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Code Issues Releases Wiki Activity

New section about sync and remuxing issues. 

Also tell that AVI and MPEG are only natively supported containers while more can be supported through libavformat


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16421 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2005-09-06 21:33:28 +00:00
parent 92850fab06
commit 956f6bdd47
1 changed files with 38 additions and 1 deletions
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39
DOCS/xml/en/encoding-guide.xml
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@ -1440,7 +1440,7 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
Now that you have encoded your video, you will most likely want
to mux it with one or more audio tracks into a movie container, such
as AVI, MPEG, Matroska or NUT.
<application>MEncoder</application> is currently only able to output
<application>MEncoder</application> is currently only able to natively output
audio and video into MPEG and AVI container formats.
for example:
<screen>mencoder -oac copy -ovc copy -o <replaceable>output_movie.avi</replaceable> -audiofile <replaceable>input_audio.mp2</replaceable> <replaceable>input_video.avi</replaceable></screen>
@ -1467,6 +1467,43 @@ Do not do this! Always use a file or CD/DVD/etc device as input.
means that a pre-packaged binary version will not work in most cases).
</para>
<sect3 id="menc-feat-dvd-mpeg4-muxing-filter-issues">
<title>Improving muxing and A/V sync reliability</title>
<para>
You may experience some serious A/V sync problems while trying to mux
your video and some audio tracks, where no matter how you adjust the
audio delay, you will never get proper sync.
That may happen when you use some video filters that will drop or
duplicate some frames, like the inverse telecine filters.
It is strongly encouraged to append the <option>harddup</option> video
filter at the end of the filter chain to avoid this kind of problem.
</para>
<para>
Without <option>harddup</option>, if <application>MEncoder</application>
wants to duplicate a frame, it relies on the muxer to put a mark on the
container so that the last frame will be displayed again to maintain
sync while writing no actual frame.
With <option>harddup</option>, <application>MEncoder</application>
will instead just push the last frame displayed again into the filter
chain.
This means that the encoder receives the <emphasis>exact</emphasis>
same frame twice, and compresses it.
This will result in a slightly bigger file, but will not cause problems
when demuxing or remuxing into other container formats.
</para>
<para>
You may also have no choice but to use <option>harddup</option> with
container formats that are not too tightly linked with
<application>MEncoder</application> such as the ones supported through
<systemitem class="library">libavformat</systemitem>, which may not
support frame duplication at the container level.
</para>
</sect3>
<sect3 id="menc-feat-dvd-mpeg4-muxing-avi-limitations">
<title>Limitations of the AVI container</title>
<para>