MPEG-4

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|subcat=Video
 
|subcat=Video
 
|thiscat=MPEG-4
 
|thiscat=MPEG-4
|extensions={{ext|mp4}}, {{ext|aac}}, others
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|extensions={{ext|mp4}}, others
 
}}
 
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[[MPEG-4]] is an expansive collection of standards related to a set of multimedia formats. It is developed by the Moving Picture Experts Group, codified as ISO/IEC 14496. Saying just what the "MPEG-4 file format" is, is a somewhat complicated question. Parts 12, 14, and 15 specifically refer to "file formats".
 
[[MPEG-4]] is an expansive collection of standards related to a set of multimedia formats. It is developed by the Moving Picture Experts Group, codified as ISO/IEC 14496. Saying just what the "MPEG-4 file format" is, is a somewhat complicated question. Parts 12, 14, and 15 specifically refer to "file formats".
  
Part 3 defines compressed audio formats, including [[MPEG-4 ALS|ALS]] and [[MPEG-4 SLS|SLS]].
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Part 3 defines compressed audio formats, including [[AAC]], [[MPEG-4 ALS|ALS]], and [[MPEG-4 SLS|SLS]].
  
 
Part 10: Refer to [[H.264]].
 
Part 10: Refer to [[H.264]].
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* [http://www.mp4ra.org/ MP4 Registration Authority]
 
* [http://www.mp4ra.org/ MP4 Registration Authority]
 
* RFC 4337: MPEG-4 MIME type registration
 
* RFC 4337: MPEG-4 MIME type registration
* [http://inkdroid.org/journal/2014/05/23/realaudio-aac-and-archivy/ RealAudio, AAC and Archivy]
 
  
 
[[Category:Audio and Music]]
 
[[Category:Audio and Music]]

Revision as of 13:50, 1 June 2014

File Format
Name MPEG-4
Ontology
Extension(s) .mp4, others
MPEG-4 is an expansive collection of standards related to a set of multimedia formats. It is developed by the Moving Picture Experts Group, codified as ISO/IEC 14496. Saying just what the "MPEG-4 file format" is, is a somewhat complicated question. Parts 12, 14, and 15 specifically refer to "file formats".

Part 3 defines compressed audio formats, including AAC, ALS, and SLS.

Part 10: Refer to H.264.

Part 12: Refer to ISO Base Media File Format.

Part 14: Refer to MP4.

Part 15: Refer to AVC (file format).

Part 22: Refer to Open Font Format.

"MP4 audio players" don't always support the MPEG-4 file formats, sometimes supporting only the AAC audio encoding from MPEG-4, Part 3 (aka MPEG-4 Audio). These would more properly be called AAC files, with the extension ".aac".

MPEG-4 is encumbered by numerous patents, and (at least) commercial implementers have to secure licenses. Many of the licensing aspects are handled by a group called MPEG LA.

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