Difference between revisions of "Codecs"

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(wikiup++!!!!11)
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When adding videocodecs we don't want the FourCC, but the real used codec.
 
When adding videocodecs we don't want the FourCC, but the real used codec.
  
'''Why that?'''
+
'''Why is that?'''
  
Groups often change the FourCC to increase "compatibility" so adding the FourCC is just wrong.<br>
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Groups often change the FourCC to increase "compatibility" so adding the FourCC is sometimes just wrong. However, many modern groups set/leave it to the correct value, and modern containers (Matroska) have no need for FourCCs anymore.
  
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 +
The following is a table showing the codec detection rules used by [[AOM]], in order: FourCC, Codec, short name of codec, ??? <!-- what's the final value? -->
 
<pre>
 
<pre>
 
('div3',      'DivX 3 Low-Motion',  'DivX3',    '3'),
 
('div3',      'DivX 3 Low-Motion',  'DivX3',    '3'),
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('mp43',      'S-Mpeg 4 version 3', 'MS MP4x', '18')</pre>
 
('mp43',      'S-Mpeg 4 version 3', 'MS MP4x', '18')</pre>
  
===Trustworthy Programs===
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===Trustworthy programs===
 
*[[AOM]]
 
*[[AOM]]
 
*[http://virtualdubmod.sourceforge.net/ Virtualdubmod]
 
*[http://virtualdubmod.sourceforge.net/ Virtualdubmod]
  
 
[[Category:Guidelines]]
 
[[Category:Guidelines]]

Revision as of 19:31, 25 May 2005

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When adding videocodecs we don't want the FourCC, but the real used codec.

Why is that?

Groups often change the FourCC to increase "compatibility" so adding the FourCC is sometimes just wrong. However, many modern groups set/leave it to the correct value, and modern containers (Matroska) have no need for FourCCs anymore.


The following is a table showing the codec detection rules used by AOM, in order: FourCC, Codec, short name of codec, ???

('div3',      'DivX 3 Low-Motion',  'DivX3',    '3'),
('div3/div3', 'DivX 3 Low-Motion',  'DivX3',    '3'),
('div4/div3', 'DivX 3 Fast-Motion', 'DivX3',    '3'),
('div5',      'DivX 5.0',           'DivX5',    '7'),
('dx50',      'DivX 5.0',           'DivX5',    '7'),
('xvid/dx50', 'DivX 5.0',           'DivX5',    '7'),
('divx/dx50', 'DivX 5.0',           'DivX5',    '7'),
('divx',      'DivX 4 (OpenDivX)',  'DivX4',    '5'),
('divx/divx', 'DivX 4 (OpenDivX)',  'DivX4',    '5'),
('DIVX/DIVX', 'XviD',               'XviD',    '17'),
('xvid',      'XviD',               'XviD',    '17'),
('xvid/xvid', 'XviD',               'XviD',    '17'),
('xvid/divx', 'DivX 4 (OpenDivX)',  'DivX4',    '5'),
('mp42',      'S-Mpeg 4 version 2', 'MS MP4x', '18'),
('mp43',      'S-Mpeg 4 version 3', 'MS MP4x', '18')

Trustworthy programs