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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>13.3.聽Encoding two pass MPEG-4 ("DivX")</title><link rel="stylesheet" href="default.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="MPlayer - The Movie Player"><link rel="up" href="mencoder.html" title="Chapter聽13.聽Basic usage of MEncoder"><link rel="prev" href="menc-feat-selecting-input.html" title="13.2.聽Selecting input file or device"><link rel="next" href="menc-feat-handheld-psp.html" title="13.4.聽Encoding to Sony PSP video format"><link rel="preface" href="howtoread.html" title="How to read this documentation"><link rel="chapter" href="intro.html" title="Chapter聽1.聽Introduction"><link rel="chapter" href="install.html" title="Chapter聽2.聽Installation"><link rel="chapter" href="usage.html" title="Chapter聽3.聽Usage"><link rel="chapter" href="cd-dvd.html" title="Chapter聽4.聽CD/DVD usage"><link rel="chapter" href="faq.html" title="Chapter聽5.聽Frequently Asked Questions"><link rel="chapter" href="containers.html" title="Chapter聽6.聽Containers"><link rel="chapter" href="codecs.html" title="Chapter聽7.聽Codecs"><link rel="chapter" href="video.html" title="Chapter聽8.聽Video output devices"><link rel="chapter" href="audio.html" title="Chapter聽9.聽Audio output devices"><link rel="chapter" href="tv.html" title="Chapter聽10.聽TV"><link rel="chapter" href="radio.html" title="Chapter聽11.聽Radio"><link rel="chapter" href="ports.html" title="Chapter聽12.聽Ports"><link rel="chapter" href="mencoder.html" title="Chapter聽13.聽Basic usage of MEncoder"><link rel="chapter" href="encoding-guide.html" title="Chapter聽14.聽Encoding with MEncoder"><link rel="appendix" href="bugreports.html" title="Appendix聽A.聽How to report bugs"><link rel="appendix" href="bugs.html" title="Appendix聽B.聽Known bugs"><link rel="appendix" href="skin.html" title="Appendix聽C.聽MPlayer skin format"><link rel="appendix" href="history.html" title="Appendix聽D.聽History"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">13.3.聽Encoding two pass MPEG-4 ("DivX")</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="menc-feat-selecting-input.html">Prev</a>聽</td><th width="60%" align="center">Chapter聽13.聽Basic usage of <span class="application">MEncoder</span></th><td width="20%" align="right">聽<a accesskey="n" href="menc-feat-handheld-psp.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="menc-feat-mpeg4"></a>13.3.聽Encoding two pass MPEG-4 ("DivX")</h2></div></div></div><p>
The name comes from the fact that this method encodes the file
<span class="emphasis"><em>twice</em></span>. The first encoding (dubbed pass) creates some
temporary files (<tt class="filename">*.log</tt>) with a size of few megabytes, do
not delete them yet (you can delete the AVI or rather just not create any video
by redirecting it into <tt class="filename">/dev/null</tt>).
In the second pass, the two pass output
file is created, using the bitrate data from the temporary files. The
resulting file will have much better image quality. If this is the first
time you heard about this, you should consult some guides available on the
net.
</p><div class="example"><a name="copy_audio_track"></a><p class="title"><b>Example聽13.2.聽copy audio track</b></p><div class="example-contents"><p>
Two pass encode of the second track a DVD to an MPEG-4 ("DivX")
AVI while copying the audio track.
</p><pre class="screen">
mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o /dev/null
mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vpass=2 \
-oac copy -o <em class="replaceable"><code>output.avi</code></em>
</pre><p>
</p></div></div><br class="example-break"><div class="example"><a name="encode_audio_track"></a><p class="title"><b>Example聽13.3.聽encode audio track</b></p><div class="example-contents"><p>
Two pass encode of a DVD to an MPEG-4 ("DivX") AVI while encoding
the audio track to MP3.
Be careful using this method as it may lead to audio/video desync in
some cases.
</p><pre class="screen">
mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 \
-oac mp3lame -lameopts vbr=3 -o /dev/null
mencoder dvd://2 -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell:vpass=2 \
-oac mp3lame -lameopts vbr=3 -o <em class="replaceable"><code>output.avi</code></em>
</pre><p>
</p></div></div><br class="example-break"></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="menc-feat-selecting-input.html">Prev</a>聽</td><td width="20%" align="center"><a accesskey="u" href="mencoder.html">Up</a></td><td width="40%" align="right">聽<a accesskey="n" href="menc-feat-handheld-psp.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">13.2.聽Selecting input file or device聽</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">聽13.4.聽Encoding to Sony PSP video format</td></tr></table></div></body></html>
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