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MEncoder's MPEG muxer needs -vf harddup to function properly, no add a note about this.

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17407 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2006-01-16 20:49:07 +00:00
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17
DOCS/xml/en/encoding-guide.xml
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@ -4214,6 +4214,23 @@ codec</title>
</sect3>
<sect3 id="menc-feat-vcd-dvd-a-v-sync">
<title>Maintaining A/V sync</title>
<para>
In order to maintain audio/video synchronization throughout the encode,
<application>MEncoder</application> has to drop or duplicate frames.
This works rather well when muxing into an AVI file, but is almost
guaranteed to fail to maintain A/V sync with other muxers such as MPEG.
This is why it is necessary to append the
<option>harddup</option> video filter at the end of the filter chain
to avoid this kind of problem.
You can find more technical information about <option>harddup</option>
in the section
<link linkend="menc-feat-dvd-mpeg4-muxing-filter-issues">Improving muxing and A/V sync reliability</link>
or in the manual page.
</para>
</sect3>
<sect3 id="menc-feat-vcd-dvd-output-srate">
<title>Sample Rate Conversion</title>
<para>