Table of Contents
1 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.
2 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 is0
, which indicates source is limited range.- dst_range (boolean)
If value is set to
1
, enable full range for destination. Default value is0
, 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
3 See Also
ffmpeg, ffplay, ffprobe, libswscale
4 Authors
The FFmpeg developers.
For details about the authorship, see the Git history of the project
(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
git log
in the FFmpeg source directory, or browsing the
online repository at https://git.ffmpeg.org/ffmpeg.
Maintainers for the specific components are listed in the file MAINTAINERS in the source code tree.
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