the beginning. Default is true.\n" }, { "name": "ignore_editlist", "content": "Ignore any edit list atoms. The demuxer, by default, modifies the stream index to reflect\nthe timeline described by the edit list. Default is false.\n" }, { "name": "advanced_editlist", "content": "Modify the stream index to reflect the timeline described by the edit list.\n\"ignoreeditlist\" must be set to false for this option to be effective. If both\n\"ignoreeditlist\" and this option are set to false, then only the start of the stream\nindex is modified to reflect initial dwell time or starting timestamp described by the\nedit list. Default is true.\n" }, { "name": "ignore_chapters", "content": "Don't parse chapters. This includes GoPro 'HiLight' tags/moments. Note that chapters are\nonly parsed when input is seekable. Default is false.\n" }, { "name": "use_mfra_for", "content": "For seekable fragmented input, set fragment's starting timestamp from media fragment\nrandom access box, if present.\n\nFollowing options are available:\n\nauto\nAuto-detect whether to set mfra timestamps as PTS or DTS (default)\n\ndts Set mfra timestamps as DTS\n\npts Set mfra timestamps as PTS\n\n0 Don't use mfra box to set timestamps\n" }, { "name": "use_tfdt", "content": "For fragmented input, set fragment's starting timestamp to \"baseMediaDecodeTime\" from the\n\"tfdt\" box. Default is enabled, which will prefer to use the \"tfdt\" box to set DTS.\nDisable to use the \"earliestpresentationtime\" from the \"sidx\" box. In either case, the\ntimestamp from the \"mfra\" box will be used if it's available and \"usemfrafor\" is set to\npts or dts.\n" }, { "name": "export_all", "content": "Export unrecognized boxes within the udta box as metadata entries. The first four\ncharacters of the box type are set as the key. Default is false.\n" }, { "name": "export_xmp", "content": "Export entire contents of XMP box and uuid box as a string with key \"xmp\". Note that if\n\"exportall\" is set and this option isn't, the contents of XMP box are still exported\nbut with key \"XMP\". Default is false.\n" }, { "name": "activation_bytes", "content": "4-byte key required to decrypt Audible AAX and AAX+ files. See Audible AAX subsection\nbelow.\n" }, { "name": "audible_fixed_key", "content": "Fixed key used for handling Audible AAX/AAX+ files. It has been pre-set so should not be\nnecessary to specify.\n" }, { "name": "decryption_key", "content": "16-byte key, in hex, to decrypt files encrypted using ISO Common Encryption (CENC/AES-128\nCTR; ISO/IEC 23001-7).\n" }, { "name": "max_stts_delta", "content": "Very high sample deltas written in a trak's stts box may occasionally be intended but\nusually they are written in error or used to store a negative value for dts correction\nwhen treated as signed 32-bit integers. This option lets the user set an upper limit,\nbeyond which the delta is clamped to 1. Values greater than the limit if negative when\ncast to int32 are used to adjust onward dts.\n\nUnit is the track time scale. Range is 0 to UINTMAX. Default is \"UINTMAX - 48000*10\"\nwhich allows upto a 10 second dts correction for 48 kHz audio streams while accommodating\n99.9% of \"uint32\" range.\n" }, { "name": "interleaved_read", "content": "Interleave packets from multiple tracks at demuxer level. For badly interleaved files,\nthis prevents playback issues caused by large gaps between packets in different tracks,\nas MOV/MP4 do not have packet placement requirements. However, this can cause excessive\nseeking on very badly interleaved files, due to seeking between tracks, so disabling it\nmay prevent I/O issues, at the expense of playback.\n\nAudible AAX\n\nAudible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte\nactivation secret.\n\nffmpeg -activationbytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4\n" }, { "name": "mpegts", "content": "MPEG-2 transport stream demuxer.\n\nThis demuxer accepts the following options:\n" }, { "name": "resync_size", "content": "Set size limit for looking up a new synchronization. Default value is 65536.\n" }, { "name": "skip_unknown_pmt", "content": "Skip PMTs for programs not defined in the PAT. Default value is 0.\n" }, { "name": "fix_teletext_pts", "content": "Override teletext packet PTS and DTS values with the timestamps calculated from the PCR\nof the first program which the teletext stream is part of and is not discarded. Default\nvalue is 1, set this option to 0 if you want your teletext packet PTS and DTS values\nuntouched.\n" }, { "name": "ts_packetsize", "content": "Output option carrying the raw packet size in bytes. Show the detected raw packet size,\ncannot be set by the user.\n" }, { "name": "scan_all_pmts", "content": "Scan and combine all PMTs. The value is an integer with value from -1 to 1 (-1 means\nautomatic setting, 1 means enabled, 0 means disabled). Default value is -1.\n" }, { "name": "merge_pmt_versions", "content": "Re-use existing streams when a PMT's version is updated and elementary streams move to\ndifferent PIDs. Default value is 0.\n" }, { "name": "max_packet_size", "content": "Set maximum size, in bytes, of packet emitted by the demuxer. Payloads above this size\nare split across multiple packets. Range is 1 to INTMAX/2. Default is 204800 bytes.\n" }, { "name": "mpjpeg", "content": "MJPEG encapsulated in multi-part MIME demuxer.\n\nThis demuxer allows reading of MJPEG, where each frame is represented as a part of\nmultipart/x-mixed-replace stream.\n" }, { "name": "strict_mime_boundary", "content": "Default implementation applies a relaxed standard to multi-part MIME boundary detection,\nto prevent regression with numerous existing endpoints not generating a proper MIME MJPEG\nstream. Turning this option on by setting it to 1 will result in a stricter check of the\nboundary value.\n" }, { "name": "rawvideo", "content": "Raw video demuxer.\n\nThis demuxer allows one to read raw video data. Since there is no header specifying the\nassumed video parameters, the user must specify them in order to be able to decode the data\ncorrectly.\n\nThis demuxer accepts the following options:\n" }, { "name": "framerate", "content": "Set input video frame rate. Default value is 25.\n" }, { "name": "pixel_format", "content": "Set the input video pixel format. Default value is \"yuv420p\".\n" }, { "name": "video_size", "content": "Set the input video size. This value must be specified explicitly.\n\nFor example to read a rawvideo file input.raw with ffplay, assuming a pixel format of\n\"rgb24\", a video size of \"320x240\", and a frame rate of 10 images per second, use the\ncommand:\n\nffplay -f rawvideo -pixelformat rgb24 -videosize 320x240 -framerate 10 input.raw\n" }, { "name": "sbg", "content": "SBaGen script demuxer.\n\nThis demuxer reads the script language used by SBaGen to generate\nbinaural beats sessions. A SBG script looks like that:\n\n-SE\na: 300-2.5/3 440+4.5/0\nb: 300-2.5/0 440+4.5/3\noff: -\nNOW == a\n+0:07:00 == b\n+0:14:00 == a\n+0:21:00 == b\n+0:30:00 off\n\nA SBG script can mix absolute and relative timestamps. If the script uses either only\nabsolute timestamps (including the script start time) or only relative ones, then its layout\nis fixed, and the conversion is straightforward. On the other hand, if the script mixes both\nkind of timestamps, then the NOW reference for relative timestamps will be taken from the\ncurrent time of day at the time the script is read, and the script layout will be frozen\naccording to that reference. That means that if the script is directly played, the actual\ntimes will match the absolute timestamps up to the sound controller's clock accuracy, but if\nthe user somehow pauses the playback or seeks, all times will be shifted accordingly.\n" }, { "name": "tedcaptions", "content": "JSON captions used for .\n\nTED does not provide links to the captions, but they can be guessed from the page. The file\ntools/bookmarklets.html from the FFmpeg source tree contains a bookmarklet to expose them.\n\nThis demuxer accepts the following option:\n" }, { "name": "start_time", "content": "Set the start time of the TED talk, in milliseconds. The default is 15000 (15s). It is\nused to sync the captions with the downloadable videos, because they include a 15s intro.\n\nExample: convert the captions to a format most players understand:\n\nffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt\n" }, { "name": "vapoursynth", "content": "Vapoursynth wrapper.\n\nDue to security concerns, Vapoursynth scripts will not be autodetected so the input format\nhas to be forced. For ff* CLI tools, add \"-f vapoursynth\" before the input \"-i\nyourscript.vpy\".\n\nThis demuxer accepts the following option:\n" }, { "name": "max_script_size", "content": "The demuxer buffers the entire script into memory. Adjust this value to set the maximum\nbuffer size, which in turn, acts as a ceiling for the size of scripts that can be read.\nDefault is 1 MiB.\n" } ] }, "MUXERS": { "content": "Muxers are configured elements in FFmpeg which allow writing multimedia streams to a\nparticular type of file.\n\nWhen you configure your FFmpeg build, all the supported muxers are enabled by default. You\ncan list all available muxers using the configure option \"--list-muxers\".\n\nYou can disable all the muxers with the configure option \"--disable-muxers\" and selectively\nenable / disable single muxers with the options \"--enable-muxer=MUXER\" /\n\"--disable-muxer=MUXER\".\n\nThe option \"-muxers\" of the ff* tools will display the list of enabled muxers. Use \"-formats\"\nto view a combined list of enabled demuxers and muxers.\n\nA description of some of the currently available muxers follows.\n", "subsections": [ { "name": "a64", "content": "A64 muxer for Commodore 64 video. Accepts a single \"a64multi\" or \"a64multi5\" codec video\nstream.\n" }, { "name": "adts", "content": "Audio Data Transport Stream muxer. It accepts a single AAC stream.\n\nOptions\n\nIt accepts the following options:\n\nwriteid3v2 bool\nEnable to write ID3v2.4 tags at the start of the stream. Default is disabled.\n\nwriteapetag bool\nEnable to write APE tags at the end of the stream. Default is disabled.\n\nwritempeg2 bool\nEnable to set MPEG version bit in the ADTS frame header to 1 which indicates MPEG-2.\nDefault is 0, which indicates MPEG-4.\n" }, { "name": "aiff", "content": "Audio Interchange File Format muxer.\n\nOptions\n\nIt accepts the following options:\n" }, { "name": "write_id3v2", "content": "Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).\n" }, { "name": "id3v2_version", "content": "Select ID3v2 version to write. Currently only version 3 and 4 (aka. ID3v2.3 and ID3v2.4)\nare supported. The default is version 4.\n" }, { "name": "alp", "content": "Muxer for audio of High Voltage Software's Lego Racers game. It accepts a single\nADPCMIMAALP stream with no more than 2 channels nor a sample rate greater than 44100 Hz.\n\nExtensions: tun, pcm\n\nOptions\n\nIt accepts the following options:\n\ntype type\nSet file type.\n\ntun Set file type as music. Must have a sample rate of 22050 Hz.\n\npcm Set file type as sfx.\n\nauto\nSet file type as per output file extension. \".pcm\" results in type \"pcm\" else type\n\"tun\" is set. (default)\n" }, { "name": "asf", "content": "Advanced Systems Format muxer.\n\nNote that Windows Media Audio (wma) and Windows Media Video (wmv) use this muxer too.\n\nOptions\n\nIt accepts the following options:\n" }, { "name": "packet_size", "content": "Set the muxer packet size. By tuning this setting you may reduce data fragmentation or\nmuxer overhead depending on your source. Default value is 3200, minimum is 100, maximum\nis 64k.\n" }, { "name": "avi", "content": "Audio Video Interleaved muxer.\n\nOptions\n\nIt accepts the following options:\n" }, { "name": "reserve_index_space", "content": "Reserve the specified amount of bytes for the OpenDML master index of each stream within\nthe file header. By default additional master indexes are embedded within the data\npackets if there is no space left in the first master index and are linked together as a\nchain of indexes. This index structure can cause problems for some use cases, e.g. third-\nparty software strictly relying on the OpenDML index specification or when file seeking\nis slow. Reserving enough index space in the file header avoids these problems.\n\nThe required index space depends on the output file size and should be about 16 bytes per\ngigabyte. When this option is omitted or set to zero the necessary index space is\nguessed.\n" }, { "name": "write_channel_mask", "content": "Write the channel layout mask into the audio stream header.\n\nThis option is enabled by default. Disabling the channel mask can be useful in specific\nscenarios, e.g. when merging multiple audio streams into one for compatibility with\nsoftware that only supports a single audio stream in AVI (see the \"amerge\" section in the\nffmpeg-filters manual).\n" }, { "name": "flipped_raw_rgb", "content": "If set to true, store positive height for raw RGB bitmaps, which indicates bitmap is\nstored bottom-up. Note that this option does not flip the bitmap which has to be done\nmanually beforehand, e.g. by using the vflip filter. Default is false and indicates\nbitmap is stored top down.\n" }, { "name": "chromaprint", "content": "Chromaprint fingerprinter.\n\nThis muxer feeds audio data to the Chromaprint library, which generates a fingerprint for the\nprovided audio data. See \n\nIt takes a single signed native-endian 16-bit raw audio stream of at most 2 channels.\n\nOptions\n" }, { "name": "silence_threshold", "content": "Threshold for detecting silence. Range is from -1 to 32767, where -1 disables silence\ndetection. Silence detection can only be used with version 3 of the algorithm. Silence\ndetection must be disabled for use with the AcoustID service. Default is -1.\n" }, { "name": "algorithm", "content": "Version of algorithm to fingerprint with. Range is 0 to 4. Version 3 enables silence\ndetection. Default is 1.\n" }, { "name": "fp_format", "content": "Format to output the fingerprint as. Accepts the following options:\n\nraw Binary raw fingerprint\n\ncompressed\nBinary compressed fingerprint\n\nbase64\nBase64 compressed fingerprint (default)\n" }, { "name": "crc", "content": "CRC (Cyclic Redundancy Check) testing format.\n\nThis muxer computes and prints the Adler-32 CRC of all the input audio and video frames. By\ndefault audio frames are converted to signed 16-bit raw audio and video frames to raw video\nbefore computing the CRC.\n\nThe output of the muxer consists of a single line of the form: CRC=0xCRC, where CRC is a\nhexadecimal number 0-padded to 8 digits containing the CRC for all the decoded input frames.\n\nSee also the framecrc muxer.\n\nExamples\n\nFor example to compute the CRC of the input, and store it in the file out.crc:\n\nffmpeg -i INPUT -f crc out.crc\n\nYou can print the CRC to stdout with the command:\n\nffmpeg -i INPUT -f crc -\n\nYou can select the output format of each frame with ffmpeg by specifying the audio and video\ncodec and format. For example to compute the CRC of the input audio converted to PCM unsigned\n8-bit and the input video converted to MPEG-2 video, use the command:\n\nffmpeg -i INPUT -c:a pcmu8 -c:v mpeg2video -f crc -\n" }, { "name": "dash", "content": "Dynamic Adaptive Streaming over HTTP (DASH) muxer that creates segments and manifest files\naccording to the MPEG-DASH standard ISO/IEC 23009-1:2014.\n\nFor more information see:\n\n• ISO DASH Specification:\n\n\n• WebM DASH Specification:\n\n\nIt creates a MPD manifest file and segment files for each stream.\n\nThe segment filename might contain pre-defined identifiers used with SegmentTemplate as\ndefined in section 5.3.9.4.4 of the standard. Available identifiers are \"$RepresentationID$\",\n\"$Number$\", \"$Bandwidth$\" and \"$Time$\". In addition to the standard identifiers, an ffmpeg-\nspecific \"$ext$\" identifier is also supported. When specified ffmpeg will replace $ext$ in\nthe file name with muxing format's extensions such as mp4, webm etc.,\n\nffmpeg -re -i -map 0 -map 0 -c:a libfdkaac -c:v libx264 \\\n-b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline \\\n-profile:v:0 main -bf 1 -keyintmin 120 -g 120 -scthreshold 0 \\\n-bstrategy 0 -ar:a:1 22050 -usetimeline 1 -usetemplate 1 \\\n-windowsize 5 -adaptationsets \"id=0,streams=v id=1,streams=a\" \\\n-f dash /path/to/out.mpd\n\nsegduration duration\nSet the segment length in seconds (fractional value can be set). The value is treated as\naverage segment duration when usetemplate is enabled and usetimeline is disabled and as\nminimum segment duration for all the other use cases.\n\nfragduration duration\nSet the length in seconds of fragments within segments (fractional value can be set).\n\nfragtype type\nSet the type of interval for fragmentation.\n\nwindowsize size\nSet the maximum number of segments kept in the manifest.\n\nextrawindowsize size\nSet the maximum number of segments kept outside of the manifest before removing from\ndisk.\n\nremoveatexit remove\nEnable (1) or disable (0) removal of all segments when finished.\n\nusetemplate template\nEnable (1) or disable (0) use of SegmentTemplate instead of SegmentList.\n\nusetimeline timeline\nEnable (1) or disable (0) use of SegmentTimeline in SegmentTemplate.\n\nsinglefile singlefile\nEnable (1) or disable (0) storing all segments in one file, accessed using byte ranges.\n\nsinglefilename filename\nDASH-templated name to be used for baseURL. Implies singlefile set to \"1\". In the\ntemplate, \"$ext$\" is replaced with the file name extension specific for the segment\nformat.\n\ninitsegname initname\nDASH-templated name to used for the initialization segment. Default is\n\"init-stream$RepresentationID$.$ext$\". \"$ext$\" is replaced with the file name extension\nspecific for the segment format.\n\nmediasegname segmentname\nDASH-templated name to used for the media segments. Default is\n\"chunk-stream$RepresentationID$-$Number%05d$.$ext$\". \"$ext$\" is replaced with the file\nname extension specific for the segment format.\n\nutctimingurl utcurl\nURL of the page that will return the UTC timestamp in ISO format. Example:\n\"https://time.akamai.com/?iso\"\n\nmethod method\nUse the given HTTP method to create output files. Generally set to PUT or POST.\n\nhttpuseragent useragent\nOverride User-Agent field in HTTP header. Applicable only for HTTP output.\n\nhttppersistent httppersistent\nUse persistent HTTP connections. Applicable only for HTTP output.\n\nhlsplaylist hlsplaylist\nGenerate HLS playlist files as well. The master playlist is generated with the filename\nhlsmastername. One media playlist file is generated for each stream with filenames\nmedia0.m3u8, media1.m3u8, etc.\n\nhlsmastername filename\nHLS master playlist name. Default is \"master.m3u8\".\n\nstreaming streaming\nEnable (1) or disable (0) chunk streaming mode of output. In chunk streaming mode, each\nframe will be a moof fragment which forms a chunk.\n\nadaptationsets adaptationsets\nAssign streams to AdaptationSets. Syntax is \"id=x,streams=a,b,c id=y,streams=d,e\" with x\nand y being the IDs of the adaptation sets and a,b,c,d and e are the indices of the\nmapped streams.\n\nTo map all video (or audio) streams to an AdaptationSet, \"v\" (or \"a\") can be used as\nstream identifier instead of IDs.\n\nWhen no assignment is defined, this defaults to an AdaptationSet for each stream.\n\nOptional syntax is\n\"id=x,segduration=x,fragduration=x,fragtype=type,descriptor=descriptorstring,streams=a,b,c\nid=y,segduration=y,fragtype=type,streams=d,e\" and so on, descriptor is useful to the\nscheme defined by ISO/IEC 23009-1:2014/Amd.2:2015. For example, -adaptationsets\n\"id=0,descriptor=,streams=v\". Please note that descriptor string should be a\nself-closing xml tag. segduration, fragduration and fragtype override the global\noption values for each adaptation set. For example, -adaptationsets\n\"id=0,segduration=2,fragduration=1,fragtype=duration,streams=v\nid=1,segduration=2,fragtype=none,streams=a\" typeid marks an adaptation set as\ncontaining streams meant to be used for Trick Mode for the referenced adaptation set.\nFor example, -adaptationsets \"id=0,segduration=2,fragtype=none,streams=0\nid=1,segduration=10,fragtype=none,trickid=0,streams=1\"\n\ntimeout timeout\nSet timeout for socket I/O operations. Applicable only for HTTP output.\n\nindexcorrection indexcorrection\nEnable (1) or Disable (0) segment index correction logic. Applicable only when\nusetemplate is enabled and usetimeline is disabled.\n\nWhen enabled, the logic monitors the flow of segment indexes. If a streams's segment\nindex value is not at the expected real time position, then the logic corrects that index\nvalue.\n\nTypically this logic is needed in live streaming use cases. The network bandwidth\nfluctuations are common during long run streaming. Each fluctuation can cause the segment\nindexes fall behind the expected real time position.\n\nformatoptions optionslist\nSet container format (mp4/webm) options using a \":\" separated list of key=value\nparameters. Values containing \":\" special characters must be escaped.\n\nglobalsidx globalsidx\nWrite global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode.\n\ndashsegmenttype dashsegmenttype\nPossible values:\n\nauto\nIf this flag is set, the dash segment files format will be selected based on the\nstream codec. This is the default mode.\n\nmp4 If this flag is set, the dash segment files will be in in ISOBMFF format.\n\nwebm\nIf this flag is set, the dash segment files will be in in WebM format.\n\nignoreioerrors ignoreioerrors\nIgnore IO errors during open and write. Useful for long-duration runs with network\noutput.\n\nlhls lhls\nEnable Low-latency HLS(LHLS). Adds #EXT-X-PREFETCH tag with current segment's URI.\nhls.js player folks are trying to standardize an open LHLS spec. The draft spec is\navailable in\nhttps://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md This option\ntries to comply with the above open spec. It enables streaming and hlsplaylist options\nautomatically. This is an experimental feature.\n\nNote: This is not Apple's version LHLS. See\n\n\nldash ldash\nEnable Low-latency Dash by constraining the presence and values of some elements.\n\nmasterm3u8publishrate masterm3u8publishrate\nPublish master playlist repeatedly every after specified number of segment intervals.\n\nwriteprft writeprft\nWrite Producer Reference Time elements on supported streams. This also enables writing\nprft boxes in the underlying muxer. Applicable only when the utcurl option is enabled.\nIt's set to auto by default, in which case the muxer will attempt to enable it only in\nmodes that require it.\n\nmpdprofile mpdprofile\nSet one or more manifest profiles.\n\nhttpopts httpopts\nA :-separated list of key=value options to pass to the underlying HTTP protocol.\nApplicable only for HTTP output.\n\ntargetlatency targetlatency\nSet an intended target latency in seconds (fractional value can be set) for serving.\nApplicable only when streaming and writeprft options are enabled. This is an\ninformative fields clients can use to measure the latency of the service.\n\nminplaybackrate minplaybackrate\nSet the minimum playback rate indicated as appropriate for the purposes of automatically\nadjusting playback latency and buffer occupancy during normal playback by clients.\n\nmaxplaybackrate maxplaybackrate\nSet the maximum playback rate indicated as appropriate for the purposes of automatically\nadjusting playback latency and buffer occupancy during normal playback by clients.\n\nupdateperiod updateperiod\nSet the mpd update period ,for dynamic content.\nThe unit is second.\n" }, { "name": "fifo", "content": "The fifo pseudo-muxer allows the separation of encoding and muxing by using first-in-first-\nout queue and running the actual muxer in a separate thread. This is especially useful in\ncombination with the tee muxer and can be used to send data to several destinations with\ndifferent reliability/writing speed/latency.\n\nAPI users should be aware that callback functions (interruptcallback, ioopen and ioclose)\nused within its AVFormatContext must be thread-safe.\n\nThe behavior of the fifo muxer if the queue fills up or if the output fails is selectable,\n\n• output can be transparently restarted with configurable delay between retries based on\nreal time or time of the processed stream.\n\n• encoding can be blocked during temporary failure, or continue transparently dropping\npackets in case fifo queue fills up.\n" }, { "name": "fifo_format", "content": "Specify the format name. Useful if it cannot be guessed from the output name suffix.\n" }, { "name": "queue_size", "content": "Specify size of the queue (number of packets). Default value is 60.\n" }, { "name": "format_opts", "content": "Specify format options for the underlying muxer. Muxer options can be specified as a list\nof key=value pairs separated by ':'.\n\ndroppktsonoverflow bool\nIf set to 1 (true), in case the fifo queue fills up, packets will be dropped rather than\nblocking the encoder. This makes it possible to continue streaming without delaying the\ninput, at the cost of omitting part of the stream. By default this option is set to 0\n(false), so in such cases the encoder will be blocked until the muxer processes some of\nthe packets and none of them is lost.\n\nattemptrecovery bool\nIf failure occurs, attempt to recover the output. This is especially useful when used\nwith network output, since it makes it possible to restart streaming transparently. By\ndefault this option is set to 0 (false).\n" }, { "name": "max_recovery_attempts", "content": "Sets maximum number of successive unsuccessful recovery attempts after which the output\nfails permanently. By default this option is set to 0 (unlimited).\n\nrecoverywaittime duration\nWaiting time before the next recovery attempt after previous unsuccessful recovery\nattempt. Default value is 5 seconds.\n\nrecoverywaitstreamtime bool\nIf set to 0 (false), the real time is used when waiting for the recovery attempt (i.e.\nthe recovery will be attempted after at least recoverywaittime seconds). If set to 1\n(true), the time of the processed stream is taken into account instead (i.e. the recovery\nwill be attempted after at least recoverywaittime seconds of the stream is omitted).\nBy default, this option is set to 0 (false).\n\nrecoveranyerror bool\nIf set to 1 (true), recovery will be attempted regardless of type of the error causing\nthe failure. By default this option is set to 0 (false) and in case of certain (usually\npermanent) errors the recovery is not attempted even when attemptrecovery is set to 1.\n\nrestartwithkeyframe bool\nSpecify whether to wait for the keyframe after recovering from queue overflow or failure.\nThis option is set to 0 (false) by default.\n\ntimeshift duration\nBuffer the specified amount of packets and delay writing the output. Note that queuesize\nmust be big enough to store the packets for timeshift. At the end of the input the fifo\nbuffer is flushed at realtime speed.\n\nExamples\n\n• Stream something to rtmp server, continue processing the stream at real-time rate even in\ncase of temporary failure (network outage) and attempt to recover streaming every second\nindefinitely.\n\nffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifoformat flv -map 0:v -map 0:a\n-droppktsonoverflow 1 -attemptrecovery 1 -recoverywaittime 1 rtmp://example.com/live/streamname\n" }, { "name": "flv", "content": "Adobe Flash Video Format muxer.\n\nThis muxer accepts the following options:\n\nflvflags flags\nPossible values:\n\naacseqheaderdetect\nPlace AAC sequence header based on audio stream data.\n\nnosequenceend\nDisable sequence end tag.\n\nnometadata\nDisable metadata tag.\n\nnodurationfilesize\nDisable duration and filesize in metadata when they are equal to zero at the end of\nstream. (Be used to non-seekable living stream).\n\naddkeyframeindex\nUsed to facilitate seeking; particularly for HTTP pseudo streaming.\n" }, { "name": "framecrc", "content": "Per-packet CRC (Cyclic Redundancy Check) testing format.\n\nThis muxer computes and prints the Adler-32 CRC for each audio and video packet. By default\naudio frames are converted to signed 16-bit raw audio and video frames to raw video before\ncomputing the CRC.\n\nThe output of the muxer consists of a line for each audio and video packet of the form:\n\n, , , , , 0x\n\nCRC is a hexadecimal number 0-padded to 8 digits containing the CRC of the packet.\n\nExamples\n\nFor example to compute the CRC of the audio and video frames in INPUT, converted to raw audio\nand video packets, and store it in the file out.crc:\n\nffmpeg -i INPUT -f framecrc out.crc\n\nTo print the information to stdout, use the command:\n\nffmpeg -i INPUT -f framecrc -\n\nWith ffmpeg, you can select the output format to which the audio and video frames are encoded\nbefore computing the CRC for each packet by specifying the audio and video codec. For\nexample, to compute the CRC of each decoded input audio frame converted to PCM unsigned 8-bit\nand of each decoded input video frame converted to MPEG-2 video, use the command:\n\nffmpeg -i INPUT -c:a pcmu8 -c:v mpeg2video -f framecrc -\n\nSee also the crc muxer.\n" }, { "name": "framehash", "content": "Per-packet hash testing format.\n\nThis muxer computes and prints a cryptographic hash for each audio and video packet. This can\nbe used for packet-by-packet equality checks without having to individually do a binary\ncomparison on each.\n\nBy default audio frames are converted to signed 16-bit raw audio and video frames to raw\nvideo before computing the hash, but the output of explicit conversions to other codecs can\nalso be used. It uses the SHA-256 cryptographic hash function by default, but supports\nseveral other algorithms.\n\nThe output of the muxer consists of a line for each audio and video packet of the form:\n\n, , , , , \n\nhash is a hexadecimal number representing the computed hash for the packet.\n\nhash algorithm\nUse the cryptographic hash function specified by the string algorithm. Supported values\ninclude \"MD5\", \"murmur3\", \"RIPEMD128\", \"RIPEMD160\", \"RIPEMD256\", \"RIPEMD320\", \"SHA160\",\n\"SHA224\", \"SHA256\" (default), \"SHA512/224\", \"SHA512/256\", \"SHA384\", \"SHA512\", \"CRC32\" and\n\"adler32\".\n\nExamples\n\nTo compute the SHA-256 hash of the audio and video frames in INPUT, converted to raw audio\nand video packets, and store it in the file out.sha256:\n\nffmpeg -i INPUT -f framehash out.sha256\n\nTo print the information to stdout, using the MD5 hash function, use the command:\n\nffmpeg -i INPUT -f framehash -hash md5 -\n\nSee also the hash muxer.\n" }, { "name": "framemd5", "content": "Per-packet MD5 testing format.\n\nThis is a variant of the framehash muxer. Unlike that muxer, it defaults to using the MD5\nhash function.\n\nExamples\n\nTo compute the MD5 hash of the audio and video frames in INPUT, converted to raw audio and\nvideo packets, and store it in the file out.md5:\n\nffmpeg -i INPUT -f framemd5 out.md5\n\nTo print the information to stdout, use the command:\n\nffmpeg -i INPUT -f framemd5 -\n\nSee also the framehash and md5 muxers.\n" }, { "name": "gif", "content": "Animated GIF muxer.\n\nIt accepts the following options:\n" }, { "name": "loop", "content": "Set the number of times to loop the output. Use -1 for no loop, 0 for looping\nindefinitely (default).\n" }, { "name": "final_delay", "content": "Force the delay (expressed in centiseconds) after the last frame. Each frame ends with a\ndelay until the next frame. The default is -1, which is a special value to tell the muxer\nto re-use the previous delay. In case of a loop, you might want to customize this value\nto mark a pause for instance.\n\nFor example, to encode a gif looping 10 times, with a 5 seconds delay between the loops:\n\nffmpeg -i INPUT -loop 10 -finaldelay 500 out.gif\n\nNote 1: if you wish to extract the frames into separate GIF files, you need to force the\nimage2 muxer:\n\nffmpeg -i INPUT -c:v gif -f image2 \"out%d.gif\"\n\nNote 2: the GIF format has a very large time base: the delay between two frames can therefore\nnot be smaller than one centi second.\n" }, { "name": "hash", "content": "Hash testing format.\n\nThis muxer computes and prints a cryptographic hash of all the input audio and video frames.\nThis can be used for equality checks without having to do a complete binary comparison.\n\nBy default audio frames are converted to signed 16-bit raw audio and video frames to raw\nvideo before computing the hash, but the output of explicit conversions to other codecs can\nalso be used. Timestamps are ignored. It uses the SHA-256 cryptographic hash function by\ndefault, but supports several other algorithms.\n\nThe output of the muxer consists of a single line of the form: algo=hash, where algo is a\nshort string representing the hash function used, and hash is a hexadecimal number\nrepresenting the computed hash.\n\nhash algorithm\nUse the cryptographic hash function specified by the string algorithm. Supported values\ninclude \"MD5\", \"murmur3\", \"RIPEMD128\", \"RIPEMD160\", \"RIPEMD256\", \"RIPEMD320\", \"SHA160\",\n\"SHA224\", \"SHA256\" (default), \"SHA512/224\", \"SHA512/256\", \"SHA384\", \"SHA512\", \"CRC32\" and\n\"adler32\".\n\nExamples\n\nTo compute the SHA-256 hash of the input converted to raw audio and video, and store it in\nthe file out.sha256:\n\nffmpeg -i INPUT -f hash out.sha256\n\nTo print an MD5 hash to stdout use the command:\n\nffmpeg -i INPUT -f hash -hash md5 -\n\nSee also the framehash muxer.\n" }, { "name": "hls", "content": "Apple HTTP Live Streaming muxer that segments MPEG-TS according to the HTTP Live Streaming\n(HLS) specification.\n\nIt creates a playlist file, and one or more segment files. The output filename specifies the\nplaylist filename.\n\nBy default, the muxer creates a file for each segment produced. These files have the same\nname as the playlist, followed by a sequential number and a .ts extension.\n\nMake sure to require a closed GOP when encoding and to set the GOP size to fit your segment\ntime constraint.\n\nFor example, to convert an input file with ffmpeg:\n\nffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hlstime 1 out.m3u8\n\nThis example will produce the playlist, out.m3u8, and segment files: out0.ts, out1.ts,\nout2.ts, etc.\n\nSee also the segment muxer, which provides a more generic and flexible implementation of a\nsegmenter, and can be used to perform HLS segmentation.\n\nOptions\n\nThis muxer supports the following options:\n\nhlsinittime duration\nSet the initial target segment length. Default value is 0.\n\nduration must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual.\n\nSegment will be cut on the next key frame after this time has passed on the first m3u8\nlist. After the initial playlist is filled ffmpeg will cut segments at duration equal to\n\"hlstime\"\n\nhlstime duration\nSet the target segment length. Default value is 2.\n\nduration must be a time duration specification, see the Time duration section in the\nffmpeg-utils(1) manual. Segment will be cut on the next key frame after this time has\npassed.\n\nhlslistsize size\nSet the maximum number of playlist entries. If set to 0 the list file will contain all\nthe segments. Default value is 5.\n\nhlsdeletethreshold size\nSet the number of unreferenced segments to keep on disk before \"hlsflags\ndeletesegments\" deletes them. Increase this to allow continue clients to download\nsegments which were recently referenced in the playlist. Default value is 1, meaning\nsegments older than \"hlslistsize+1\" will be deleted.\n" }, { "name": "hls_start_number_source", "content": "Start the playlist sequence number (\"#EXT-X-MEDIA-SEQUENCE\") according to the specified\nsource. Unless \"hlsflags singlefile\" is set, it also specifies source of starting\nsequence numbers of segment and subtitle filenames. In any case, if \"hlsflags\nappendlist\" is set and read playlist sequence number is greater than the specified start\nsequence number, then that value will be used as start value.\n\nIt accepts the following values:\n\ngeneric (default)\nSet the starting sequence numbers according to startnumber option value.\n\nepoch\nThe start number will be the seconds since epoch (1970-01-01 00:00:00)\n\nepochus\nThe start number will be the microseconds since epoch (1970-01-01 00:00:00)\n\ndatetime\nThe start number will be based on the current date/time as YYYYmmddHHMMSS. e.g.\n20161231235759.\n\nstartnumber number\nStart the playlist sequence number (\"#EXT-X-MEDIA-SEQUENCE\") from the specified number\nwhen hlsstartnumbersource value is generic. (This is the default case.) Unless\n\"hlsflags singlefile\" is set, it also specifies starting sequence numbers of segment\nand subtitle filenames. Default value is 0.\n\nhlsallowcache allowcache\nExplicitly set whether the client MAY (1) or MUST NOT (0) cache media segments.\n\nhlsbaseurl baseurl\nAppend baseurl to every entry in the playlist. Useful to generate playlists with\nabsolute paths.\n\nNote that the playlist sequence number must be unique for each segment and it is not to\nbe confused with the segment filename sequence number which can be cyclic, for example if\nthe wrap option is specified.\n\nhlssegmentfilename filename\nSet the segment filename. Unless \"hlsflags singlefile\" is set, filename is used as a\nstring format with the segment number:\n\nffmpeg -i in.nut -hlssegmentfilename 'file%03d.ts' out.m3u8\n\nThis example will produce the playlist, out.m3u8, and segment files: file000.ts,\nfile001.ts, file002.ts, etc.\n\nfilename may contain full path or relative path specification, but only the file name\npart without any path info will be contained in the m3u8 segment list. Should a relative\npath be specified, the path of the created segment files will be relative to the current\nworking directory. When strftimemkdir is set, the whole expanded value of filename will\nbe written into the m3u8 segment list.\n\nWhen \"varstreammap\" is set with two or more variant streams, the filename pattern must\ncontain the string \"%v\", this string specifies the position of variant stream index in\nthe generated segment file names.\n\nffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls -varstreammap \"v:0,a:0 v:1,a:1\" \\\n-hlssegmentfilename 'file%v%03d.ts' out%v.m3u8\n\nThis example will produce the playlists segment file sets: file0000.ts, file0001.ts,\nfile0002.ts, etc. and file1000.ts, file1001.ts, file1002.ts, etc.\n\nThe string \"%v\" may be present in the filename or in the last directory name containing\nthe file, but only in one of them. (Additionally, %v may appear multiple times in the\nlast sub-directory or filename.) If the string %v is present in the directory name, then\nsub-directories are created after expanding the directory name pattern. This enables\ncreation of segments corresponding to different variant streams in subdirectories.\n\nffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls -varstreammap \"v:0,a:0 v:1,a:1\" \\\n-hlssegmentfilename 'vs%v/file%03d.ts' vs%v/out.m3u8\n\nThis example will produce the playlists segment file sets: vs0/file000.ts,\nvs0/file001.ts, vs0/file002.ts, etc. and vs1/file000.ts, vs1/file001.ts,\nvs1/file002.ts, etc.\n" }, { "name": "strftime", "content": "Use strftime() on filename to expand the segment filename with localtime. The segment\nnumber is also available in this mode, but to use it, you need to specify\nsecondlevelsegmentindex hlsflag and %%d will be the specifier.\n\nffmpeg -i in.nut -strftime 1 -hlssegmentfilename 'file-%Y%m%d-%s.ts' out.m3u8\n\nThis example will produce the playlist, out.m3u8, and segment files:\nfile-20160215-1455569023.ts, file-20160215-1455569024.ts, etc. Note: On some\nsystems/environments, the %s specifier is not available. See\nstrftime() documentation.\n\nffmpeg -i in.nut -strftime 1 -hlsflags secondlevelsegmentindex -hlssegmentfilename 'file-%Y%m%d-%%04d.ts' out.m3u8\n\nThis example will produce the playlist, out.m3u8, and segment files:\nfile-20160215-0001.ts, file-20160215-0002.ts, etc.\n" }, { "name": "strftime_mkdir", "content": "Used together with -strftimemkdir, it will create all subdirectories which is expanded\nin filename.\n\nffmpeg -i in.nut -strftime 1 -strftimemkdir 1 -hlssegmentfilename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8\n\nThis example will create a directory 201560215 (if it does not exist), and then produce\nthe playlist, out.m3u8, and segment files: 20160215/file-20160215-1455569023.ts,\n20160215/file-20160215-1455569024.ts, etc.\n\nffmpeg -i in.nut -strftime 1 -strftimemkdir 1 -hlssegmentfilename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8\n\nThis example will create a directory hierarchy 2016/02/15 (if any of them do not exist),\nand then produce the playlist, out.m3u8, and segment files:\n2016/02/15/file-20160215-1455569023.ts, 2016/02/15/file-20160215-1455569024.ts, etc.\n\nhlssegmentoptions optionslist\nSet output format options using a :-separated list of key=value parameters. Values\ncontaining \":\" special characters must be escaped.\n\nhlskeyinfofile keyinfofile\nUse the information in keyinfofile for segment encryption. The first line of\nkeyinfofile specifies the key URI written to the playlist. The key URL is used to\naccess the encryption key during playback. The second line specifies the path to the key\nfile used to obtain the key during the encryption process. The key file is read as a\nsingle packed array of 16 octets in binary format. The optional third line specifies the\ninitialization vector (IV) as a hexadecimal string to be used instead of the segment\nsequence number (default) for encryption. Changes to keyinfofile will result in segment\nencryption with the new key/IV and an entry in the playlist for the new key URI/IV if\n\"hlsflags periodicrekey\" is enabled.\n\nKey info file format:\n\n\n\n (optional)\n\nExample key URIs:\n\nhttp://server/file.key\n/path/to/file.key\nfile.key\n\nExample key file paths:\n\nfile.key\n/path/to/file.key\n\nExample IV:\n\n0123456789ABCDEF0123456789ABCDEF\n\nKey info file example:\n\nhttp://server/file.key\n/path/to/file.key\n0123456789ABCDEF0123456789ABCDEF\n\nExample shell script:\n\n#!/bin/sh\nBASEURL=${1:-'.'}\nopenssl rand 16 > file.key\necho $BASEURL/file.key > file.keyinfo\necho file.key >> file.keyinfo\necho $(openssl rand -hex 16) >> file.keyinfo\nffmpeg -f lavfi -re -i testsrc -c:v h264 -hlsflags deletesegments \\\n-hlskeyinfofile file.keyinfo out.m3u8\n" }, { "name": "-hls_enc _", "content": "Enable (1) or disable (0) the AES128 encryption. When enabled every segment generated is\nencrypted and the encryption key is saved as playlist name.key.\n" }, { "name": "-hls_enc_key _", "content": "16-octet key to encrypt the segments, by default it is randomly generated.\n" }, { "name": "-hls_enc_key_url _", "content": "If set, keyurl is prepended instead of baseurl to the key filename in the playlist.\n" }, { "name": "-hls_enc_iv _", "content": "16-octet initialization vector for every segment instead of the autogenerated ones.\n\nhlssegmenttype flags\nPossible values:\n\nmpegts\nOutput segment files in MPEG-2 Transport Stream format. This is compatible with all\nHLS versions.\n\nfmp4\nOutput segment files in fragmented MP4 format, similar to MPEG-DASH. fmp4 files may\nbe used in HLS version 7 and above.\n\nhlsfmp4initfilename filename\nSet filename to the fragment files header file, default filename is init.mp4.\n\nUse \"-strftime 1\" on filename to expand the segment filename with localtime.\n\nffmpeg -i in.nut -hlssegmenttype fmp4 -strftime 1 -hlsfmp4initfilename \"%sinit.mp4\" out.m3u8\n\nThis will produce init like this 1602678741init.mp4\n" }, { "name": "hls_fmp4_init_resend", "content": "Resend init file after m3u8 file refresh every time, default is 0.\n\nWhen \"varstreammap\" is set with two or more variant streams, the filename pattern must\ncontain the string \"%v\", this string specifies the position of variant stream index in\nthe generated init file names. The string \"%v\" may be present in the filename or in the\nlast directory name containing the file. If the string is present in the directory name,\nthen sub-directories are created after expanding the directory name pattern. This enables\ncreation of init files corresponding to different variant streams in subdirectories.\n\nhlsflags flags\nPossible values:\n\nsinglefile\nIf this flag is set, the muxer will store all segments in a single MPEG-TS file, and\nwill use byte ranges in the playlist. HLS playlists generated with this way will have\nthe version number 4. For example:\n\nffmpeg -i in.nut -hlsflags singlefile out.m3u8\n\nWill produce the playlist, out.m3u8, and a single segment file, out.ts.\n\ndeletesegments\nSegment files removed from the playlist are deleted after a period of time equal to\nthe duration of the segment plus the duration of the playlist.\n\nappendlist\nAppend new segments into the end of old segment list, and remove the \"#EXT-X-ENDLIST\"\nfrom the old segment list.\n\nrounddurations\nRound the duration info in the playlist file segment info to integer values, instead\nof using floating point. If there are no other features requiring higher HLS\nversions be used, then this will allow ffmpeg to output a HLS version 2 m3u8.\n\ndiscontstart\nAdd the \"#EXT-X-DISCONTINUITY\" tag to the playlist, before the first segment's\ninformation.\n\nomitendlist\nDo not append the \"EXT-X-ENDLIST\" tag at the end of the playlist.\n\nperiodicrekey\nThe file specified by \"hlskeyinfofile\" will be checked periodically and detect\nupdates to the encryption info. Be sure to replace this file atomically, including\nthe file containing the AES encryption key.\n\nindependentsegments\nAdd the \"#EXT-X-INDEPENDENT-SEGMENTS\" to playlists that has video segments and when\nall the segments of that playlist are guaranteed to start with a Key frame.\n\niframesonly\nAdd the \"#EXT-X-I-FRAMES-ONLY\" to playlists that has video segments and can play only\nI-frames in the \"#EXT-X-BYTERANGE\" mode.\n\nsplitbytime\nAllow segments to start on frames other than keyframes. This improves behavior on\nsome players when the time between keyframes is inconsistent, but may make things\nworse on others, and can cause some oddities during seeking. This flag should be used\nwith the \"hlstime\" option.\n\nprogramdatetime\nGenerate \"EXT-X-PROGRAM-DATE-TIME\" tags.\n\nsecondlevelsegmentindex\nMakes it possible to use segment indexes as %%d in hlssegmentfilename expression\nbesides date/time values when strftime is on. To get fixed width numbers with\ntrailing zeroes, %%0xd format is available where x is the required width.\n\nsecondlevelsegmentsize\nMakes it possible to use segment sizes (counted in bytes) as %%s in\nhlssegmentfilename expression besides date/time values when strftime is on. To get\nfixed width numbers with trailing zeroes, %%0xs format is available where x is the\nrequired width.\n\nsecondlevelsegmentduration\nMakes it possible to use segment duration (calculated in microseconds) as %%t in\nhlssegmentfilename expression besides date/time values when strftime is on. To get\nfixed width numbers with trailing zeroes, %%0xt format is available where x is the\nrequired width.\n\nffmpeg -i sample.mpeg \\\n-f hls -hlstime 3 -hlslistsize 5 \\\n-hlsflags secondlevelsegmentindex+secondlevelsegmentsize+secondlevelsegmentduration \\\n-strftime 1 -strftimemkdir 1 -hlssegmentfilename \"segment%Y%m%d%H%M%S%%04d%%08s%%013t.ts\" stream.m3u8\n\nThis will produce segments like this:\nsegment201701021943340003001222000000003000000.ts,\nsegment201701021943340004001200720000003000000.ts etc.\n\ntempfile\nWrite segment data to filename.tmp and rename to filename only once the segment is\ncomplete. A webserver serving up segments can be configured to reject requests to\n*.tmp to prevent access to in-progress segments before they have been added to the\nm3u8 playlist. This flag also affects how m3u8 playlist files are created. If this\nflag is set, all playlist files will written into temporary file and renamed after\nthey are complete, similarly as segments are handled. But playlists with \"file\"\nprotocol and with type (\"hlsplaylisttype\") other than \"vod\" are always written into\ntemporary file regardless of this flag. Master playlist files (\"masterplname\"), if\nany, with \"file\" protocol, are always written into temporary file regardless of this\nflag if \"masterplpublishrate\" value is other than zero.\n" }, { "name": "hls_playlist_type event", "content": "Emit \"#EXT-X-PLAYLIST-TYPE:EVENT\" in the m3u8 header. Forces hlslistsize to 0; the\nplaylist can only be appended to.\n" }, { "name": "hls_playlist_type vod", "content": "Emit \"#EXT-X-PLAYLIST-TYPE:VOD\" in the m3u8 header. Forces hlslistsize to 0; the\nplaylist must not change.\n" }, { "name": "method", "content": "Use the given HTTP method to create the hls files.\n\nffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8\n\nThis example will upload all the mpegts segment files to the HTTP server using the HTTP\nPUT method, and update the m3u8 files every \"refresh\" times using the same method. Note\nthat the HTTP server must support the given method for uploading files.\n" }, { "name": "http_user_agent", "content": "Override User-Agent field in HTTP header. Applicable only for HTTP output.\n" }, { "name": "var_stream_map", "content": "Map string which specifies how to group the audio, video and subtitle streams into\ndifferent variant streams. The variant stream groups are separated by space. Expected\nstring format is like this \"a:0,v:0 a:1,v:1 ....\". Here a:, v:, s: are the keys to\nspecify audio, video and subtitle streams respectively. Allowed values are 0 to 9\n(limited just based on practical usage).\n\nWhen there are two or more variant streams, the output filename pattern must contain the\nstring \"%v\", this string specifies the position of variant stream index in the output\nmedia playlist filenames. The string \"%v\" may be present in the filename or in the last\ndirectory name containing the file. If the string is present in the directory name, then\nsub-directories are created after expanding the directory name pattern. This enables\ncreation of variant streams in subdirectories.\n\nffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls -varstreammap \"v:0,a:0 v:1,a:1\" \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates two hls variant streams. The first variant stream will contain video\nstream of bitrate 1000k and audio stream of bitrate 64k and the second variant stream\nwill contain video stream of bitrate 256k and audio stream of bitrate 32k. Here, two\nmedia playlist with file names out0.m3u8 and out1.m3u8 will be created. If you want\nsomething meaningful text instead of indexes in result names, you may specify names for\neach or some of the variants as in the following example.\n\nffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls -varstreammap \"v:0,a:0,name:myhd v:1,a:1,name:mysd\" \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates two hls variant streams as in the previous one. But here, the two\nmedia playlist with file names outmyhd.m3u8 and outmysd.m3u8 will be created.\n\nffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \\\n-map 0:v -map 0:a -map 0:v -f hls -varstreammap \"v:0 a:0 v:1\" \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates three hls variant streams. The first variant stream will be a video\nonly stream with video bitrate 1000k, the second variant stream will be an audio only\nstream with bitrate 64k and the third variant stream will be a video only stream with\nbitrate 256k. Here, three media playlist with file names out0.m3u8, out1.m3u8 and\nout2.m3u8 will be created.\n\nffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls -varstreammap \"v:0,a:0 v:1,a:1\" \\\nhttp://example.com/live/vs%v/out.m3u8\n\nThis example creates the variant streams in subdirectories. Here, the first media\nplaylist is created at http://example.com/live/vs0/out.m3u8 and the second one at\nhttp://example.com/live/vs1/out.m3u8.\n\nffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k \\\n-map 0:a -map 0:a -map 0:v -map 0:v -f hls \\\n-varstreammap \"a:0,agroup:audlow a:1,agroup:audhigh v:0,agroup:audlow v:1,agroup:audhigh\" \\\n-masterplname master.m3u8 \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates two audio only and two video only variant streams. In addition to\nthe #EXT-X-STREAM-INF tag for each variant stream in the master playlist, #EXT-X-MEDIA\ntag is also added for the two audio only variant streams and they are mapped to the two\nvideo only variant streams with audio group names 'audlow' and 'audhigh'.\n\nBy default, a single hls variant containing all the encoded streams is created.\n\nffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \\\n-map 0:a -map 0:a -map 0:v -f hls \\\n-varstreammap \"a:0,agroup:audlow,default:yes a:1,agroup:audlow v:0,agroup:audlow\" \\\n-masterplname master.m3u8 \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates two audio only and one video only variant streams. In addition to\nthe #EXT-X-STREAM-INF tag for each variant stream in the master playlist, #EXT-X-MEDIA\ntag is also added for the two audio only variant streams and they are mapped to the one\nvideo only variant streams with audio group name 'audlow', and the audio group have\ndefault stat is NO or YES.\n\nBy default, a single hls variant containing all the encoded streams is created.\n\nffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \\\n-map 0:a -map 0:a -map 0:v -f hls \\\n-varstreammap \"a:0,agroup:audlow,default:yes,language:ENG a:1,agroup:audlow,language:CHN v:0,agroup:audlow\" \\\n-masterplname master.m3u8 \\\nhttp://example.com/live/out%v.m3u8\n\nThis example creates two audio only and one video only variant streams. In addition to\nthe #EXT-X-STREAM-INF tag for each variant stream in the master playlist, #EXT-X-MEDIA\ntag is also added for the two audio only variant streams and they are mapped to the one\nvideo only variant streams with audio group name 'audlow', and the audio group have\ndefault stat is NO or YES, and one audio have and language is named ENG, the other audio\nlanguage is named CHN.\n\nBy default, a single hls variant containing all the encoded streams is created.\n\nffmpeg -y -i inputwithsubtitle.mkv \\\n-b:v:0 5250k -c:v h264 -pixfmt yuv420p -profile:v main -level 4.1 \\\n-b:a:0 256k \\\n-c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \\\n-f hls -varstreammap \"v:0,a:0,s:0,sgroup:subtitle\" \\\n-masterplname master.m3u8 -t 300 -hlstime 10 -hlsinittime 4 -hlslistsize \\\n10 -masterplpublishrate 10 -hlsflags \\\ndeletesegments+discontstart+splitbytime ./tmp/video.m3u8\n\nThis example adds \"#EXT-X-MEDIA\" tag with \"TYPE=SUBTITLES\" in the master playlist with\nwebvtt subtitle group name 'subtitle'. Please make sure the input file has one text\nsubtitle stream at least.\n" }, { "name": "cc_stream_map", "content": "Map string which specifies different closed captions groups and their attributes. The\nclosed captions stream groups are separated by space. Expected string format is like\nthis \"ccgroup:,instreamid:,language: ....\".\n'ccgroup' and 'instreamid' are mandatory attributes. 'language' is an optional attribute.\nThe closed captions groups configured using this option are mapped to different variant\nstreams by providing the same 'ccgroup' name in the \"varstreammap\" string. If\n\"varstreammap\" is not set, then the first available ccgroup in \"ccstreammap\" is\nmapped to the output variant stream. The examples for these two use cases are given\nbelow.\n\nffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \\\n-ccstreammap \"ccgroup:cc,instreamid:CC1,language:en\" \\\n-masterplname master.m3u8 \\\nhttp://example.com/live/out.m3u8\n\nThis example adds \"#EXT-X-MEDIA\" tag with \"TYPE=CLOSED-CAPTIONS\" in the master playlist\nwith group name 'cc', language 'en' (english) and INSTREAM-ID 'CC1'. Also, it adds\n\"CLOSED-CAPTIONS\" attribute with group name 'cc' for the output variant stream.\n\nffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \\\n-a53cc:0 1 -a53cc:1 1\\\n-map 0:v -map 0:a -map 0:v -map 0:a -f hls \\\n-ccstreammap \"ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp\" \\\n-varstreammap \"v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc\" \\\n-masterplname master.m3u8 \\\nhttp://example.com/live/out%v.m3u8\n\nThis example adds two \"#EXT-X-MEDIA\" tags with \"TYPE=CLOSED-CAPTIONS\" in the master\nplaylist for the INSTREAM-IDs 'CC1' and 'CC2'. Also, it adds \"CLOSED-CAPTIONS\" attribute\nwith group name 'cc' for the two output variant streams.\n" }, { "name": "master_pl_name", "content": "Create HLS master playlist with the given name.\n\nffmpeg -re -i in.ts -f hls -masterplname master.m3u8 http://example.com/live/out.m3u8\n\nThis example creates HLS master playlist with name master.m3u8 and it is published at\nhttp://example.com/live/\n" }, { "name": "master_pl_publish_rate", "content": "Publish master play list repeatedly every after specified number of segment intervals.\n\nffmpeg -re -i in.ts -f hls -masterplname master.m3u8 \\\n-hlstime 2 -masterplpublishrate 30 http://example.com/live/out.m3u8\n\nThis example creates HLS master playlist with name master.m3u8 and keep publishing it\nrepeatedly every after 30 segments i.e. every after 60s.\n" }, { "name": "http_persistent", "content": "Use persistent HTTP connections. Applicable only for HTTP output.\n" }, { "name": "timeout", "content": "Set timeout for socket I/O operations. Applicable only for HTTP output.\n" }, { "name": "ignore_io_errors", "content": "Ignore IO errors during open, write and delete. Useful for long-duration runs with\nnetwork output.\n" }, { "name": "headers", "content": "Set custom HTTP headers, can override built in default headers. Applicable only for HTTP\noutput.\n" }, { "name": "ico", "content": "ICO file muxer.\n\nMicrosoft's icon file format (ICO) has some strict limitations that should be noted:\n\n• Size cannot exceed 256 pixels in any dimension\n\n• Only BMP and PNG images can be stored\n\n• If a BMP image is used, it must be one of the following pixel formats:\n\nBMP Bit Depth FFmpeg Pixel Format\n1bit pal8\n4bit pal8\n8bit pal8\n16bit rgb555le\n24bit bgr24\n32bit bgra\n\n• If a BMP image is used, it must use the BITMAPINFOHEADER DIB header\n\n• If a PNG image is used, it must use the rgba pixel format\n" }, { "name": "image2", "content": "Image file muxer.\n\nThe image file muxer writes video frames to image files.\n\nThe output filenames are specified by a pattern, which can be used to produce sequentially\nnumbered series of files. The pattern may contain the string \"%d\" or \"%0Nd\", this string\nspecifies the position of the characters representing a numbering in the filenames. If the\nform \"%0Nd\" is used, the string representing the number in each filename is 0-padded to N\ndigits. The literal character '%' can be specified in the pattern with the string \"%%\".\n\nIf the pattern contains \"%d\" or \"%0Nd\", the first filename of the file list specified will\ncontain the number 1, all the following numbers will be sequential.\n\nThe pattern may contain a suffix which is used to automatically determine the format of the\nimage files to write.\n\nFor example the pattern \"img-%03d.bmp\" will specify a sequence of filenames of the form\nimg-001.bmp, img-002.bmp, ..., img-010.bmp, etc. The pattern \"img%%-%d.jpg\" will specify a\nsequence of filenames of the form img%-1.jpg, img%-2.jpg, ..., img%-10.jpg, etc.\n\nThe image muxer supports the .Y.U.V image file format. This format is special in that that\neach image frame consists of three files, for each of the YUV420P components. To read or\nwrite this image file format, specify the name of the '.Y' file. The muxer will automatically\nopen the '.U' and '.V' files as required.\n\nOptions\n" }, { "name": "frame_pts", "content": "If set to 1, expand the filename with pts from pkt->pts. Default value is 0.\n" }, { "name": "start_number", "content": "Start the sequence from the specified number. Default value is 1.\n" }, { "name": "update", "content": "If set to 1, the filename will always be interpreted as just a filename, not a pattern,\nand the corresponding file will be continuously overwritten with new images. Default\nvalue is 0.\n" }, { "name": "strftime", "content": "If set to 1, expand the filename with date and time information from strftime(). Default\nvalue is 0.\n" }, { "name": "atomic_writing", "content": "Write output to a temporary file, which is renamed to target filename once writing is\ncompleted. Default is disabled.\n\nprotocolopts optionslist\nSet protocol options as a :-separated list of key=value parameters. Values containing the\n\":\" special character must be escaped.\n\nExamples\n\nThe following example shows how to use ffmpeg for creating a sequence of files img-001.jpeg,\nimg-002.jpeg, ..., taking one image every second from the input video:\n\nffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'\n\nNote that with ffmpeg, if the format is not specified with the \"-f\" option and the output\nfilename specifies an image file format, the image2 muxer is automatically selected, so the\nprevious command can be written as:\n\nffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'\n\nNote also that the pattern must not necessarily contain \"%d\" or \"%0Nd\", for example to create\na single image file img.jpeg from the start of the input video you can employ the command:\n\nffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg\n\nThe strftime option allows you to expand the filename with date and time information. Check\nthe documentation of the strftime() function for the syntax.\n\nFor example to generate image files from the strftime() \"%Y-%m-%d%H-%M-%S\" pattern, the\nfollowing ffmpeg command can be used:\n\nffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 \"%Y-%m-%d%H-%M-%S.jpg\"\n\nYou can set the file name with current frame's PTS:\n\nffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -framepts true %d.jpg\n\nA more complex example is to publish contents of your desktop directly to a WebDAV server\nevery second:\n\nffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocolopts method=PUT http://example.com/desktop.jpg\n" }, { "name": "matroska", "content": "Matroska container muxer.\n\nThis muxer implements the matroska and webm container specs.\n\nMetadata\n\nThe recognized metadata settings in this muxer are:\n" }, { "name": "title", "content": "Set title name provided to a single track. This gets mapped to the FileDescription\nelement for a stream written as attachment.\n" }, { "name": "language", "content": "Specify the language of the track in the Matroska languages form.\n\nThe language can be either the 3 letters bibliographic ISO-639-2 (ISO 639-2/B) form (like\n\"fre\" for French), or a language code mixed with a country code for specialities in\nlanguages (like \"fre-ca\" for Canadian French).\n" }, { "name": "stereo_mode", "content": "Set stereo 3D video layout of two views in a single video track.\n\nThe following values are recognized:\n\nmono\nvideo is not stereo\n\nleftright\nBoth views are arranged side by side, Left-eye view is on the left\n\nbottomtop\nBoth views are arranged in top-bottom orientation, Left-eye view is at bottom\n\ntopbottom\nBoth views are arranged in top-bottom orientation, Left-eye view is on top\n\ncheckerboardrl\nEach view is arranged in a checkerboard interleaved pattern, Left-eye view being\nfirst\n\ncheckerboardlr\nEach view is arranged in a checkerboard interleaved pattern, Right-eye view being\nfirst\n\nrowinterleavedrl\nEach view is constituted by a row based interleaving, Right-eye view is first row\n\nrowinterleavedlr\nEach view is constituted by a row based interleaving, Left-eye view is first row\n\ncolinterleavedrl\nBoth views are arranged in a column based interleaving manner, Right-eye view is\nfirst column\n\ncolinterleavedlr\nBoth views are arranged in a column based interleaving manner, Left-eye view is first\ncolumn\n\nanaglyphcyanred\nAll frames are in anaglyph format viewable through red-cyan filters\n\nrightleft\nBoth views are arranged side by side, Right-eye view is on the left\n\nanaglyphgreenmagenta\nAll frames are in anaglyph format viewable through green-magenta filters\n\nblocklr\nBoth eyes laced in one Block, Left-eye view is first\n\nblockrl\nBoth eyes laced in one Block, Right-eye view is first\n\nFor example a 3D WebM clip can be created using the following command line:\n\nffmpeg -i sampleleftrightclip.mpg -an -c:v libvpx -metadata stereomode=leftright -y stereoclip.webm\n\nOptions\n\nThis muxer supports the following options:\n" }, { "name": "reserve_index_space", "content": "By default, this muxer writes the index for seeking (called cues in Matroska terms) at\nthe end of the file, because it cannot know in advance how much space to leave for the\nindex at the beginning of the file. However for some use cases -- e.g. streaming where\nseeking is possible but slow -- it is useful to put the index at the beginning of the\nfile.\n\nIf this option is set to a non-zero value, the muxer will reserve a given amount of space\nin the file header and then try to write the cues there when the muxing finishes. If the\nreserved space does not suffice, no Cues will be written, the file will be finalized and\nwriting the trailer will return an error. A safe size for most use cases should be about\n50kB per hour of video.\n\nNote that cues are only written if the output is seekable and this option will have no\neffect if it is not.\n" }, { "name": "cues_to_front", "content": "If set, the muxer will write the index at the beginning of the file by shifting the main\ndata if necessary. This can be combined with reserveindexspace in which case the data\nis only shifted if the initially reserved space turns out to be insufficient.\n\nThis option is ignored if the output is unseekable.\n" }, { "name": "default_mode", "content": "This option controls how the FlagDefault of the output tracks will be set. It influences\nwhich tracks players should play by default. The default mode is passthrough.\n\ninfer\nEvery track with disposition default will have the FlagDefault set. Additionally,\nfor each type of track (audio, video or subtitle), if no track with disposition\ndefault of this type exists, then the first track of this type will be marked as\ndefault (if existing). This ensures that the default flag is set in a sensible way\neven if the input originated from containers that lack the concept of default tracks.\n\ninfernosubs\nThis mode is the same as infer except that if no subtitle track with disposition\ndefault exists, no subtitle track will be marked as default.\n\npassthrough\nIn this mode the FlagDefault is set if and only if the AVDISPOSITIONDEFAULT flag is\nset in the disposition of the corresponding stream.\n" }, { "name": "flipped_raw_rgb", "content": "If set to true, store positive height for raw RGB bitmaps, which indicates bitmap is\nstored bottom-up. Note that this option does not flip the bitmap which has to be done\nmanually beforehand, e.g. by using the vflip filter. Default is false and indicates\nbitmap is stored top down.\n" }, { "name": "md5", "content": "MD5 testing format.\n\nThis is a variant of the hash muxer. Unlike that muxer, it defaults to using the MD5 hash\nfunction.\n\nExamples\n\nTo compute the MD5 hash of the input converted to raw audio and video, and store it in the\nfile out.md5:\n\nffmpeg -i INPUT -f md5 out.md5\n\nYou can print the MD5 to stdout with the command:\n\nffmpeg -i INPUT -f md5 -\n\nSee also the hash and framemd5 muxers.\n" }, { "name": "mov, mp4, ismv", "content": "MOV/MP4/ISMV (Smooth Streaming) muxer.\n\nThe mov/mp4/ismv muxer supports fragmentation. Normally, a MOV/MP4 file has all the metadata\nabout all packets stored in one location (written at the end of the file, it can be moved to\nthe start for better playback by adding \"+faststart\" to the \"-movflags\", or using the qt-\nfaststart tool).\n\nA fragmented file consists of a number of fragments, where packets and metadata about these\npackets are stored together. Writing a fragmented file has the advantage that the file is\ndecodable even if the writing is interrupted (while a normal MOV/MP4 is undecodable if it is\nnot properly finished), and it requires less memory when writing very long files (since\nwriting normal MOV/MP4 files stores info about every single packet in memory until the file\nis closed). The downside is that it is less compatible with other applications.\n\nFragmentation is enabled by setting one of the options that define how to cut the file into\nfragments: \"-fragduration\", \"-fragsize\", \"-minfragduration\", \"-movflags +fragkeyframe\"\nand \"-movflags +fragcustom\". If more than one condition is specified, fragments are cut when\none of the specified conditions is fulfilled. The exception to this is \"-minfragduration\",\nwhich has to be fulfilled for any of the other conditions to apply.\n\nOptions\n\nfragduration duration\nCreate fragments that are duration microseconds long.\n\nfragsize size\nCreate fragments that contain up to size bytes of payload data.\n\nminfragduration duration\nDon't create fragments that are shorter than duration microseconds long.\n\nmovflags flags\nSet various muxing switches. The following flags can be used:\n\nfragkeyframe\nStart a new fragment at each video keyframe.\n\nfragcustom\nAllow the caller to manually choose when to cut fragments, by calling\n\"avwriteframe(ctx, NULL)\" to write a fragment with the packets written so far.\n(This is only useful with other applications integrating libavformat, not from\nffmpeg.)\n\nemptymoov\nWrite an initial moov atom directly at the start of the file, without describing any\nsamples in it. Generally, an mdat/moov pair is written at the start of the file, as a\nnormal MOV/MP4 file, containing only a short portion of the file. With this option\nset, there is no initial mdat atom, and the moov atom only describes the tracks but\nhas a zero duration.\n\nThis option is implicitly set when writing ismv (Smooth Streaming) files.\n\nseparatemoof\nWrite a separate moof (movie fragment) atom for each track. Normally, packets for all\ntracks are written in a moof atom (which is slightly more efficient), but with this\noption set, the muxer writes one moof/mdat pair for each track, making it easier to\nseparate tracks.\n\nThis option is implicitly set when writing ismv (Smooth Streaming) files.\n\nskipsidx\nSkip writing of sidx atom. When bitrate overhead due to sidx atom is high, this\noption could be used for cases where sidx atom is not mandatory. When globalsidx\nflag is enabled, this option will be ignored.\n\nfaststart\nRun a second pass moving the index (moov atom) to the beginning of the file. This\noperation can take a while, and will not work in various situations such as\nfragmented output, thus it is not enabled by default.\n\nrtphint\nAdd RTP hinting tracks to the output file.\n\ndisablechpl\nDisable Nero chapter markers (chpl atom). Normally, both Nero chapters and a\nQuickTime chapter track are written to the file. With this option set, only the\nQuickTime chapter track will be written. Nero chapters can cause failures when the\nfile is reprocessed with certain tagging programs, like mp3Tag 2.61a and iTunes 11.3,\nmost likely other versions are affected as well.\n\nomittfhdoffset\nDo not write any absolute basedataoffset in tfhd atoms. This avoids tying fragments\nto absolute byte positions in the file/streams.\n\ndefaultbasemoof\nSimilarly to the omittfhdoffset, this flag avoids writing the absolute\nbasedataoffset field in tfhd atoms, but does so by using the new default-base-is-\nmoof flag instead. This flag is new from 14496-12:2012. This may make the fragments\neasier to parse in certain circumstances (avoiding basing track fragment location\ncalculations on the implicit end of the previous track fragment).\n\nnegativectsoffsets\nEnables utilization of version 1 of the CTTS box, in which the CTS offsets can be\nnegative. This enables the initial sample to have DTS/CTS of zero, and reduces the\nneed for edit lists for some cases such as video tracks with B-frames. Additionally,\neases conformance with the DASH-IF interoperability guidelines.\n\nThis option is implicitly set when writing ismv (Smooth Streaming) files.\n\nmoovsize bytes\nReserves space for the moov atom at the beginning of the file instead of placing the moov\natom at the end. If the space reserved is insufficient, muxing will fail.\n" }, { "name": "write_tmcd", "content": "Specify \"on\" to force writing a timecode track, \"off\" to disable it and \"auto\" to write a\ntimecode track only for mov and mp4 output (default).\n\nwritebtrt bool\nForce or disable writing bitrate box inside stsd box of a track. The box contains\ndecoding buffer size (in bytes), maximum bitrate and average bitrate for the track. The\nbox will be skipped if none of these values can be computed. Default is -1 or \"auto\",\nwhich will write the box only in MP4 mode.\n" }, { "name": "write_prft", "content": "Write producer time reference box (PRFT) with a specified time source for the NTP field\nin the PRFT box. Set value as wallclock to specify timesource as wallclock time and pts\nto specify timesource as input packets' PTS values.\n\nSetting value to pts is applicable only for a live encoding use case, where PTS values\nare set as as wallclock time at the source. For example, an encoding use case with\ndecklink capture source where videopts and audiopts are set to abswallclock.\n\nemptyhdlrname bool\nEnable to skip writing the name inside a \"hdlr\" box. Default is \"false\".\n\nmovietimescale scale\nSet the timescale written in the movie header box (\"mvhd\"). Range is 1 to INTMAX.\nDefault is 1000.\n\nvideotracktimescale scale\nSet the timescale used for video tracks. Range is 0 to INTMAX. If set to 0, the\ntimescale is automatically set based on the native stream time base. Default is 0.\n\nExample\n\nSmooth Streaming content can be pushed in real time to a publishing point on IIS with this\nmuxer. Example:\n\nffmpeg -re <> -movflags isml+fragkeyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)\n" }, { "name": "mp3", "content": "The MP3 muxer writes a raw MP3 stream with the following optional features:\n\n• An ID3v2 metadata header at the beginning (enabled by default). Versions 2.3 and 2.4 are\nsupported, the \"id3v2version\" private option controls which one is used (3 or 4).\nSetting \"id3v2version\" to 0 disables the ID3v2 header completely.\n\nThe muxer supports writing attached pictures (APIC frames) to the ID3v2 header. The\npictures are supplied to the muxer in form of a video stream with a single packet. There\ncan be any number of those streams, each will correspond to a single APIC frame. The\nstream metadata tags title and comment map to APIC description and picture type\nrespectively. See for allowed picture types.\n\nNote that the APIC frames must be written at the beginning, so the muxer will buffer the\naudio frames until it gets all the pictures. It is therefore advised to provide the\npictures as soon as possible to avoid excessive buffering.\n\n• A Xing/LAME frame right after the ID3v2 header (if present). It is enabled by default,\nbut will be written only if the output is seekable. The \"writexing\" private option can\nbe used to disable it. The frame contains various information that may be useful to the\ndecoder, like the audio duration or encoder delay.\n\n• A legacy ID3v1 tag at the end of the file (disabled by default). It may be enabled with\nthe \"writeid3v1\" private option, but as its capabilities are very limited, its usage is\nnot recommended.\n\nExamples:\n\nWrite an mp3 with an ID3v2.3 header and an ID3v1 footer:\n\nffmpeg -i INPUT -id3v2version 3 -writeid3v1 1 out.mp3\n\nTo attach a picture to an mp3 file select both the audio and the picture stream with \"map\":\n\nffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1\n-metadata:s:v title=\"Album cover\" -metadata:s:v comment=\"Cover (Front)\" out.mp3\n\nWrite a \"clean\" MP3 without any extra features:\n\nffmpeg -i input.wav -writexing 0 -id3v2version 0 out.mp3\n" }, { "name": "mpegts", "content": "MPEG transport stream muxer.\n\nThis muxer implements ISO 13818-1 and part of ETSI EN 300 468.\n\nThe recognized metadata settings in mpegts muxer are \"serviceprovider\" and \"servicename\".\nIf they are not set the default for \"serviceprovider\" is FFmpeg and the default for\n\"servicename\" is Service01.\n\nOptions\n\nThe muxer options are:\n\nmpegtstransportstreamid integer\nSet the transportstreamid. This identifies a transponder in DVB. Default is 0x0001.\n\nmpegtsoriginalnetworkid integer\nSet the originalnetworkid. This is unique identifier of a network in DVB. Its main use\nis in the unique identification of a service through the path OriginalNetworkID,\nTransportStreamID. Default is 0x0001.\n\nmpegtsserviceid integer\nSet the serviceid, also known as program in DVB. Default is 0x0001.\n\nmpegtsservicetype integer\nSet the program servicetype. Default is \"digitaltv\". Accepts the following options:\n\nhexvalue\nAny hexadecimal value between 0x01 and 0xff as defined in ETSI 300 468.\n\ndigitaltv\nDigital TV service.\n\ndigitalradio\nDigital Radio service.\n\nteletext\nTeletext service.\n\nadvancedcodecdigitalradio\nAdvanced Codec Digital Radio service.\n\nmpeg2digitalhdtv\nMPEG2 Digital HDTV service.\n\nadvancedcodecdigitalsdtv\nAdvanced Codec Digital SDTV service.\n\nadvancedcodecdigitalhdtv\nAdvanced Codec Digital HDTV service.\n\nmpegtspmtstartpid integer\nSet the first PID for PMTs. Default is 0x1000, minimum is 0x0020, maximum is 0x1ffa. This\noption has no effect in m2ts mode where the PMT PID is fixed 0x0100.\n\nmpegtsstartpid integer\nSet the first PID for elementary streams. Default is 0x0100, minimum is 0x0020, maximum\nis 0x1ffa. This option has no effect in m2ts mode where the elementary stream PIDs are\nfixed.\n\nmpegtsm2tsmode boolean\nEnable m2ts mode if set to 1. Default value is -1 which disables m2ts mode.\n\nmuxrate integer\nSet a constant muxrate. Default is VBR.\n\npespayloadsize integer\nSet minimum PES packet payload in bytes. Default is 2930.\n\nmpegtsflags flags\nSet mpegts flags. Accepts the following options:\n\nresendheaders\nReemit PAT/PMT before writing the next packet.\n\nlatm\nUse LATM packetization for AAC.\n\npatpmtatframes\nReemit PAT and PMT at each video frame.\n\nsystemb\nConform to System B (DVB) instead of System A (ATSC).\n\ninitialdiscontinuity\nMark the initial packet of each stream as discontinuity.\n\nnit Emit NIT table.\n\nomitrai\nDisable writing of random access indicator.\n\nmpegtscopyts boolean\nPreserve original timestamps, if value is set to 1. Default value is -1, which results in\nshifting timestamps so that they start from 0.\n\nomitvideopeslength boolean\nOmit the PES packet length for video packets. Default is 1 (true).\n\npcrperiod integer\nOverride the default PCR retransmission time in milliseconds. Default is -1 which means\nthat the PCR interval will be determined automatically: 20 ms is used for CBR streams,\nthe highest multiple of the frame duration which is less than 100 ms is used for VBR\nstreams.\n\npatperiod duration\nMaximum time in seconds between PAT/PMT tables. Default is 0.1.\n\nsdtperiod duration\nMaximum time in seconds between SDT tables. Default is 0.5.\n\nnitperiod duration\nMaximum time in seconds between NIT tables. Default is 0.5.\n\ntablesversion integer\nSet PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31,\ninclusively). This option allows updating stream structure so that standard consumer may\ndetect the change. To do so, reopen output \"AVFormatContext\" (in case of API usage) or\nrestart ffmpeg instance, cyclically changing tablesversion value:\n\nffmpeg -i source1.ts -codec copy -f mpegts -tablesversion 0 udp://1.1.1.1:1111\nffmpeg -i source2.ts -codec copy -f mpegts -tablesversion 1 udp://1.1.1.1:1111\n...\nffmpeg -i source3.ts -codec copy -f mpegts -tablesversion 31 udp://1.1.1.1:1111\nffmpeg -i source1.ts -codec copy -f mpegts -tablesversion 0 udp://1.1.1.1:1111\nffmpeg -i source2.ts -codec copy -f mpegts -tablesversion 1 udp://1.1.1.1:1111\n...\n\nExample\n\nffmpeg -i file.mpg -c copy \\\n-mpegtsoriginalnetworkid 0x1122 \\\n-mpegtstransportstreamid 0x3344 \\\n-mpegtsserviceid 0x5566 \\\n-mpegtspmtstartpid 0x1500 \\\n-mpegtsstartpid 0x150 \\\n-metadata serviceprovider=\"Some provider\" \\\n-metadata servicename=\"Some Channel\" \\\nout.ts\n" }, { "name": "mxf, mxf_d10, mxf_opatom", "content": "MXF muxer.\n\nOptions\n\nThe muxer options are:\n\nstoreusercomments bool\nSet if user comments should be stored if available or never. IRT D-10 does not allow\nuser comments. The default is thus to write them for mxf and mxfopatom but not for\nmxfd10\n" }, { "name": "null", "content": "Null muxer.\n\nThis muxer does not generate any output file, it is mainly useful for testing or benchmarking\npurposes.\n\nFor example to benchmark decoding with ffmpeg you can use the command:\n\nffmpeg -benchmark -i INPUT -f null out.null\n\nNote that the above command does not read or write the out.null file, but specifying the\noutput file is required by the ffmpeg syntax.\n\nAlternatively you can write the command as:\n\nffmpeg -benchmark -i INPUT -f null -\n" }, { "name": "nut", "content": "" }, { "name": "-syncpoints _", "content": "Change the syncpoint usage in nut:\n\ndefault use the normal low-overhead seeking aids.\nnone do not use the syncpoints at all, reducing the overhead but making the stream non-\nseekable;\nUse of this option is not recommended, as the resulting files are very damage\nsensitive and seeking is not possible. Also in general the overhead from\nsyncpoints is negligible. Note, -C 0 can be used to disable\nall growing data tables, allowing to mux endless streams with limited memory\nand without these disadvantages.\n\ntimestamped extend the syncpoint with a wallclock field.\n\nThe none and timestamped flags are experimental.\n" }, { "name": "-write_index _", "content": "Write index at the end, the default is to write an index.\n\nffmpeg -i INPUT -fstrict experimental -syncpoints none - | processor\n" }, { "name": "ogg", "content": "Ogg container muxer.\n" }, { "name": "-page_duration _", "content": "Preferred page duration, in microseconds. The muxer will attempt to create pages that are\napproximately duration microseconds long. This allows the user to compromise between seek\ngranularity and container overhead. The default is 1 second. A value of 0 will fill all\nsegments, making pages as large as possible. A value of 1 will effectively use 1 packet-\nper-page in most situations, giving a small seek granularity at the cost of additional\ncontainer overhead.\n" }, { "name": "-serial_offset _", "content": "Serial value from which to set the streams serial number. Setting it to different and\nsufficiently large values ensures that the produced ogg files can be safely chained.\n" }, { "name": "raw muxers", "content": "Raw muxers accept a single stream matching the designated codec. They do not store timestamps\nor metadata. The recognized extension is the same as the muxer name unless indicated\notherwise.\n\nac3\n\nDolby Digital, also known as AC-3, audio.\n\nadx\n\nCRI Middleware ADX audio.\n\nThis muxer will write out the total sample count near the start of the first packet when the\noutput is seekable and the count can be stored in 32 bits.\n\naptx\n\naptX (Audio Processing Technology for Bluetooth) audio.\n\naptxhd\n\naptX HD (Audio Processing Technology for Bluetooth) audio.\n\nExtensions: aptxhd\n\navs2\n\nAVS2-P2/IEEE1857.4 video.\n\nExtensions: avs, avs2\n\ncavsvideo\n\nChinese AVS (Audio Video Standard) video.\n\nExtensions: cavs\n\ncodec2raw\n\nCodec 2 audio.\n\nNo extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool\n\"-f codec2raw\".\n\ndata\n\nData muxer accepts a single stream with any codec of any type. The input stream has to be\nselected using the \"-map\" option with the ffmpeg CLI tool.\n\nNo extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool\n\"-f data\".\n\ndirac\n\nBBC Dirac video. The Dirac Pro codec is a subset and is standardized as SMPTE VC-2.\n\nExtensions: drc, vc2\n\ndnxhd\n\nAvid DNxHD video. It is standardized as SMPTE VC-3. Accepts DNxHR streams.\n\nExtensions: dnxhd, dnxhr\n\ndts\n\nDTS Coherent Acoustics (DCA) audio.\n\neac3\n\nDolby Digital Plus, also known as Enhanced AC-3, audio.\n\nevc\n\nMPEG-5 Essential Video Coding (EVC) / EVC / MPEG-5 Part 1 EVC video.\n\nExtensions: evc\n\ng722\n\nITU-T G.722 audio.\n\ng7231\n\nITU-T G.723.1 audio.\n\nExtensions: tco, rco\n\ng726\n\nITU-T G.726 big-endian (\"left-justified\") audio.\n\nNo extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool\n\"-f g726\".\n\ng726le\n\nITU-T G.726 little-endian (\"right-justified\") audio.\n\nNo extension is registered so format name has to be supplied e.g. with the ffmpeg CLI tool\n\"-f g726le\".\n\ngsm\n\nGlobal System for Mobile Communications audio.\n\nh261\n\nITU-T H.261 video.\n\nh263\n\nITU-T H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2 video.\n\nh264\n\nITU-T H.264 / MPEG-4 Part 10 AVC video. Bitstream shall be converted to Annex B syntax if\nit's in length-prefixed mode.\n\nExtensions: h264, 264\n\nhevc\n\nITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be converted to Annex B syntax if\nit's in length-prefixed mode.\n\nExtensions: hevc, h265, 265\n\nm4v\n\nMPEG-4 Part 2 video.\n\nmjpeg\n\nMotion JPEG video.\n\nExtensions: mjpg, mjpeg\n\nmlp\n\nMeridian Lossless Packing, also known as Packed PCM, audio.\n\nmp2\n\nMPEG-1 Audio Layer II audio.\n\nExtensions: mp2, m2a, mpa\n\nmpeg1video\n\nMPEG-1 Part 2 video.\n\nExtensions: mpg, mpeg, m1v\n\nmpeg2video\n\nITU-T H.262 / MPEG-2 Part 2 video.\n\nExtensions: m2v\n\nobu\n\nAV1 low overhead Open Bitstream Units muxer. Temporal delimiter OBUs will be inserted in all\ntemporal units of the stream.\n\nrawvideo\n\nRaw uncompressed video.\n\nExtensions: yuv, rgb\n\nsbc\n\nBluetooth SIG low-complexity subband codec audio.\n\nExtensions: sbc, msbc\n\ntruehd\n\nDolby TrueHD audio.\n\nExtensions: thd\n\nvc1\n\nSMPTE 421M / VC-1 video.\n" }, { "name": "segment, stream_segment, ssegment", "content": "Basic stream segmenter.\n\nThis muxer outputs streams to a number of separate files of nearly fixed duration. Output\nfilename pattern can be set in a fashion similar to image2, or by using a \"strftime\" template\nif the strftime option is enabled.\n\n\"streamsegment\" is a variant of the muxer used to write to streaming output formats, i.e.\nwhich do not require global headers, and is recommended for outputting e.g. to MPEG transport\nstream segments. \"ssegment\" is a shorter alias for \"streamsegment\".\n\nEvery segment starts with a keyframe of the selected reference stream, which is set through\nthe referencestream option.\n\nNote that if you want accurate splitting for a video file, you need to make the input key\nframes correspond to the exact splitting times expected by the segmenter, or the segment\nmuxer will start the new segment with the key frame found next after the specified start\ntime.\n\nThe segment muxer works best with a single constant frame rate video.\n\nOptionally it can generate a list of the created segments, by setting the option\nsegmentlist. The list type is specified by the segmentlisttype option. The entry filenames\nin the segment list are set by default to the basename of the corresponding segment files.\n\nSee also the hls muxer, which provides a more specific implementation for HLS segmentation.\n\nOptions\n\nThe segment muxer supports the following options:\n\nincrementtc 1|0\nif set to 1, increment timecode between each segment If this is selected, the input need\nto have a timecode in the first video stream. Default value is 0.\n\nreferencestream specifier\nSet the reference stream, as specified by the string specifier. If specifier is set to\n\"auto\", the reference is chosen automatically. Otherwise it must be a stream specifier\n(see the ``Stream specifiers'' chapter in the ffmpeg manual) which specifies the\nreference stream. The default value is \"auto\".\n\nsegmentformat format\nOverride the inner container format, by default it is guessed by the filename extension.\n\nsegmentformatoptions optionslist\nSet output format options using a :-separated list of key=value parameters. Values\ncontaining the \":\" special character must be escaped.\n\nsegmentlist name\nGenerate also a listfile named name. If not specified no listfile is generated.\n\nsegmentlistflags flags\nSet flags affecting the segment list generation.\n\nIt currently supports the following flags:\n\ncache\nAllow caching (only affects M3U8 list files).\n\nlive\nAllow live-friendly file generation.\n\nsegmentlistsize size\nUpdate the list file so that it contains at most size segments. If 0 the list file will\ncontain all the segments. Default value is 0.\n\nsegmentlistentryprefix prefix\nPrepend prefix to each entry. Useful to generate absolute paths. By default no prefix is\napplied.\n\nsegmentlisttype type\nSelect the listing format.\n\nThe following values are recognized:\n\nflat\nGenerate a flat list for the created segments, one segment per line.\n\ncsv, ext\nGenerate a list for the created segments, one segment per line, each line matching\nthe format (comma-separated values):\n\n,,\n\nsegmentfilename is the name of the output file generated by the muxer according to\nthe provided pattern. CSV escaping (according to RFC4180) is applied if required.\n\nsegmentstarttime and segmentendtime specify the segment start and end time\nexpressed in seconds.\n\nA list file with the suffix \".csv\" or \".ext\" will auto-select this format.\n\next is deprecated in favor or csv.\n\nffconcat\nGenerate an ffconcat file for the created segments. The resulting file can be read\nusing the FFmpeg concat demuxer.\n\nA list file with the suffix \".ffcat\" or \".ffconcat\" will auto-select this format.\n\nm3u8\nGenerate an extended M3U8 file, version 3, compliant with\n.\n\nA list file with the suffix \".m3u8\" will auto-select this format.\n\nIf not specified the type is guessed from the list file name suffix.\n\nsegmenttime time\nSet segment duration to time, the value must be a duration specification. Default value\nis \"2\". See also the segmenttimes option.\n\nNote that splitting may not be accurate, unless you force the reference stream key-frames\nat the given time. See the introductory notice and the examples below.\n\nminsegduration time\nSet minimum segment duration to time, the value must be a duration specification. This\nprevents the muxer ending segments at a duration below this value. Only effective with\n\"segmenttime\". Default value is \"0\".\n\nsegmentatclocktime 1|0\nIf set to \"1\" split at regular clock time intervals starting from 00:00 o'clock. The time\nvalue specified in segmenttime is used for setting the length of the splitting interval.\n\nFor example with segmenttime set to \"900\" this makes it possible to create files at\n12:00 o'clock, 12:15, 12:30, etc.\n\nDefault value is \"0\".\n\nsegmentclocktimeoffset duration\nDelay the segment splitting times with the specified duration when using\nsegmentatclocktime.\n\nFor example with segmenttime set to \"900\" and segmentclocktimeoffset set to \"300\" this\nmakes it possible to create files at 12:05, 12:20, 12:35, etc.\n\nDefault value is \"0\".\n\nsegmentclocktimewrapduration duration\nForce the segmenter to only start a new segment if a packet reaches the muxer within the\nspecified duration after the segmenting clock time. This way you can make the segmenter\nmore resilient to backward local time jumps, such as leap seconds or transition to\nstandard time from daylight savings time.\n\nDefault is the maximum possible duration which means starting a new segment regardless of\nthe elapsed time since the last clock time.\n\nsegmenttimedelta delta\nSpecify the accuracy time when selecting the start time for a segment, expressed as a\nduration specification. Default value is \"0\".\n\nWhen delta is specified a key-frame will start a new segment if its PTS satisfies the\nrelation:\n\nPTS >= starttime - timedelta\n\nThis option is useful when splitting video content, which is always split at GOP\nboundaries, in case a key frame is found just before the specified split time.\n\nIn particular may be used in combination with the ffmpeg option forcekeyframes. The key\nframe times specified by forcekeyframes may not be set accurately because of rounding\nissues, with the consequence that a key frame time may result set just before the\nspecified time. For constant frame rate videos a value of 1/(2*framerate) should address\nthe worst case mismatch between the specified time and the time set by forcekeyframes.\n\nsegmenttimes times\nSpecify a list of split points. times contains a list of comma separated duration\nspecifications, in increasing order. See also the segmenttime option.\n\nsegmentframes frames\nSpecify a list of split video frame numbers. frames contains a list of comma separated\ninteger numbers, in increasing order.\n\nThis option specifies to start a new segment whenever a reference stream key frame is\nfound and the sequential number (starting from 0) of the frame is greater or equal to the\nnext value in the list.\n\nsegmentwrap limit\nWrap around segment index once it reaches limit.\n\nsegmentstartnumber number\nSet the sequence number of the first segment. Defaults to 0.\n\nstrftime 1|0\nUse the \"strftime\" function to define the name of the new segments to write. If this is\nselected, the output segment name must contain a \"strftime\" function template. Default\nvalue is 0.\n\nbreaknonkeyframes 1|0\nIf enabled, allow segments to start on frames other than keyframes. This improves\nbehavior on some players when the time between keyframes is inconsistent, but may make\nthings worse on others, and can cause some oddities during seeking. Defaults to 0.\n\nresettimestamps 1|0\nReset timestamps at the beginning of each segment, so that each segment will start with\nnear-zero timestamps. It is meant to ease the playback of the generated segments. May not\nwork with some combinations of muxers/codecs. It is set to 0 by default.\n\ninitialoffset offset\nSpecify timestamp offset to apply to the output packet timestamps. The argument must be a\ntime duration specification, and defaults to 0.\n\nwriteemptysegments 1|0\nIf enabled, write an empty segment if there are no packets during the period a segment\nwould usually span. Otherwise, the segment will be filled with the next packet written.\nDefaults to 0.\n\nMake sure to require a closed GOP when encoding and to set the GOP size to fit your segment\ntime constraint.\n\nExamples\n\n• Remux the content of file in.mkv to a list of segments out-000.nut, out-001.nut, etc.,\nand write the list of generated segments to out.list:\n\nffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segmentlist out.list out%03d.nut\n\n• Segment input and set output format options for the output segments:\n\nffmpeg -i in.mkv -f segment -segmenttime 10 -segmentformatoptions movflags=+faststart out%03d.mp4\n\n• Segment the input file according to the split points specified by the segmenttimes\noption:\n\nffmpeg -i in.mkv -codec copy -map 0 -f segment -segmentlist out.csv -segmenttimes 1,2,3,5,8,13,21 out%03d.nut\n\n• Use the ffmpeg forcekeyframes option to force key frames in the input at the specified\nlocation, together with the segment option segmenttimedelta to account for possible\nroundings operated when setting key frame times.\n\nffmpeg -i in.mkv -forcekeyframes 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcms16le -map 0 \\\n-f segment -segmentlist out.csv -segmenttimes 1,2,3,5,8,13,21 -segmenttimedelta 0.05 out%03d.nut\n\nIn order to force key frames on the input file, transcoding is required.\n\n• Segment the input file by splitting the input file according to the frame numbers\nsequence specified with the segmentframes option:\n\nffmpeg -i in.mkv -codec copy -map 0 -f segment -segmentlist out.csv -segmentframes 100,200,300,500,800 out%03d.nut\n\n• Convert the in.mkv to TS segments using the \"libx264\" and \"aac\" encoders:\n\nffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segmentlist out.list out%03d.ts\n\n• Segment the input file, and create an M3U8 live playlist (can be used as live HLS\nsource):\n\nffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segmentlist playlist.m3u8 \\\n-segmentlistflags +live -segmenttime 10 out%03d.mkv\n" }, { "name": "smoothstreaming", "content": "Smooth Streaming muxer generates a set of files (Manifest, chunks) suitable for serving with\nconventional web server.\n" }, { "name": "window_size", "content": "Specify the number of fragments kept in the manifest. Default 0 (keep all).\n" }, { "name": "extra_window_size", "content": "Specify the number of fragments kept outside of the manifest before removing from disk.\nDefault 5.\n" }, { "name": "lookahead_count", "content": "Specify the number of lookahead fragments. Default 2.\n" }, { "name": "min_frag_duration", "content": "Specify the minimum fragment duration (in microseconds). Default 5000000.\n" }, { "name": "remove_at_exit", "content": "Specify whether to remove all fragments when finished. Default 0 (do not remove).\n" }, { "name": "streamhash", "content": "Per stream hash testing format.\n\nThis muxer computes and prints a cryptographic hash of all the input frames, on a per-stream\nbasis. This can be used for equality checks without having to do a complete binary\ncomparison.\n\nBy default audio frames are converted to signed 16-bit raw audio and video frames to raw\nvideo before computing the hash, but the output of explicit conversions to other codecs can\nalso be used. Timestamps are ignored. It uses the SHA-256 cryptographic hash function by\ndefault, but supports several other algorithms.\n\nThe output of the muxer consists of one line per stream of the form:\nstreamindex,streamtype,algo=hash, where streamindex is the index of the mapped stream,\nstreamtype is a single character indicating the type of stream, algo is a short string\nrepresenting the hash function used, and hash is a hexadecimal number representing the\ncomputed hash.\n\nhash algorithm\nUse the cryptographic hash function specified by the string algorithm. Supported values\ninclude \"MD5\", \"murmur3\", \"RIPEMD128\", \"RIPEMD160\", \"RIPEMD256\", \"RIPEMD320\", \"SHA160\",\n\"SHA224\", \"SHA256\" (default), \"SHA512/224\", \"SHA512/256\", \"SHA384\", \"SHA512\", \"CRC32\" and\n\"adler32\".\n\nExamples\n\nTo compute the SHA-256 hash of the input converted to raw audio and video, and store it in\nthe file out.sha256:\n\nffmpeg -i INPUT -f streamhash out.sha256\n\nTo print an MD5 hash to stdout use the command:\n\nffmpeg -i INPUT -f streamhash -hash md5 -\n\nSee also the hash and framehash muxers.\n" }, { "name": "tee", "content": "The tee muxer can be used to write the same data to several outputs, such as files or\nstreams. It can be used, for example, to stream a video over a network and save it to disk\nat the same time.\n\nIt is different from specifying several outputs to the ffmpeg command-line tool. With the tee\nmuxer, the audio and video data will be encoded only once. With conventional multiple\noutputs, multiple encoding operations in parallel are initiated, which can be a very\nexpensive process. The tee muxer is not useful when using the libavformat API directly\nbecause it is then possible to feed the same packets to several muxers directly.\n\nSince the tee muxer does not represent any particular output format, ffmpeg cannot auto-\nselect output streams. So all streams intended for output must be specified using \"-map\". See\nthe examples below.\n\nSome encoders may need different options depending on the output format; the auto-detection\nof this can not work with the tee muxer, so they need to be explicitly specified. The main\nexample is the globalheader flag.\n\nThe slave outputs are specified in the file name given to the muxer, separated by '|'. If any\nof the slave name contains the '|' separator, leading or trailing spaces or any special\ncharacter, those must be escaped (see the \"Quoting and escaping\" section in the\nffmpeg-utils(1) manual).\n\nOptions\n\nusefifo bool\nIf set to 1, slave outputs will be processed in separate threads using the fifo muxer.\nThis allows to compensate for different speed/latency/reliability of outputs and setup\ntransparent recovery. By default this feature is turned off.\n" }, { "name": "fifo_options", "content": "Options to pass to fifo pseudo-muxer instances. See fifo.\n\nMuxer options can be specified for each slave by prepending them as a list of key=value pairs\nseparated by ':', between square brackets. If the options values contain a special character\nor the ':' separator, they must be escaped; note that this is a second level escaping.\n\nThe following special options are also recognized:\n\nf Specify the format name. Required if it cannot be guessed from the output URL.\n\nbsfs[/spec]\nSpecify a list of bitstream filters to apply to the specified output.\n\nIt is possible to specify to which streams a given bitstream filter applies, by appending\na stream specifier to the option separated by \"/\". spec must be a stream specifier (see\nFormat stream specifiers).\n\nIf the stream specifier is not specified, the bitstream filters will be applied to all\nstreams in the output. This will cause that output operation to fail if the output\ncontains streams to which the bitstream filter cannot be applied e.g. \"h264mp4toannexb\"\nbeing applied to an output containing an audio stream.\n\nOptions for a bitstream filter must be specified in the form of \"opt=value\".\n\nSeveral bitstream filters can be specified, separated by \",\".\n\nusefifo bool\nThis allows to override tee muxer usefifo option for individual slave muxer.\n" }, { "name": "fifo_options", "content": "This allows to override tee muxer fifooptions for individual slave muxer. See fifo.\n" }, { "name": "select", "content": "Select the streams that should be mapped to the slave output, specified by a stream\nspecifier. If not specified, this defaults to all the mapped streams. This will cause\nthat output operation to fail if the output format does not accept all mapped streams.\n\nYou may use multiple stream specifiers separated by commas (\",\") e.g.: \"a:0,v\"\n" }, { "name": "onfail", "content": "Specify behaviour on output failure. This can be set to either \"abort\" (which is default)\nor \"ignore\". \"abort\" will cause whole process to fail in case of failure on this slave\noutput. \"ignore\" will ignore failure on this output, so other outputs will continue\nwithout being affected.\n\nExamples\n\n• Encode something and both archive it in a WebM file and stream it as MPEG-TS over UDP:\n\nffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a\n\"archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/\"\n\n• As above, but continue streaming even if output to local file fails (for example local\ndrive fills up):\n\nffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a\n\"[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/\"\n\n• Use ffmpeg to encode the input, and send the output to three different destinations. The\n\"dumpextra\" bitstream filter is used to add extradata information to all the output\nvideo keyframes packets, as requested by the MPEG-TS format. The select option is applied\nto out.aac in order to make it contain only audio packets.\n\nffmpeg -i ... -map 0 -flags +globalheader -c:v libx264 -c:a aac\n-f tee \"[bsfs/v=dumpextra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac\"\n\n• As above, but select only stream \"a:1\" for the audio output. Note that a second level\nescaping must be performed, as \":\" is a special character used to separate options.\n\nffmpeg -i ... -map 0 -flags +globalheader -c:v libx264 -c:a aac\n-f tee \"[bsfs/v=dumpextra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\\'a:1\\']out.aac\"\n" }, { "name": "webm_chunk", "content": "WebM Live Chunk Muxer.\n\nThis muxer writes out WebM headers and chunks as separate files which can be consumed by\nclients that support WebM Live streams via DASH.\n\nOptions\n\nThis muxer supports the following options:\n" }, { "name": "chunk_start_index", "content": "Index of the first chunk (defaults to 0).\n" }, { "name": "header", "content": "Filename of the header where the initialization data will be written.\n" }, { "name": "audio_chunk_duration", "content": "Duration of each audio chunk in milliseconds (defaults to 5000).\n\nExample\n\nffmpeg -f v4l2 -i /dev/video0 \\\n-f alsa -i hw:0 \\\n-map 0:0 \\\n-c:v libvpx-vp9 \\\n-s 640x360 -keyintmin 30 -g 30 \\\n-f webmchunk \\\n-header webmlivevideo360.hdr \\\n-chunkstartindex 1 \\\nwebmlivevideo360%d.chk \\\n-map 1:0 \\\n-c:a libvorbis \\\n-b:a 128k \\\n-f webmchunk \\\n-header webmliveaudio128.hdr \\\n-chunkstartindex 1 \\\n-audiochunkduration 1000 \\\nwebmliveaudio128%d.chk\n" }, { "name": "webm_dash_manifest", "content": "WebM DASH Manifest muxer.\n\nThis muxer implements the WebM DASH Manifest specification to generate the DASH manifest XML.\nIt also supports manifest generation for DASH live streams.\n\nFor more information see:\n\n• WebM DASH Specification:\n\n\n• ISO DASH Specification:\n\n\nOptions\n\nThis muxer supports the following options:\n" }, { "name": "adaptation_sets", "content": "This option has the following syntax: \"id=x,streams=a,b,c id=y,streams=d,e\" where x and y\nare the unique identifiers of the adaptation sets and a,b,c,d and e are the indices of\nthe corresponding audio and video streams. Any number of adaptation sets can be added\nusing this option.\n" }, { "name": "live", "content": "Set this to 1 to create a live stream DASH Manifest. Default: 0.\n" }, { "name": "chunk_start_index", "content": "Start index of the first chunk. This will go in the startNumber attribute of the\nSegmentTemplate element in the manifest. Default: 0.\n" }, { "name": "chunk_duration_ms", "content": "Duration of each chunk in milliseconds. This will go in the duration attribute of the\nSegmentTemplate element in the manifest. Default: 1000.\n" }, { "name": "utc_timing_url", "content": "URL of the page that will return the UTC timestamp in ISO format. This will go in the\nvalue attribute of the UTCTiming element in the manifest. Default: None.\n" }, { "name": "time_shift_buffer_depth", "content": "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to\nbe available. This will go in the timeShiftBufferDepth attribute of the MPD element.\nDefault: 60.\n" }, { "name": "minimum_update_period", "content": "Minimum update period (in seconds) of the manifest. This will go in the\nminimumUpdatePeriod attribute of the MPD element. Default: 0.\n\nExample\n\nffmpeg -f webmdashmanifest -i video1.webm \\\n-f webmdashmanifest -i video2.webm \\\n-f webmdashmanifest -i audio1.webm \\\n-f webmdashmanifest -i audio2.webm \\\n-map 0 -map 1 -map 2 -map 3 \\\n-c copy \\\n-f webmdashmanifest \\\n-adaptationsets \"id=0,streams=0,1 id=1,streams=2,3\" \\\nmanifest.xml\n" } ] }, "METADATA": { "content": "FFmpeg is able to dump metadata from media files into a simple UTF-8-encoded INI-like text\nfile and then load it back using the metadata muxer/demuxer.\n\nThe file format is as follows:\n\n1. A file consists of a header and a number of metadata tags divided into sections, each on\nits own line.\n\n2. The header is a ;FFMETADATA string, followed by a version number (now 1).\n\n3. Metadata tags are of the form key=value\n\n4. Immediately after header follows global metadata\n\n5. After global metadata there may be sections with per-stream/per-chapter metadata.\n\n6. A section starts with the section name in uppercase (i.e. STREAM or CHAPTER) in brackets\n([, ]) and ends with next section or end of file.\n\n7. At the beginning of a chapter section there may be an optional timebase to be used for\nstart/end values. It must be in form TIMEBASE=num/den, where num and den are integers. If\nthe timebase is missing then start/end times are assumed to be in nanoseconds.\n\nNext a chapter section must contain chapter start and end times in form START=num,\nEND=num, where num is a positive integer.\n\n8. Empty lines and lines starting with ; or # are ignored.\n\n9. Metadata keys or values containing special characters (=, ;, #, \\ and a newline) must be\nescaped with a backslash \\.\n\n10. Note that whitespace in metadata (e.g. foo = bar) is considered to be a part of the tag\n(in the example above key is foo , value is\nbar).\n\nA ffmetadata file might look like this:\n\n;FFMETADATA1\ntitle=bike\\\\shed\n;this is a comment\nartist=FFmpeg troll team\n\n[CHAPTER]\nTIMEBASE=1/1000\nSTART=0\n#chapter ends at 0:01:00\nEND=60000\ntitle=chapter \\#1\n[STREAM]\ntitle=multi\\\nline\n\nBy using the ffmetadata muxer and demuxer it is possible to extract metadata from an input\nfile to an ffmetadata file, and then transcode the file into an output file with the edited\nffmetadata file.\n\nExtracting an ffmetadata file with ffmpeg goes as follows:\n\nffmpeg -i INPUT -f ffmetadata FFMETADATAFILE\n\nReinserting edited metadata information from the FFMETADATAFILE file can be done as:\n\nffmpeg -i INPUT -i FFMETADATAFILE -mapmetadata 1 -codec copy OUTPUT\n", "subsections": [] }, "PROTOCOL OPTIONS": { "content": "The libavformat library provides some generic global options, which can be set on all the\nprotocols. In addition each protocol may support so-called private options, which are\nspecific for that component.\n\nOptions may be set by specifying -option value in the FFmpeg tools, or by setting the value\nexplicitly in the \"AVFormatContext\" options or using the libavutil/opt.h API for programmatic\nuse.\n\nThe list of supported options follows:\n\nprotocolwhitelist list (input)\nSet a \",\"-separated list of allowed protocols. \"ALL\" matches all protocols. Protocols\nprefixed by \"-\" are disabled. All protocols are allowed by default but protocols used by\nan another protocol (nested protocols) are restricted to a per protocol subset.\n", "subsections": [] }, "PROTOCOLS": { "content": "Protocols are configured elements in FFmpeg that enable access to resources that require\nspecific protocols.\n\nWhen you configure your FFmpeg build, all the supported protocols are enabled by default. You\ncan list all available ones using the configure option \"--list-protocols\".\n\nYou can disable all the protocols using the configure option \"--disable-protocols\", and\nselectively enable a protocol using the option \"--enable-protocol=PROTOCOL\", or you can\ndisable a particular protocol using the option \"--disable-protocol=PROTOCOL\".\n\nThe option \"-protocols\" of the ff* tools will display the list of supported protocols.\n\nAll protocols accept the following options:\n", "subsections": [ { "name": "rw_timeout", "content": "Maximum time to wait for (network) read/write operations to complete, in microseconds.\n\nA description of the currently available protocols follows.\n" }, { "name": "amqp", "content": "Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker based publish-subscribe\ncommunication protocol.\n\nFFmpeg must be compiled with --enable-librabbitmq to support AMQP. A separate AMQP broker\nmust also be run. An example open-source AMQP broker is RabbitMQ.\n\nAfter starting the broker, an FFmpeg client may stream data to the broker using the command:\n\nffmpeg -re -i input -f mpegts amqp://[[user]:[password]@]hostname[:port][/vhost]\n\nWhere hostname and port (default is 5672) is the address of the broker. The client may also\nset a user/password for authentication. The default for both fields is \"guest\". Name of\nvirtual host on broker can be set with vhost. The default value is \"/\".\n\nMuliple subscribers may stream from the broker using the command:\n\nffplay amqp://[[user]:[password]@]hostname[:port][/vhost]\n\nIn RabbitMQ all data published to the broker flows through a specific exchange, and each\nsubscribing client has an assigned queue/buffer. When a packet arrives at an exchange, it may\nbe copied to a client's queue depending on the exchange and routingkey fields.\n\nThe following options are supported:\n" }, { "name": "exchange", "content": "Sets the exchange to use on the broker. RabbitMQ has several predefined exchanges:\n\"amq.direct\" is the default exchange, where the publisher and subscriber must have a\nmatching routingkey; \"amq.fanout\" is the same as a broadcast operation (i.e. the data is\nforwarded to all queues on the fanout exchange independent of the routingkey); and\n\"amq.topic\" is similar to \"amq.direct\", but allows for more complex pattern matching\n(refer to the RabbitMQ documentation).\n" }, { "name": "routing_key", "content": "Sets the routing key. The default value is \"amqp\". The routing key is used on the\n\"amq.direct\" and \"amq.topic\" exchanges to decide whether packets are written to the queue\nof a subscriber.\n" }, { "name": "pkt_size", "content": "Maximum size of each packet sent/received to the broker. Default is 131072. Minimum is\n4096 and max is any large value (representable by an int). When receiving packets, this\nsets an internal buffer size in FFmpeg. It should be equal to or greater than the size of\nthe published packets to the broker. Otherwise the received message may be truncated\ncausing decoding errors.\n" }, { "name": "connection_timeout", "content": "The timeout in seconds during the initial connection to the broker. The default value is\nrwtimeout, or 5 seconds if rwtimeout is not set.\n\ndeliverymode mode\nSets the delivery mode of each message sent to broker. The following values are\naccepted:\n\npersistent\nDelivery mode set to \"persistent\" (2). This is the default value. Messages may be\nwritten to the broker's disk depending on its setup.\n\nnon-persistent\nDelivery mode set to \"non-persistent\" (1). Messages will stay in broker's memory\nunless the broker is under memory pressure.\n" }, { "name": "async", "content": "Asynchronous data filling wrapper for input stream.\n\nFill data in a background thread, to decouple I/O operation from demux thread.\n\nasync:\nasync:http://host/resource\nasync:cache:http://host/resource\n" }, { "name": "bluray", "content": "Read BluRay playlist.\n\nThe accepted options are:\n" }, { "name": "angle", "content": "BluRay angle\n" }, { "name": "chapter", "content": "Start chapter (1...N)\n" }, { "name": "playlist", "content": "Playlist to read (BDMV/PLAYLIST/?????.mpls)\n\nExamples:\n\nRead longest playlist from BluRay mounted to /mnt/bluray:\n\nbluray:/mnt/bluray\n\nRead angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start from chapter 2:\n\n-playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray\n" }, { "name": "cache", "content": "Caching wrapper for input stream.\n\nCache the input stream to temporary file. It brings seeking capability to live streams.\n\nThe accepted options are:\n" }, { "name": "read_ahead_limit", "content": "Amount in bytes that may be read ahead when seeking isn't supported. Range is -1 to\nINTMAX. -1 for unlimited. Default is 65536.\n\nURL Syntax is\n\ncache:\n" }, { "name": "concat", "content": "Physical concatenation protocol.\n\nRead and seek from many resources in sequence as if they were a unique resource.\n\nA URL accepted by this protocol has the syntax:\n\nconcat:||...|\n\nwhere URL1, URL2, ..., URLN are the urls of the resource to be concatenated, each one\npossibly specifying a distinct protocol.\n\nFor example to read a sequence of files split1.mpeg, split2.mpeg, split3.mpeg with ffplay use\nthe command:\n\nffplay concat:split1.mpeg\\|split2.mpeg\\|split3.mpeg\n\nNote that you may need to escape the character \"|\" which is special for many shells.\n" }, { "name": "concatf", "content": "Physical concatenation protocol using a line break delimited list of resources.\n\nRead and seek from many resources in sequence as if they were a unique resource.\n\nA URL accepted by this protocol has the syntax:\n\nconcatf:\n\nwhere URL is the url containing a line break delimited list of resources to be concatenated,\neach one possibly specifying a distinct protocol. Special characters must be escaped with\nbackslash or single quotes. See the \"Quoting and escaping\" section in the ffmpeg-utils(1)\nmanual.\n\nFor example to read a sequence of files split1.mpeg, split2.mpeg, split3.mpeg listed in\nseparate lines within a file split.txt with ffplay use the command:\n\nffplay concatf:split.txt\n\nWhere split.txt contains the lines:\n\nsplit1.mpeg\nsplit2.mpeg\nsplit3.mpeg\n" }, { "name": "crypto", "content": "AES-encrypted stream reading protocol.\n\nThe accepted options are:\n\nkey Set the AES decryption key binary block from given hexadecimal representation.\n\niv Set the AES decryption initialization vector binary block from given hexadecimal\nrepresentation.\n\nAccepted URL formats:\n\ncrypto:\ncrypto+\n" }, { "name": "data", "content": "Data in-line in the URI. See .\n\nFor example, to convert a GIF file given inline with ffmpeg:\n\nffmpeg -i \"data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=\" smiley.png\n\nfd\nFile descriptor access protocol.\n\nThe accepted syntax is:\n\nfd: -fd \n\nIf fd is not specified, by default the stdout file descriptor will be used for writing, stdin\nfor reading. Unlike the pipe protocol, fd protocol has seek support if it corresponding to a\nregular file. fd protocol doesn't support pass file descriptor via URL for security.\n\nThis protocol accepts the following options:\n" }, { "name": "blocksize", "content": "Set I/O operation maximum block size, in bytes. Default value is \"INTMAX\", which results\nin not limiting the requested block size. Setting this value reasonably low improves\nuser termination request reaction time, which is valuable if data transmission is slow.\n\nfd Set file descriptor.\n" }, { "name": "file", "content": "File access protocol.\n\nRead from or write to a file.\n\nA file URL can have the form:\n\nfile:\n\nwhere filename is the path of the file to read.\n\nAn URL that does not have a protocol prefix will be assumed to be a file URL. Depending on\nthe build, an URL that looks like a Windows path with the drive letter at the beginning will\nalso be assumed to be a file URL (usually not the case in builds for unix-like systems).\n\nFor example to read from a file input.mpeg with ffmpeg use the command:\n\nffmpeg -i file:input.mpeg output.mpeg\n\nThis protocol accepts the following options:\n" }, { "name": "truncate", "content": "Truncate existing files on write, if set to 1. A value of 0 prevents truncating. Default\nvalue is 1.\n" }, { "name": "blocksize", "content": "Set I/O operation maximum block size, in bytes. Default value is \"INTMAX\", which results\nin not limiting the requested block size. Setting this value reasonably low improves\nuser termination request reaction time, which is valuable for files on slow medium.\n" }, { "name": "follow", "content": "If set to 1, the protocol will retry reading at the end of the file, allowing reading\nfiles that still are being written. In order for this to terminate, you either need to\nuse the rwtimeout option, or use the interrupt callback (for API users).\n" }, { "name": "seekable", "content": "Controls if seekability is advertised on the file. 0 means non-seekable, -1 means auto\n(seekable for normal files, non-seekable for named pipes).\n\nMany demuxers handle seekable and non-seekable resources differently, overriding this\nmight speed up opening certain files at the cost of losing some features (e.g. accurate\nseeking).\n" }, { "name": "ftp", "content": "FTP (File Transfer Protocol).\n\nRead from or write to remote resources using FTP protocol.\n\nFollowing syntax is required.\n\nftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg\n\nThis protocol accepts the following options.\n" }, { "name": "timeout", "content": "Set timeout in microseconds of socket I/O operations used by the underlying low level\noperation. By default it is set to -1, which means that the timeout is not specified.\n" }, { "name": "ftp-user", "content": "Set a user to be used for authenticating to the FTP server. This is overridden by the\nuser in the FTP URL.\n" }, { "name": "ftp-password", "content": "Set a password to be used for authenticating to the FTP server. This is overridden by the\npassword in the FTP URL, or by ftp-anonymous-password if no user is set.\n" }, { "name": "ftp-anonymous-password", "content": "Password used when login as anonymous user. Typically an e-mail address should be used.\n" }, { "name": "ftp-write-seekable", "content": "Control seekability of connection during encoding. If set to 1 the resource is supposed\nto be seekable, if set to 0 it is assumed not to be seekable. Default value is 0.\n\nNOTE: Protocol can be used as output, but it is recommended to not do it, unless special care\nis taken (tests, customized server configuration etc.). Different FTP servers behave in\ndifferent way during seek operation. ff* tools may produce incomplete content due to server\nlimitations.\n" }, { "name": "gopher", "content": "Gopher protocol.\n" }, { "name": "gophers", "content": "Gophers protocol.\n\nThe Gopher protocol with TLS encapsulation.\n" }, { "name": "hls", "content": "Read Apple HTTP Live Streaming compliant segmented stream as a uniform one. The M3U8\nplaylists describing the segments can be remote HTTP resources or local files, accessed using\nthe standard file protocol. The nested protocol is declared by specifying \"+proto\" after the\nhls URI scheme name, where proto is either \"file\" or \"http\".\n\nhls+http://host/path/to/remote/resource.m3u8\nhls+file://path/to/local/resource.m3u8\n\nUsing this protocol is discouraged - the hls demuxer should work just as well (if not, please\nreport the issues) and is more complete. To use the hls demuxer instead, simply use the\ndirect URLs to the m3u8 files.\n" }, { "name": "http", "content": "HTTP (Hyper Text Transfer Protocol).\n\nThis protocol accepts the following options:\n" }, { "name": "seekable", "content": "Control seekability of connection. If set to 1 the resource is supposed to be seekable,\nif set to 0 it is assumed not to be seekable, if set to -1 it will try to autodetect if\nit is seekable. Default value is -1.\n" }, { "name": "chunked_post", "content": "If set to 1 use chunked Transfer-Encoding for posts, default is 1.\n" }, { "name": "content_type", "content": "Set a specific content type for the POST messages or for listen mode.\n" }, { "name": "http_proxy", "content": "set HTTP proxy to tunnel through e.g. http://example.com:1234\n" }, { "name": "headers", "content": "Set custom HTTP headers, can override built in default headers. The value must be a\nstring encoding the headers.\n" }, { "name": "multiple_requests", "content": "Use persistent connections if set to 1, default is 0.\n" }, { "name": "post_data", "content": "Set custom HTTP post data.\n" }, { "name": "referer", "content": "Set the Referer header. Include 'Referer: URL' header in HTTP request.\n" }, { "name": "user_agent", "content": "Override the User-Agent header. If not specified the protocol will use a string\ndescribing the libavformat build. (\"Lavf/\")\n" }, { "name": "reconnect_at_eof", "content": "If set then eof is treated like an error and causes reconnection, this is useful for live\n/ endless streams.\n" }, { "name": "reconnect_streamed", "content": "If set then even streamed/non seekable streams will be reconnected on errors.\n" }, { "name": "reconnect_on_network_error", "content": "Reconnect automatically in case of TCP/TLS errors during connect.\n" }, { "name": "reconnect_on_http_error", "content": "A comma separated list of HTTP status codes to reconnect on. The list can include\nspecific status codes (e.g. '503') or the strings '4xx' / '5xx'.\n" }, { "name": "reconnect_delay_max", "content": "Sets the maximum delay in seconds after which to give up reconnecting\n" }, { "name": "mime_type", "content": "Export the MIME type.\n" }, { "name": "http_version", "content": "Exports the HTTP response version number. Usually \"1.0\" or \"1.1\".\n\nicy If set to 1 request ICY (SHOUTcast) metadata from the server. If the server supports\nthis, the metadata has to be retrieved by the application by reading the\nicymetadataheaders and icymetadatapacket options. The default is 1.\n" }, { "name": "icy_metadata_headers", "content": "If the server supports ICY metadata, this contains the ICY-specific HTTP reply headers,\nseparated by newline characters.\n" }, { "name": "icy_metadata_packet", "content": "If the server supports ICY metadata, and icy was set to 1, this contains the last non-\nempty metadata packet sent by the server. It should be polled in regular intervals by\napplications interested in mid-stream metadata updates.\n" }, { "name": "cookies", "content": "Set the cookies to be sent in future requests. The format of each cookie is the same as\nthe value of a Set-Cookie HTTP response field. Multiple cookies can be delimited by a\nnewline character.\n" }, { "name": "offset", "content": "Set initial byte offset.\n" }, { "name": "end_offset", "content": "Try to limit the request to bytes preceding this offset.\n" }, { "name": "method", "content": "When used as a client option it sets the HTTP method for the request.\n\nWhen used as a server option it sets the HTTP method that is going to be expected from\nthe client(s). If the expected and the received HTTP method do not match the client will\nbe given a Bad Request response. When unset the HTTP method is not checked for now. This\nwill be replaced by autodetection in the future.\n" }, { "name": "listen", "content": "If set to 1 enables experimental HTTP server. This can be used to send data when used as\nan output option, or read data from a client with HTTP POST when used as an input option.\nIf set to 2 enables experimental multi-client HTTP server. This is not yet implemented in\nffmpeg.c and thus must not be used as a command line option.\n\n# Server side (sending):\nffmpeg -i somefile.ogg -c copy -listen 1 -f ogg http://:\n\n# Client side (receiving):\nffmpeg -i http://: -c copy somefile.ogg\n\n# Client can also be done with wget:\nwget http://: -O somefile.ogg\n\n# Server side (receiving):\nffmpeg -listen 1 -i http://: -c copy somefile.ogg\n\n# Client side (sending):\nffmpeg -i somefile.ogg -chunkedpost 0 -c copy -f ogg http://:\n\n# Client can also be done with wget:\nwget --post-file=somefile.ogg http://:\n" }, { "name": "send_expect_100", "content": "Send an Expect: 100-continue header for POST. If set to 1 it will send, if set to 0 it\nwon't, if set to -1 it will try to send if it is applicable. Default value is -1.\n" }, { "name": "auth_type", "content": "Set HTTP authentication type. No option for Digest, since this method requires getting\nnonce parameters from the server first and can't be used straight away like Basic.\n\nnone\nChoose the HTTP authentication type automatically. This is the default.\n\nbasic\nChoose the HTTP basic authentication.\n\nBasic authentication sends a Base64-encoded string that contains a user name and\npassword for the client. Base64 is not a form of encryption and should be considered\nthe same as sending the user name and password in clear text (Base64 is a reversible\nencoding). If a resource needs to be protected, strongly consider using an\nauthentication scheme other than basic authentication. HTTPS/TLS should be used with\nbasic authentication. Without these additional security enhancements, basic\nauthentication should not be used to protect sensitive or valuable information.\n\nHTTP Cookies\n\nSome HTTP requests will be denied unless cookie values are passed in with the request. The\ncookies option allows these cookies to be specified. At the very least, each cookie must\nspecify a value along with a path and domain. HTTP requests that match both the domain and\npath will automatically include the cookie value in the HTTP Cookie header field. Multiple\ncookies can be delimited by a newline.\n\nThe required syntax to play a stream specifying a cookie is:\n\nffplay -cookies \"nlqptid=nltid=tsn; path=/; domain=somedomain.com;\" http://somedomain.com/somestream.m3u8\n" }, { "name": "Icecast", "content": "Icecast protocol (stream to Icecast servers)\n\nThis protocol accepts the following options:\n" }, { "name": "ice_genre", "content": "Set the stream genre.\n" }, { "name": "ice_name", "content": "Set the stream name.\n" }, { "name": "ice_description", "content": "Set the stream description.\n" }, { "name": "ice_url", "content": "Set the stream website URL.\n" }, { "name": "ice_public", "content": "Set if the stream should be public. The default is 0 (not public).\n" }, { "name": "user_agent", "content": "Override the User-Agent header. If not specified a string of the form \"Lavf/\"\nwill be used.\n" }, { "name": "password", "content": "Set the Icecast mountpoint password.\n" }, { "name": "content_type", "content": "Set the stream content type. This must be set if it is different from audio/mpeg.\n" }, { "name": "legacy_icecast", "content": "This enables support for Icecast versions < 2.4.0, that do not support the HTTP PUT\nmethod but the SOURCE method.\n\ntls Establish a TLS (HTTPS) connection to Icecast.\n\nicecast://[[:]@]:/\n" }, { "name": "ipfs", "content": "InterPlanetary File System (IPFS) protocol support. One can access files stored on the IPFS\nnetwork through so-called gateways. These are http(s) endpoints. This protocol wraps the\nIPFS native protocols (ipfs:// and ipns://) to be sent to such a gateway. Users can (and\nshould) host their own node which means this protocol will use one's local gateway to access\nfiles on the IPFS network.\n\nThis protocol accepts the following options:\n" }, { "name": "gateway", "content": "Defines the gateway to use. When not set, the protocol will first try locating the local\ngateway by looking at $IPFSGATEWAY, $IPFSPATH and \"$HOME/.ipfs/\", in that order.\n\nOne can use this protocol in 2 ways. Using IPFS:\n\nffplay ipfs://\n\nOr the IPNS protocol (IPNS is mutable IPFS):\n\nffplay ipns://\n" }, { "name": "mmst", "content": "MMS (Microsoft Media Server) protocol over TCP.\n" }, { "name": "mmsh", "content": "MMS (Microsoft Media Server) protocol over HTTP.\n\nThe required syntax is:\n\nmmsh://[:][/][/]\n" }, { "name": "md5", "content": "MD5 output protocol.\n\nComputes the MD5 hash of the data to be written, and on close writes this to the designated\noutput or stdout if none is specified. It can be used to test muxers without writing an\nactual file.\n\nSome examples follow.\n\n# Write the MD5 hash of the encoded AVI file to the file output.avi.md5.\nffmpeg -i input.flv -f avi -y md5:output.avi.md5\n\n# Write the MD5 hash of the encoded AVI file to stdout.\nffmpeg -i input.flv -f avi -y md5:\n\nNote that some formats (typically MOV) require the output protocol to be seekable, so they\nwill fail with the MD5 output protocol.\n" }, { "name": "pipe", "content": "UNIX pipe access protocol.\n\nRead and write from UNIX pipes.\n\nThe accepted syntax is:\n\npipe:[]\n\nIf fd isn't specified, number is the number corresponding to the file descriptor of the pipe\n(e.g. 0 for stdin, 1 for stdout, 2 for stderr). If number is not specified, by default the\nstdout file descriptor will be used for writing, stdin for reading.\n\nFor example to read from stdin with ffmpeg:\n\ncat test.wav | ffmpeg -i pipe:0\n# ...this is the same as...\ncat test.wav | ffmpeg -i pipe:\n\nFor writing to stdout with ffmpeg:\n\nffmpeg -i test.wav -f avi pipe:1 | cat > test.avi\n# ...this is the same as...\nffmpeg -i test.wav -f avi pipe: | cat > test.avi\n\nThis protocol accepts the following options:\n" }, { "name": "blocksize", "content": "Set I/O operation maximum block size, in bytes. Default value is \"INTMAX\", which results\nin not limiting the requested block size. Setting this value reasonably low improves\nuser termination request reaction time, which is valuable if data transmission is slow.\n\nfd Set file descriptor.\n\nNote that some formats (typically MOV), require the output protocol to be seekable, so they\nwill fail with the pipe output protocol.\n" }, { "name": "prompeg", "content": "Pro-MPEG Code of Practice #3 Release 2 FEC protocol.\n\nThe Pro-MPEG CoP#3 FEC is a 2D parity-check forward error correction mechanism for MPEG-2\nTransport Streams sent over RTP.\n\nThis protocol must be used in conjunction with the \"rtpmpegts\" muxer and the \"rtp\" protocol.\n\nThe required syntax is:\n\n-f rtpmpegts -fec prompeg=