<!DOCTYPE html> <html> <!-- Created on February 9, 2014 by texi2html 5.0 --> <!-- texi2html was written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) Karl Berry <karl@freefriends.org> Olaf Bachmann <obachman@mathematik.uni-kl.de> and many others. Maintained by: Many creative people. Send bugs and suggestions to <texi2html-bug@nongnu.org> --> <head> <title>FFmpeg documentation : FFmpeg Scaler </title> <meta name="description" content="FFmpeg Scaler Documentation: "> <meta name="keywords" content="FFmpeg documentation : FFmpeg Scaler "> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2html 5.0"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="stylesheet" type="text/css" href="default.css" /> <link rel="icon" href="favicon.png" type="image/png" /> </head> <body> <div id="container"> <h1 class="titlefont">FFmpeg Scaler Documentation</h1> <hr> <a name="SEC_Top"></a> <a name="SEC_Contents"></a> <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> </div> <hr size="6"> <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> <footer class="footer pagination-right"> <span class="label label-info">This document was generated on <i>February 9, 2014</i> using <a href="http://www.nongnu.org/texi2html/"><i>texi2html 5.0</i></a>.</span></footer></div>