Codecs: Difference between revisions

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Revision as of 19:52, 12 July 2015

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-{{update}}
+{{TOCright}}
-When adding video codec data, we don't want the FourCC value, but the actual codec used to encode the video.
+==Codecs defined in AniDB==
+Instead of keeping track of every possible codec ever conceived they are grouped together in AniDB. After the introduction of [[Avdump2]] it should never be necessary to feed AniDB this data manually.
-'''Why is that?'''
+===H.264/AVC===
+This covers all implementations of the H.264/MPEG-4 AVC standard like, for example, x264.
-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.
+===Xvid===
+All versions of Xvid.
+===DivX 3===
+(also known as DivX ;) )<br>
+Hacked version of the MS Mp43 codec, which is a MS bastard implementation of MPEG-4
-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? -->
+===DivX 4===
-<pre>
+First rewritten version and now standard implementation of MPEG-4 by the DivX group.
-('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')</pre>
-===Trustworthy programs===
+===DivX 5 (also DivX 6)===
-*[[AOM]]
+nd rewritten version by the DivX group. DivX 6 doesn't differ enough to add a separate entry.
-*[http://virtualdubmod.sourceforge.net/ Virtualdubmod]
+===DivX Unk===
+Deprecated. Will be removed at some point.
+===ASP other===
+All other ASP codecs that is not DivX / Xvid / MS MP4x.
+===MPEG-1===
+MPEG-1 is a 1990 standard used to compress audio and video (AV) digital data. MPEG-1 defines a group of AV coding standards agreed upon by MPEG (Moving Picture Experts Group). MPEG-1 video is used by the Video CD format. The output quality at usual VCD bit rates is roughly that of a VCR.<br>
+''(Source: Wikipedia)''
+This includes [[Wikipedia:Video CD|VCD]] and [[Wikipedia:SMPEG|SMPEG]] files.
+===MPEG-2===
+MPEG-2 (1994) is a standard used primarily to compress audio and video (AV) digital data. MPEG-2 is the designation for a group of coding standards for AV, agreed upon by MPEG (Moving Pictures Experts Group), and published as the ISO/IEC 13818 international standard. MPEG-2 is typically used to encode audio and video for broadcast signals, including direct broadcast satellite and Cable TV. MPEG-2, with some modifications, is also the coding format used by standard commercial DVD movies.<br>
+''(Source: Wikipedia)''
+This includes [[Wikipedia:SVCD|SVCD]] and [[Wikipedia:DVD#DVD-Video|DVD]] files.
+===MS Mp4x (also WMV1/2)===
+Microsoft based non-standard implementations of MPEG-4.
+Covers:
+*MS Mp41
+*MS Mp42
+*MS Mp43
+*Windows Media Video 7 (also WMV1)
+*Windows Media Video 8 (also WMV2)
+===Other (non ASP)===
+This covers mostly legacy codecs, but is not limited to:
+*Indeo Video 5 (IV5)
+*Vivo
+*VP3/4/5/6/7
+*Theora
+*Sorenson
+Specify the actual codec in the videostream comment field.
+===RealVideo Other===
+RealVideo is a proprietary video format developed by RealNetworks. It was first released in 1997.
+*RV10: RealVideo 5, first version of RealVideo. (identical to H.263)
+*RV20: RealVideo G2; RealVideo G2+SVT (based on H.263)
+*RV30: RealVideo 8
+''(Source: Wikipedia)''
+If you feel like it specify the actual codec in the video stream comment field. (AOM .6 will/should add a note about it)
+===RealVideo 9/10 (also RV40)===
+*RV40: RealVideo 9; RealVideo 9 EHQ; RealVideo 10
+===Windows Media 9 (also WMV3)===
+Microsoft based non-standard implementations of MPEG-4.
 [[Category:Guidelines]]

Codecs: Difference between revisions

Codecs (view source)

Revision as of 19:52, 12 July 2015

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