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<h1 class="titlefont">FFmpeg Scaler Documentation</h1>
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<h1>Table of Contents</h1>
<div class="contents">
<ul class="no-bullet">
<li><a name="toc-Description" href="#Description">1 Description</a></li>
<li><a name="toc-Scaler-Options" href="#Scaler-Options">2 Scaler Options</a></li>
<li><a name="toc-See-Also" href="#See-Also">3 See Also</a></li>
<li><a name="toc-Authors" href="#Authors">4 Authors</a></li>
</ul>
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<a name="Description"></a>
<h1 class="chapter"><a href="ffmpeg-scaler.html#toc-Description">1 Description</a></h1>
<p>The FFmpeg rescaler provides an high-level interface to the libswscale
library image conversion utilities. In particular it allows to perform
image rescaling and pixel format conversion.
</p>
<a name="Scaler-Options"></a>
<h1 class="chapter"><a href="ffmpeg-scaler.html#toc-Scaler-Options">2 Scaler Options</a></h1>
<p>The video scaler supports the following named options.
</p>
<p>Options may be set by specifying -<var>option</var> <var>value</var> in the
FFmpeg tools. For programmatic use, they can be set explicitly in the
<code>SwsContext</code> options or through the ‘<tt>libavutil/opt.h</tt>’ API.
</p>
<dl compact="compact">
<dt>‘<samp>sws_flags</samp>’</dt>
<dd><p>Set the scaler flags. This is also used to set the scaling
algorithm. Only a single algorithm should be selected.
</p>
<p>It accepts the following values:
</p><dl compact="compact">
<dt>‘<samp>fast_bilinear</samp>’</dt>
<dd><p>Select fast bilinear scaling algorithm.
</p>
</dd>
<dt>‘<samp>bilinear</samp>’</dt>
<dd><p>Select bilinear scaling algorithm.
</p>
</dd>
<dt>‘<samp>bicubic</samp>’</dt>
<dd><p>Select bicubic scaling algorithm.
</p>
</dd>
<dt>‘<samp>experimental</samp>’</dt>
<dd><p>Select experimental scaling algorithm.
</p>
</dd>
<dt>‘<samp>neighbor</samp>’</dt>
<dd><p>Select nearest neighbor rescaling algorithm.
</p>
</dd>
<dt>‘<samp>area</samp>’</dt>
<dd><p>Select averaging area rescaling algorithm.
</p>
</dd>
<dt>‘<samp>bicubiclin</samp>’</dt>
<dd><p>Select bicubic scaling algorithm for the luma component, bilinear for
chroma components.
</p>
</dd>
<dt>‘<samp>gauss</samp>’</dt>
<dd><p>Select Gaussian rescaling algorithm.
</p>
</dd>
<dt>‘<samp>sinc</samp>’</dt>
<dd><p>Select sinc rescaling algorithm.
</p>
</dd>
<dt>‘<samp>lanczos</samp>’</dt>
<dd><p>Select lanczos rescaling algorithm.
</p>
</dd>
<dt>‘<samp>spline</samp>’</dt>
<dd><p>Select natural bicubic spline rescaling algorithm.
</p>
</dd>
<dt>‘<samp>print_info</samp>’</dt>
<dd><p>Enable printing/debug logging.
</p>
</dd>
<dt>‘<samp>accurate_rnd</samp>’</dt>
<dd><p>Enable accurate rounding.
</p>
</dd>
<dt>‘<samp>full_chroma_int</samp>’</dt>
<dd><p>Enable full chroma interpolation.
</p>
</dd>
<dt>‘<samp>full_chroma_inp</samp>’</dt>
<dd><p>Select full chroma input.
</p>
</dd>
<dt>‘<samp>bitexact</samp>’</dt>
<dd><p>Enable bitexact output.
</p></dd>
</dl>
</dd>
<dt>‘<samp>srcw</samp>’</dt>
<dd><p>Set source width.
</p>
</dd>
<dt>‘<samp>srch</samp>’</dt>
<dd><p>Set source height.
</p>
</dd>
<dt>‘<samp>dstw</samp>’</dt>
<dd><p>Set destination width.
</p>
</dd>
<dt>‘<samp>dsth</samp>’</dt>
<dd><p>Set destination height.
</p>
</dd>
<dt>‘<samp>src_format</samp>’</dt>
<dd><p>Set source pixel format (must be expressed as an integer).
</p>
</dd>
<dt>‘<samp>dst_format</samp>’</dt>
<dd><p>Set destination pixel format (must be expressed as an integer).
</p>
</dd>
<dt>‘<samp>src_range</samp>’</dt>
<dd><p>Select source range.
</p>
</dd>
<dt>‘<samp>dst_range</samp>’</dt>
<dd><p>Select destination range.
</p>
</dd>
<dt>‘<samp>param0, param1</samp>’</dt>
<dd><p>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.
</p>
</dd>
</dl>
<a name="See-Also"></a>
<h1 class="chapter"><a href="ffmpeg-scaler.html#toc-See-Also">3 See Also</a></h1>
<p><a href="ffmpeg.html">ffmpeg</a>, <a href="ffplay.html">ffplay</a>, <a href="ffprobe.html">ffprobe</a>, <a href="ffserver.html">ffserver</a>,
<a href="libswscale.html">libswscale</a>
</p>
<a name="Authors"></a>
<h1 class="chapter"><a href="ffmpeg-scaler.html#toc-Authors">4 Authors</a></h1>
<p>The FFmpeg developers.
</p>
<p>For details about the authorship, see the Git history of the project
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
<code>git log</code> in the FFmpeg source directory, or browsing the
online repository at <a href="http://source.ffmpeg.org">http://source.ffmpeg.org</a>.
</p>
<p>Maintainers for the specific components are listed in the file
‘<tt>MAINTAINERS</tt>’ in the source code tree.
</p>
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