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MEncoder's MPEG muxer needs -vf harddup to function properly, no add a note about this.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17407 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -4214,6 +4214,23 @@ codec</title>
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</sect3>
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<sect3 id="menc-feat-vcd-dvd-a-v-sync">
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<title>Maintaining A/V sync</title>
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<para>
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In order to maintain audio/video synchronization throughout the encode,
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<application>MEncoder</application> has to drop or duplicate frames.
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This works rather well when muxing into an AVI file, but is almost
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guaranteed to fail to maintain A/V sync with other muxers such as MPEG.
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This is why it is necessary to append the
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<option>harddup</option> video filter at the end of the filter chain
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to avoid this kind of problem.
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You can find more technical information about <option>harddup</option>
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in the section
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<link linkend="menc-feat-dvd-mpeg4-muxing-filter-issues">Improving muxing and A/V sync reliability</link>
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or in the manual page.
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</para>
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</sect3>
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<sect3 id="menc-feat-vcd-dvd-output-srate">
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<title>Sample Rate Conversion</title>
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<para>
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