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<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>13.7.聽Stream copying</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-rescale.html" title="13.6.聽Rescaling movies"><link rel="next" href="menc-feat-enc-images.html" title="13.8.聽Encoding from multiple input image files (JPEG, PNG, TGA, etc.)"><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">13.7.聽Stream copying</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="menc-feat-rescale.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-enc-images.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-streamcopy"></a>13.7.聽Stream copying</h2></div></div></div><p>
<span class="application">MEncoder</span> can handle input streams in two ways:
<span class="bold"><strong>encode</strong></span> or <span class="bold"><strong>copy</strong></span>
them. This section is about <span class="bold"><strong>copying</strong></span>.
</p><div class="itemizedlist"><ul type="disc"><li><p>
<span class="bold"><strong>Video stream</strong></span> (option <tt class="option">-ovc copy</tt>):
nice stuff can be done :) Like, putting (not converting!) FLI or VIVO or
MPEG-1 video into an AVI file! Of course only
<span class="application">MPlayer</span> can play such files :) And it probably
has no real life value at all. Rationally: video stream copying can be
useful for example when only the audio stream has to be encoded (like,
uncompressed PCM to MP3).
</p></li><li><p>
<span class="bold"><strong>Audio stream</strong></span> (option <tt class="option">-oac copy</tt>):
straightforward. It is possible to take an external audio file (MP3,
WAV) and mux it into the output stream. Use the
<tt class="option">-audiofile <em class="replaceable"><code>filename</code></em></tt> option
for this.
</p></li></ul></div><p>
Using <tt class="option">-oac copy</tt> to copy from one container format to
another may require the use of <tt class="option">-fafmttag</tt> to keep the
audio format tag of the original file.
For example, if you are converting an NSV file with AAC audio to an AVI
container, the audio format tag will be incorrect and it will have to
be changed. For a list of audio format tags, check
<tt class="filename">codecs.conf</tt>.
</p><p>
Example:
</p><pre class="screen">
mencoder <em class="replaceable"><code>input.nsv</code></em> -oac copy -fafmttag 0x706D \
-ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell -o <em class="replaceable"><code>output.avi</code></em>
</pre><p>
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