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Tools for transcoding, streaming and playing of multimedia files


Library for working with various multimedia formats


Library for working with various multimedia formats


ffmpeg-scaler - FFmpeg video scaling and pixel format converter


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.


The video scaler supports the following named options.
Options may be set by specifying -option value in the FFmpeg tools. 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.
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 Set source width.
srch Set source height.
dstw Set destination width.
dsth Set destination height.
src_format Set source pixel format (must be expressed as an integer).
dst_format Set destination pixel format (must be expressed as an integer).
src_range Select source range.
dst_range Select destination 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


The FFmpeg developers.
For details about the authorship, see the Git history of the project (git://, e.g. by typing the command git log in the FFmpeg source directory, or browsing the online repository at <>.
Maintainers for the specific components are listed in the file MAINTAINERS in the source code tree.
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