Difference between revisions of "Codecs"

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{{update}}
 
{{update}}
  
When adding video codec data, we don't want the FourCC, but the real used codec.
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When adding video codec data, we don't want the FourCC value, but the actual codec used in encoding the video.
  
 
'''Why is that?'''
 
'''Why is that?'''

Revision as of 19:34, 25 May 2005

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When adding video codec data, we don't want the FourCC value, but the actual codec used in encoding the video.

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')

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