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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>
<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.
encoding library usually shipped with <application>MEncoder</application>,
used to set the FourCC to 'DIVX' when encoding MPEG-4 videos
(the FourCC is an AVI tag to identify the software used to encode and
the intended software to use for decoding the video).
This led many people to think that
<systemitem class="library">libavcodec</systemitem>
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
<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:
<option>-ffourcc</option> option.
You may also change the FourCC of existing files in this same way:
<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>
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>
</qandaentry>