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Suggestions and fixes by The Wanderer and Rich 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15923 b3059339-0415-0410-9bf9-f77b7e298cf2
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gpoirier 2005-07-05 22:08:25 +00:00
parent e0323721f5
commit 7bde74f07f
1 changed files with 20 additions and 10 deletions
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DOCS/xml/en/faq.xml
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@ -1167,21 +1167,31 @@ FourCC.
<answer><para> <answer><para>
<systemitem class="library">libavcodec</systemitem>, the native MPEG-4 <systemitem class="library">libavcodec</systemitem>, the native MPEG-4
encoding library usually shipped with <application>MEncoder</application> encoding library usually shipped with <application>MEncoder</application>,
used to set the 'DIVX' FourCC (which is an AVI tag to identify the used to set the FourCC to 'DIVX' when encoding MPEG-4 videos
software used to encode and the intended software to use for decoding) (the FourCC is an AVI tag to identify the software used to encode and
when encoding MPEG-4 videos, which lead to make many people think that the intended software to use for decoding the video).
<systemitem class="library">libavcodec</systemitem> was a DivX encoding This led many people to think that
library, when in fact it is just another MPEG-4 encoding library whose <systemitem class="library">libavcodec</systemitem>
MPEG-4 support is much better than DivX's. was a DivX encoding library, when in fact it is a completely different
MPEG-4 encoding library whose MPEG-4 support is much better than DivX's.
Therefore, the new default FourCC used by Therefore, the new default FourCC used by
<systemitem class="library">libavcodec</systemitem> is 'FMP4', but you <systemitem class="library">libavcodec</systemitem> is 'FMP4', but you
may override this behavior using <application>MEncoder</application>'s may override this behavior using <application>MEncoder</application>'s
<option>-ffourcc</option>. <option>-ffourcc</option> option.
You may also change the FourCC of existing files like this: You may also change the FourCC of existing files in this same way:
<screen> <screen>
mencoder <replaceable>input.avi</replaceable> -o <replaceable>output.avi</replaceable> -ffourcc DIVX mencoder <replaceable>input.avi</replaceable> -o <replaceable>output.avi</replaceable> -ffourcc XVID
</screen> </screen>
Note that this will set the FourCC as XVID rather than as DIVX.
This is recommended as DIVX FourCC means DivX4, which is a very basic
MPEG-4 codec, whereas DX50 and XVID both mean full MPEG-4 (ASP).
Therefore, if you change the FourCC to DIVX, some bad software or
hardware players may choke on some advanced features that
<systemitem class="library">libavcodec</systemitem> supports, but DivX
doesn't, whereas <systemitem class="library">XviD</systemitem> closer
to <systemitem class="library">libavcodec</systemitem> in terms of
functionalities, and is supported but all decent players.
</para></answer> </para></answer>
</qandaentry> </qandaentry>