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FFMPEG-SCALER(1) FFMPEG-SCALER(1)
NAME
ffmpeg-scaler - FFmpeg video scaling and pixel format converter
DESCRIPTION
The FFmpeg rescaler provides a high-level interface to the libswscale library image
conversion utilities. In particular it allows one to perform image rescaling and pixel
format conversion.
SCALER OPTIONS
The video scaler supports the following named options.
Options may be set by specifying -option value in the FFmpeg tools, with a few API-only
exceptions noted below. For programmatic use, they can be set explicitly in the
"SwsContext" options or through the libavutil/opt.h API.
sws_flags
Set the scaler flags. This is also used to set the scaling algorithm. Only a single
algorithm should be selected. Default value is bicubic.
It accepts the following values:
fast_bilinear
Select fast bilinear scaling algorithm.
bilinear
Select bilinear scaling algorithm.
bicubic
Select bicubic scaling algorithm.
experimental
Select experimental scaling algorithm.
neighbor
Select nearest neighbor rescaling algorithm.
area
Select averaging area rescaling algorithm.
bicublin
Select bicubic scaling algorithm for the luma component, bilinear for chroma
components.
gauss
Select Gaussian rescaling algorithm.
sinc
Select sinc rescaling algorithm.
lanczos
Select Lanczos rescaling algorithm. The default width (alpha) is 3 and can be
changed by setting "param0".
spline
Select natural bicubic spline rescaling algorithm.
print_info
Enable printing/debug logging.
accurate_rnd
Enable accurate rounding.
full_chroma_int
Enable full chroma interpolation.
full_chroma_inp
Select full chroma input.
bitexact
Enable bitexact output.
srcw (API only)
Set source width.
srch (API only)
Set source height.
dstw (API only)
Set destination width.
dsth (API only)
Set destination height.
src_format (API only)
Set source pixel format (must be expressed as an integer).
dst_format (API only)
Set destination pixel format (must be expressed as an integer).
src_range (boolean)
If value is set to 1, indicates source is full range. Default value is 0, which
indicates source is limited range.
dst_range (boolean)
If value is set to 1, enable full range for destination. Default value is 0, which
enables limited range.
param0, param1
Set scaling algorithm parameters. The specified values are specific of some scaling
algorithms and ignored by others. The specified values are floating point number
values.
sws_dither
Set the dithering algorithm. Accepts one of the following values. Default value is
auto.
auto
automatic choice
none
no dithering
bayer
bayer dither
ed error diffusion dither
a_dither
arithmetic dither, based using addition
x_dither
arithmetic dither, based using xor (more random/less apparent patterning that
a_dither).
alphablend
Set the alpha blending to use when the input has alpha but the output does not.
Default value is none.
uniform_color
Blend onto a uniform background color
checkerboard
Blend onto a checkerboard
none
No blending
SEE ALSO
ffmpeg(1), ffplay(1), ffprobe(1), libswscale(3)
AUTHORS
The FFmpeg developers.
For details about the authorship, see the Git history of the project
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command git log in the FFmpeg source
directory, or browsing the online repository at <http://source.ffmpeg.org>.
Maintainers for the specific components are listed in the file MAINTAINERS in the source
code tree.
FFMPEG-SCALER(1)
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