forked from KolibriOS/kolibrios
272 lines
3.5 KiB
Plaintext
272 lines
3.5 KiB
Plaintext
=encoding utf8
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=head1 NAME
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ffmpeg-scaler - FFmpeg video scaling and pixel format converter
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=head1 DESCRIPTION
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The FFmpeg rescaler provides a high-level interface to the libswscale
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library image conversion utilities. In particular it allows one to perform
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image rescaling and pixel format conversion.
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=head1 SCALER OPTIONS
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The video scaler supports the following named options.
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Options may be set by specifying -I<option> I<value> in the
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FFmpeg tools. For programmatic use, they can be set explicitly in the
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C<SwsContext> options or through the F<libavutil/opt.h> API.
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=over 4
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=item B<sws_flags>
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Set the scaler flags. This is also used to set the scaling
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algorithm. Only a single algorithm should be selected.
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It accepts the following values:
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=over 4
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=item B<fast_bilinear>
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Select fast bilinear scaling algorithm.
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=item B<bilinear>
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Select bilinear scaling algorithm.
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=item B<bicubic>
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Select bicubic scaling algorithm.
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=item B<experimental>
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Select experimental scaling algorithm.
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=item B<neighbor>
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Select nearest neighbor rescaling algorithm.
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=item B<area>
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Select averaging area rescaling algorithm.
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=item B<bicublin>
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Select bicubic scaling algorithm for the luma component, bilinear for
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chroma components.
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=item B<gauss>
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Select Gaussian rescaling algorithm.
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=item B<sinc>
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Select sinc rescaling algorithm.
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=item B<lanczos>
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Select lanczos rescaling algorithm.
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=item B<spline>
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Select natural bicubic spline rescaling algorithm.
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=item B<print_info>
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Enable printing/debug logging.
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=item B<accurate_rnd>
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Enable accurate rounding.
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=item B<full_chroma_int>
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Enable full chroma interpolation.
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=item B<full_chroma_inp>
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Select full chroma input.
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=item B<bitexact>
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Enable bitexact output.
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=back
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=item B<srcw>
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Set source width.
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=item B<srch>
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Set source height.
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=item B<dstw>
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Set destination width.
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=item B<dsth>
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Set destination height.
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=item B<src_format>
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Set source pixel format (must be expressed as an integer).
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=item B<dst_format>
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Set destination pixel format (must be expressed as an integer).
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=item B<src_range>
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Select source range.
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=item B<dst_range>
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Select destination range.
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=item B<param0, param1>
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Set scaling algorithm parameters. The specified values are specific of
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some scaling algorithms and ignored by others. The specified values
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are floating point number values.
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=item B<sws_dither>
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Set the dithering algorithm. Accepts one of the following
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values. Default value is B<auto>.
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=over 4
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=item B<auto>
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automatic choice
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=item B<none>
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no dithering
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=item B<bayer>
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bayer dither
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=item B<ed>
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error diffusion dither
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=item B<a_dither>
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arithmetic dither, based using addition
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=item B<x_dither>
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arithmetic dither, based using xor (more random/less apparent patterning that
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a_dither).
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=back
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=item B<alphablend>
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Set the alpha blending to use when the input has alpha but the output does not.
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Default value is B<none>.
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=over 4
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=item B<uniform_color>
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Blend onto a uniform background color
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=item B<checkerboard>
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Blend onto a checkerboard
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=item B<none>
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No blending
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=back
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=back
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=head1 SEE ALSO
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ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libswscale(3)
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=head1 AUTHORS
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The FFmpeg developers.
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For details about the authorship, see the Git history of the project
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(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
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B<git log> in the FFmpeg source directory, or browsing the
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online repository at E<lt>B<http://source.ffmpeg.org>E<gt>.
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Maintainers for the specific components are listed in the file
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F<MAINTAINERS> in the source code tree.
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