MPEG-4 Part 14 or MP4 , officially known as ISO / IEC 14496-14: 2003 , is a media container format that is part of the MPEG-4 standard. It is used for packaging digital video and audio streams, subtitles, posters and metadata , as determined by the MPEG team. Like most modern media containers, MPEG-4 Part 14 provides the ability to display video over the Internet , in addition to the file, metadata containing the information necessary for broadcasting is transmitted. The container allows you to pack multiple video and audio streams, as well as subtitles [1] [2] [3] [4] [5] .
| MPEG-4 Part 14 (MP4) | |
|---|---|
 MPEG-4 Part 14 as an extension of the ISO Base Media File Format (MPEG-4 Part 12). | |
| Expansion | .mp4 |
| MIME type | video / mp4, audio / mp4, application / mp4 |
| Developer | ISO |
| Format type | container |
| Contains | Audio, video and text. |
| Expanded from | MPEG-4 Part 12 |
| Standard (s) | ISO / IEC 14496-14 |
Content
- 1 Data Formats
- 2 Unofficial Extensions
- 3 Metadata
- 4 See also
- 5 notes
- 6 References
Data Formats
The MPEG-4 Part 14 container supports the following data formats:
- Video streams: H.264 / MPEG-4 Part 10 , MPEG-4 Part 2, H.262 / MPEG-2 Part 2, H.261 / MPEG-1 Part 2.
- Audio streams: MPEG-4 Part 3, MPEG-2 Part 7 , MPEG-1 Audio Layer III , MPEG-1 Audio Layer II , MPEG-1 Audio Layer I.
- Subtitles: MPEG-4 Part 17.
- Still images: JPEG , PNG .
Currently, the most widely used combination of H.264 / MPEG-4 Part 10 and Advanced Audio Coding , since most players have the hardware capabilities of decoding these streams.
Unofficial Extensions
Apple actively uses the MP4 container, but uses its own, not provided for by the standard, file extensions:
- .m4a is an audio file containing a stream in AAC or ALAC format. May be renamed to .mp4;
- .m4v - a file containing audio and video streams. May be renamed to .mp4;
- .m4b - AAC file that supports bookmarks. Used for audio books and podcasts ; used in online stores like the Apple iTunes Store ;
- .m4p is a protected AAC file. It is used to protect the file from copying while legally downloading proprietary music in online stores such as the Apple iTunes Store ;
- .m4r - ringtone file used in Apple iOS .
Metadata
MP4 files may contain metadata defined by the standard, such as: file creation time, duration, language code of the stream, album name, legal status of the work, etc.
See also
- Media container
- Comparison of multimedia containers
- Comparison of digital audio formats
Notes
- ↑ mp4ra.org - MP4 Registration authority. References, MPEG-4 Registration authority . Archived August 26, 2012.
- ↑ ISO . ISO Base Media File Format white paper - Proposal (neopr.) . - archive.org, 2006. - April. Archived July 14, 2008.
- ↑ ISO . MPEG-4 File Formats white paper - Proposal (neopr.) . - archive.org, 2005. - October. Archived January 15, 2008.
- ↑ ISO . ISO Base Media File Format white paper - Proposal (neopr.) . - chiariglione.org, 2009. - October.
- ↑ Apple Computer. MPEG-4 Fact Sheet . Archived August 26, 2012.
Links
- The MP4 registration authority
- RFC 4337 - MIME Type Registration for MPEG-4