MPEG-4

From Just Solve the File Format Problem
(Difference between revisions)
Jump to: navigation, search
(A little more stuff)
 
(12 intermediate revisions by 3 users not shown)
Line 1: Line 1:
 
{{FormatInfo
 
{{FormatInfo
 
|formattype=electronic
 
|formattype=electronic
|subcat=Audio and Music
+
|subcat=Video
|extensions={{ext|mp4}}
+
|subcat2=MPEG
|mimetypes={{mimetype|audio/mp4,video/mp4}}
+
|thiscat=MPEG-4
 +
|extensions={{ext|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".
  
'''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.".
+
Part 3 defines compressed audio formats, including [[AAC]], [[MPEG-4 ALS|ALS]], and [[MPEG-4 SLS|SLS]].
  
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."
+
Part 10: Refer to [[H.264]].
  
Part 14 is an extension of Part 12. The recommended extension for it is ".mp4", though ".m4a" is often used for audio-only files.
+
Part 12: Refer to [[ISO Base Media File Format]].
  
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.
+
Part 14: Refer to [[MP4]].
  
"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).
+
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.
 +
 
 +
== Links ==
 +
* [[Wikipedia:MPEG-4|Wikipedia: MPEG-4]]
 +
* [http://www.mp4ra.org/ MP4 Registration Authority]
 +
* RFC 4337: MPEG-4 MIME type registration
 +
 
 +
[[Category:Audio and Music]]

Latest revision as of 15:10, 7 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.

[edit] Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox