MPEG-4

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|extensions={{ext|mp4}}, {{ext|m4a}}, {{ext|m4p}}, {{ext|m4b}}, {{ext|m4r}}, {{ext|m4v}}, {{ext|avc}}, {{ext|aac}}
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|subcat2=MPEG
|mimetypes={{mimetype|audio/mp4}}, {{mimetype|video/mp4}}
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|thiscat=MPEG-4
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|extensions={{ext|mp4}}, {{ext|m4a}}, {{ext|m4b}}, {{ext|m4p}}, {{ext|m4r}}, {{ext|aac}}
 
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'''MP4''' is the popular name for the MPEG-4 standard, defined by the Moving Picture Experts Group, codified as ISO/IEC 14496. Saying just what the "MP4 file format" is, is a somewhat complicated question. Parts 12, 14, and 15 specifically refer to "file formats.".
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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".
  
Part 12 is known as ISO Base Media File Format. It is derived largely from Apple's QuickTime format and is described as a "general format for timed sequences of media data."
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Part 3 defines compressed audio formats, including [[AAC]], [[MPEG-4 ALS|ALS]], and [[MPEG-4 SLS|SLS]].
  
Part 14 is an extension of Part 12. The recommended extension for it is ".mp4", though ".m4a" is often used for audio-only files. It is standardized by SO/IEC 14496-14.
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Part 10: Refer to [[H.264]].
  
Part 15 is "MPEG-4 File Format for Advanced Video Coding." This specifies the use of Part 10 encoding with the Part 12 file format. the extension ".avc" is often used with it.
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Part 12: Refer to [[ISO Base Media File 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".
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Part 14: Refer to [[MP4]].
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Part 15: Refer to [[AVC (file format)]].
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Part 22: Refer to [[Open Font Format]].
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"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.
 
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.
  
 
== Links ==
 
== Links ==
* [[Wikipedia:MPEG-4 Part 14|Wikipedia article: MPEG-4 Part 14]]
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* [[Wikipedia:MPEG-4|Wikipedia: MPEG-4]]
 
* [http://www.mp4ra.org/ MP4 Registration Authority]
 
* [http://www.mp4ra.org/ MP4 Registration Authority]
* RFC 4337 (MPEG-4 MIME type registration)
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* RFC 4337: MPEG-4 MIME type registration
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[[Category:Audio and Music]]

Latest revision as of 05:08, 26 May 2021

File Format
Name MPEG-4
Ontology
Extension(s) .mp4, .m4a, .m4b, .m4p, .m4r, .aac
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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