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diff --git a/ffmpeg/doc/ffmpeg-scaler.html b/ffmpeg/doc/ffmpeg-scaler.html new file mode 100644 index 0000000..4b5bf0d --- /dev/null +++ b/ffmpeg/doc/ffmpeg-scaler.html @@ -0,0 +1,256 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> + <head> + <meta charset="utf-8"> + <title> + FFmpeg Scaler Documentation + </title> + <meta name="viewport" content="width=device-width,initial-scale=1.0"> + <link rel="stylesheet" type="text/css" href="bootstrap.min.css"> + <link rel="stylesheet" type="text/css" href="style.min.css"> + </head> + <body> + <div class="container"> + <h1> + FFmpeg Scaler Documentation + </h1> +<div align="center"> +</div> + + +<a name="SEC_Top"></a> + +<div class="Contents_element" id="SEC_Contents"> +<h2 class="contents-heading">Table of Contents</h2> + +<div class="contents"> + +<ul class="no-bullet"> + <li><a id="toc-Description" href="#Description">1 Description</a></li> + <li><a id="toc-Scaler-Options" href="#Scaler-Options">2 Scaler Options</a></li> + <li><a id="toc-See-Also" href="#See-Also">3 See Also</a></li> + <li><a id="toc-Authors" href="#Authors">4 Authors</a></li> +</ul> +</div> +</div> + +<a name="Description"></a> +<h2 class="chapter">1 Description<span class="pull-right"><a class="anchor hidden-xs" href="#Description" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Description" aria-hidden="true">TOC</a></span></h2> + +<p>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. +</p> + +<span id="scaler_005foptions"></span><a name="Scaler-Options"></a> +<h2 class="chapter">2 Scaler Options<span class="pull-right"><a class="anchor hidden-xs" href="#Scaler-Options" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Scaler-Options" aria-hidden="true">TOC</a></span></h2> + +<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, with a few API-only exceptions noted below. +For programmatic use, they can be set explicitly in the +<code>SwsContext</code> options or through the <samp>libavutil/opt.h</samp> API. +</p> +<dl compact="compact"> +<dd> +<span id="sws_005fflags"></span></dd> +<dt><span><samp>sws_flags</samp></span></dt> +<dd><p>Set the scaler flags. This is also used to set the scaling +algorithm. Only a single algorithm should be selected. Default +value is ‘<samp>bicubic</samp>’. +</p> +<p>It accepts the following values: +</p><dl compact="compact"> +<dt><span>‘<samp>fast_bilinear</samp>’</span></dt> +<dd><p>Select fast bilinear scaling algorithm. +</p> +</dd> +<dt><span>‘<samp>bilinear</samp>’</span></dt> +<dd><p>Select bilinear scaling algorithm. +</p> +</dd> +<dt><span>‘<samp>bicubic</samp>’</span></dt> +<dd><p>Select bicubic scaling algorithm. +</p> +</dd> +<dt><span>‘<samp>experimental</samp>’</span></dt> +<dd><p>Select experimental scaling algorithm. +</p> +</dd> +<dt><span>‘<samp>neighbor</samp>’</span></dt> +<dd><p>Select nearest neighbor rescaling algorithm. +</p> +</dd> +<dt><span>‘<samp>area</samp>’</span></dt> +<dd><p>Select averaging area rescaling algorithm. +</p> +</dd> +<dt><span>‘<samp>bicublin</samp>’</span></dt> +<dd><p>Select bicubic scaling algorithm for the luma component, bilinear for +chroma components. +</p> +</dd> +<dt><span>‘<samp>gauss</samp>’</span></dt> +<dd><p>Select Gaussian rescaling algorithm. +</p> +</dd> +<dt><span>‘<samp>sinc</samp>’</span></dt> +<dd><p>Select sinc rescaling algorithm. +</p> +</dd> +<dt><span>‘<samp>lanczos</samp>’</span></dt> +<dd><p>Select Lanczos rescaling algorithm. The default width (alpha) is 3 and can be +changed by setting <code>param0</code>. +</p> +</dd> +<dt><span>‘<samp>spline</samp>’</span></dt> +<dd><p>Select natural bicubic spline rescaling algorithm. +</p> +</dd> +<dt><span>‘<samp>print_info</samp>’</span></dt> +<dd><p>Enable printing/debug logging. +</p> +</dd> +<dt><span>‘<samp>accurate_rnd</samp>’</span></dt> +<dd><p>Enable accurate rounding. +</p> +</dd> +<dt><span>‘<samp>full_chroma_int</samp>’</span></dt> +<dd><p>Enable full chroma interpolation. +</p> +</dd> +<dt><span>‘<samp>full_chroma_inp</samp>’</span></dt> +<dd><p>Select full chroma input. +</p> +</dd> +<dt><span>‘<samp>bitexact</samp>’</span></dt> +<dd><p>Enable bitexact output. +</p></dd> +</dl> + +</dd> +<dt><span><samp>srcw <var>(API only)</var></samp></span></dt> +<dd><p>Set source width. +</p> +</dd> +<dt><span><samp>srch <var>(API only)</var></samp></span></dt> +<dd><p>Set source height. +</p> +</dd> +<dt><span><samp>dstw <var>(API only)</var></samp></span></dt> +<dd><p>Set destination width. +</p> +</dd> +<dt><span><samp>dsth <var>(API only)</var></samp></span></dt> +<dd><p>Set destination height. +</p> +</dd> +<dt><span><samp>src_format <var>(API only)</var></samp></span></dt> +<dd><p>Set source pixel format (must be expressed as an integer). +</p> +</dd> +<dt><span><samp>dst_format <var>(API only)</var></samp></span></dt> +<dd><p>Set destination pixel format (must be expressed as an integer). +</p> +</dd> +<dt><span><samp>src_range <var>(boolean)</var></samp></span></dt> +<dd><p>If value is set to <code>1</code>, indicates source is full range. Default value is +<code>0</code>, which indicates source is limited range. +</p> +</dd> +<dt><span><samp>dst_range <var>(boolean)</var></samp></span></dt> +<dd><p>If value is set to <code>1</code>, enable full range for destination. Default value +is <code>0</code>, which enables limited range. +</p> +<span id="sws_005fparams"></span></dd> +<dt><span><samp>param0, param1</samp></span></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> +<dt><span><samp>sws_dither</samp></span></dt> +<dd><p>Set the dithering algorithm. Accepts one of the following +values. Default value is ‘<samp>auto</samp>’. +</p> +<dl compact="compact"> +<dt><span>‘<samp>auto</samp>’</span></dt> +<dd><p>automatic choice +</p> +</dd> +<dt><span>‘<samp>none</samp>’</span></dt> +<dd><p>no dithering +</p> +</dd> +<dt><span>‘<samp>bayer</samp>’</span></dt> +<dd><p>bayer dither +</p> +</dd> +<dt><span>‘<samp>ed</samp>’</span></dt> +<dd><p>error diffusion dither +</p> +</dd> +<dt><span>‘<samp>a_dither</samp>’</span></dt> +<dd><p>arithmetic dither, based using addition +</p> +</dd> +<dt><span>‘<samp>x_dither</samp>’</span></dt> +<dd><p>arithmetic dither, based using xor (more random/less apparent patterning that +a_dither). +</p> +</dd> +</dl> + +</dd> +<dt><span><samp>alphablend</samp></span></dt> +<dd><p>Set the alpha blending to use when the input has alpha but the output does not. +Default value is ‘<samp>none</samp>’. +</p> +<dl compact="compact"> +<dt><span>‘<samp>uniform_color</samp>’</span></dt> +<dd><p>Blend onto a uniform background color +</p> +</dd> +<dt><span>‘<samp>checkerboard</samp>’</span></dt> +<dd><p>Blend onto a checkerboard +</p> +</dd> +<dt><span>‘<samp>none</samp>’</span></dt> +<dd><p>No blending +</p> +</dd> +</dl> + +</dd> +</dl> + + +<a name="See-Also"></a> +<h2 class="chapter">3 See Also<span class="pull-right"><a class="anchor hidden-xs" href="#See-Also" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-See-Also" aria-hidden="true">TOC</a></span></h2> + +<p><a href="ffmpeg.html">ffmpeg</a>, <a href="ffplay.html">ffplay</a>, <a href="ffprobe.html">ffprobe</a>, +<a href="libswscale.html">libswscale</a> +</p> + +<a name="Authors"></a> +<h2 class="chapter">4 Authors<span class="pull-right"><a class="anchor hidden-xs" href="#Authors" aria-hidden="true">#</a> <a class="anchor hidden-xs"href="#toc-Authors" aria-hidden="true">TOC</a></span></h2> + +<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 +<samp>MAINTAINERS</samp> in the source code tree. +</p> + + <p style="font-size: small;"> + This document was generated using <a href="https://www.gnu.org/software/texinfo/"><em>makeinfo</em></a>. + </p> + </div> + </body> +</html> |