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New FAQ entry: Explain why libavcodec now sets FMP4 FourCC, and how to enventualy change it.

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gpoirier 2005-07-05 16:19:16 +00:00
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DOCS/xml/en/faq.xml
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@ -1158,6 +1158,33 @@ above command.
</para></answer>
</qandaentry>
<qandaentry>
<question><para>
Since 1.0pre7, DivX encoded by <application>MPlayer</application>
cannot be watched on third party players because it sets 'FMP4' as a
FourCC.
</para></question>
<answer><para>
<systemitem class="library">libavcodec</systemitem>, the native MPEG-4
encoding library usually shipped with <application>MEncoder</application>
used to set the 'DIVX' FourCC (which is an AVI tag to identify the
software used to encode and the intended software to use for decoding)
when encoding MPEG-4 videos, which lead to make many people think that
<systemitem class="library">libavcodec</systemitem> was a DivX encoding
library, when in fact it is just another MPEG-4 encoding library whose
MPEG-4 support is much better than DivX's.
Therefore, the new default FourCC used by
<systemitem class="library">libavcodec</systemitem> is 'FMP4', but you
may override this behavior using <application>MEncoder</application>'s
<option>-ffourcc</option>.
You may also change the FourCC of existing files like this:
<screen>
mencoder <replaceable>input.avi</replaceable> -o <replaceable>output.avi</replaceable> -ffourcc DIVX
</screen>
</para></answer>
</qandaentry>
</qandadiv>
</qandaset>