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