MPEG-4 Part 14

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MP-4 Part 14
Relations between ISO Base Media File Format and MP4 File Format.svg
MPEG-4 Part 14 extends over ISO Base Media File Format (MPEG-4 Part 12). [1]
Filename extension
.mp4, .m4a, .m4p, .m4b, .m4r and .m4v [Note 1]
Internet media type
video/mp4
audio/mp4
Type code mpg4
Developed by International Organization for Standardization
International Electrotechnical Commission
Initial releaseOctober 2001;20 years ago (2001-10)
Latest release
ISO/IEC 14496-14:2020
January 2020;2 years ago (2020-01)
Type of format Container format
Container for Audio, video and text
Extended from QuickTime File Format and MPEG-4 Part 12
Standard ISO/IEC 14496-14
Open format?Yes
Free format?No [2]

MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. The only filename extension for MPEG-4 Part 14 files as defined by the specification is .mp4. MPEG-4 Part 14 (formally ISO/IEC 14496-14:2003) is a standard specified as a part of MPEG-4.

Contents

Portable media players are sometimes advertised as "MP4 Players", although some are simply MP3 Players that also play AMV video or some other video format, and do not necessarily play the MPEG-4 Part 14 format.

History

MPEG-4 Part 14 is an instance of the more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon the QuickTime File Format which was published in 2001. [3] [4] [5] [6] [7] [8] MPEG-4 Part 14 is essentially identical to the QuickTime File Format, but formally specifies support for Initial Object Descriptors (IOD) and other MPEG features. [9] MPEG-4 Part 14 revises and completely replaces Clause 13 of ISO/IEC 14496-1 (MPEG-4 Part 1: Systems), in which the file format for MPEG-4 content was previously specified. [10]

The MPEG-4 file format, version 1 was published in 2001 as ISO/IEC 14496-1:2001, which is a revision of the MPEG-4 Part 1: Systems specification published in 1999 (ISO/IEC 14496-1:1999). [11] [12] [13] In 2003, the first version of the MP4 file format was revised and replaced by MPEG-4 Part 14: MP4 file format (ISO/IEC 14496-14:2003), commonly named as MPEG-4 file format version 2. [14] [15] The MP4 file format was generalized into the ISO Base Media File format ISO/IEC 14496-12:2004, which defines a general structure for time-based media files. It in turn is used as the basis for other file formats in the family (for example MP4, 3GP, Motion JPEG 2000). [4] [16] [17]

MP4 file format versions
VersionRelease dateStandardDescription
MP4 file format version 12001ISO/IEC 14496-1:2001MPEG-4 Part 1 (Systems), First edition
MP4 file format version 22003ISO/IEC 14496-14:2003MPEG-4 Part 14 (MP4 file format), Second edition

The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions. Some of these extensions are also used by other formats based on ISO base media file format (e.g. 3GP). [1] A list of all registered extensions for ISO Base Media File Format is published on the official registration authority website. The registration authority for code-points (identifier values) in "MP4 Family" files is Apple Inc. and it is named in Annex D (informative) in MPEG-4 Part 12. [16] Codec designers should register the codes they invent, but the registration is not mandatory [18] and some invented and used code-points are not registered. [19] When someone is creating a new specification derived from the ISO Base Media File Format, all the existing specifications should be used both as examples and a source of definitions and technology. If an existing specification already covers how a particular media type is stored in the file format (e.g. MPEG-4 audio or video in MP4), that definition should be used and a new one should not be invented. [16]

Filename extensions

While the only filename extension defined by the standard is .mp4, various filename extensions are commonly used to indicate intended content:

Data streams

Most kinds of data can be embedded in MPEG-4 Part 14 files through private streams. A separate hint track is used to include streaming information in the file. The registered codecs for MPEG-4 Part 12-based files are published on the website of MP4 Registration authority (mp4ra.org), [21] but most of them are not widely supported by MP4 players. The widely supported codecs and additional data streams are: [22] [ obsolete source ]

Other compression formats are less used: MPEG-2 and MPEG-1
Also MPEG-4 Part 3 audio objects, such as Audio Lossless Coding (ALS), Scalable Lossless Coding (SLS), MP3, MPEG-1 Audio Layer II (MP2), MPEG-1 Audio Layer I (MP1), CELP, HVXC (speech), TwinVQ, Text To Speech Interface (TTSI) and Structured Audio Orchestra Language (SAOL)
Other compression formats are less used: Apple Lossless, Free Lossless Audio Codec (added in late 2018), and Opus (added in late 2018) [23]
Nero Digital uses DVD Video subtitles in MP4 files

The so-called moov atom contains information about video resolution, frame rates, orientation, display characteristics, and more. It might be placed at the beginning or end of the file. In the latter case, the video file is not playable if the file is incomplete (truncated). [24] [25] [26] [27]

Metadata

MP4 files can contain metadata as defined by the format standard, and in addition, can contain Extensible Metadata Platform (XMP) metadata.

See also

Related Research Articles

MPEG-4 is group of international standards for the compression of digital audio and visual data, multimedia systems, and file storage formats. It was originally introduced in late 1998 as a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) under the formal standard ISO/IEC 14496 – Coding of audio-visual objects. Uses of MPEG-4 include compression of audiovisual data for Internet video and CD distribution, voice and broadcast television applications. The MPEG-4 standard was developed by a group led by Touradj Ebrahimi and Fernando Pereira.

QuickTime Extensible multimedia framework by Apple Inc.

QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images, and interactivity. Created in 1991, the latest Mac version, QuickTime X, is available for Mac OS X Snow Leopard up to macOS Mojave. Apple ceased support for the Windows version of QuickTime in 2016, and ceased support for QuickTime 7 on macOS in 2018.

JPEG 2000 Image compression standard and coding system

JPEG 2000 (JP2) is an image compression standard and coding system. It was developed from 1997 to 2000 by a Joint Photographic Experts Group committee chaired by Touradj Ebrahimi, with the intention of superseding their original JPEG standard, which is based on a discrete cosine transform (DCT), with a newly designed, wavelet-based method. The standardized filename extension is .jp2 for ISO/IEC 15444-1 conforming files and .jpx for the extended part-2 specifications, published as ISO/IEC 15444-2. The registered MIME types are defined in RFC 3745. For ISO/IEC 15444-1 it is image/jp2.

Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. Designed to be the successor of the MP3 format, AAC generally achieves higher sound quality than MP3 encoders at the same bit rate.

MPEG-4 Part 3 or MPEG-4 Audio is the third part of the ISO/IEC MPEG-4 international standard developed by Moving Picture Experts Group. It specifies audio coding methods. The first version of ISO/IEC 14496-3 was published in 1999.

3GP is a multimedia container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services. It is used on 3G mobile phones but can also be played on some 2G and 4G phones.

High-Efficiency Advanced Audio Coding Audio codec

High-Efficiency Advanced Audio Coding (HE-AAC) is an audio coding format for lossy data compression of digital audio defined as an MPEG-4 Audio profile in ISO/IEC 14496–3. It is an extension of Low Complexity AAC (AAC-LC) optimized for low-bitrate applications such as streaming audio. The usage profile HE-AAC v1 uses spectral band replication (SBR) to enhance the modified discrete cosine transform (MDCT) compression efficiency in the frequency domain. The usage profile HE-AAC v2 couples SBR with Parametric Stereo (PS) to further enhance the compression efficiency of stereo signals.

MPEG-4 Part 17, or MPEG-4 Timed Text (MP4TT), or MPEG-4 Streaming text format is the text-based subtitle format for MPEG-4, published as ISO/IEC 14496-17 in 2006. It was developed in response to the need for a generic method for coding of text as one of the multimedia components within audiovisual presentations.

These tables compare features of multimedia container formats, most often used for storing or streaming digital video or digital audio content. To see which multimedia players support which container format, look at comparison of media players.

Flash Video is a container file format used to deliver digital video content over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. There are two different Flash Video file formats: FLV and F4V. The audio and video data within FLV files are encoded in the same way as SWF files. The F4V file format is based on the ISO base media file format, starting with Flash Player 9 update 3. Both formats are supported in Adobe Flash Player and developed by Adobe Systems. FLV was originally developed by Macromedia. In the early 2000s, Flash Video was the de facto standard for web-based streaming video. Users include Hulu, VEVO, Yahoo! Video, metacafe, Reuters.com, and many other news providers.

QuickTime File Format (QTFF) is a computer file format used natively by the QuickTime framework.

The following tables compare general and technical information for a variety of audio coding formats. For listening tests comparing the perceived audio quality of audio formats and codecs, see the article Codec listening test.

MPEG-4 Audio Lossless Coding, also known as MPEG-4 ALS, is an extension to the MPEG-4 Part 3 audio standard to allow lossless audio compression. The extension was finalized in December 2005 and published as ISO/IEC 14496-3:2005/Amd 2:2006 in 2006. The latest description of MPEG-4 ALS was published as subpart 11 of the MPEG-4 Audio standard in December 2019.

MPEG-4 SLS Extension to the MPEG-4 Audio standard

MPEG-4 SLS, or MPEG-4 Scalable to Lossless as per ISO/IEC 14496-3:2005/Amd 3:2006 (Scalable Lossless Coding), is an extension to the MPEG-4 Part 3 (MPEG-4 Audio) standard to allow lossless audio compression scalable to lossy MPEG-4 General Audio coding methods (e.g., variations of AAC). It was developed jointly by the Institute for Infocomm Research (I2R) and Fraunhofer, which commercializes its implementation of a limited subset of the standard under the name of HD-AAC. Standardization of the HD-AAC profile for MPEG-4 Audio is under development (as of September 2009).

MPEG-1 Audio Layer I, commonly abbreviated to MP1, is one of three audio formats included in the MPEG-1 standard. It is a deliberately simplified version of MPEG-1 Audio Layer II, created for applications where lower compression efficiency could be tolerated in return for a less complex algorithm that could be executed with simpler hardware requirements. While supported by most media players, the codec is considered largely obsolete, and replaced by MP2 or MP3.

G.719 is an ITU-T standard audio coding format providing high quality, moderate bit rate wideband audio coding at low computational load. It was produced through a collaboration between Polycom and Ericsson.

The ISMA Encryption and Authentication, Version 1.1 specification specifies encryption and message authentication services for MPEG-4 over RTP streams. It was defined by the Internet Streaming Media Alliance and published on September 15, 2006.

The ISO base media file format (ISOBMFF) is a container file format that defines a general structure for files that contain time-based multimedia data such as video and audio. It is standardized in ISO/IEC 14496-12, a.k.a. MPEG-4 Part 12, and was formerly also published as ISO/IEC 15444-12, a.k.a. JPEG 2000 Part 12.

Audio coding format Digitally coded format for audio signals

An audio coding format is a content representation format for storage or transmission of digital audio. Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. A specific software or hardware implementation capable of audio compression and decompression to/from a specific audio coding format is called an audio codec; an example of an audio codec is LAME, which is one of several different codecs which implements encoding and decoding audio in the MP3 audio coding format in software.

References

  1. 1 2 3GPP2 (18 May 2007). "3GPP2 C.S0050-B Version 1.0, 3GPP2 File Formats for Multimedia Services" (PDF). 3GPP2: 67, 68. Archived from the original (PDF) on 7 October 2009. Retrieved 2009-06-12.{{cite journal}}: Cite journal requires |journal= (help)
  2. ↑ MPEG-4 File Format, Version 2 (Full draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. 2 March 2012. Retrieved 13 December 2021.
  3. ↑ Apple Inc. (2001). "Classic Version of the QuickTime File Format Specification" . Retrieved 2009-06-14.
  4. 1 2 mp4ra.org - MP4 Registration authority. "References, MPEG-4 Registration authority" . Retrieved 2018-08-29.
  5. ↑ ISO (April 2006). "ISO Base Media File Format white paper - Proposal". Archived from the original on 2008-07-14. Retrieved 2009-12-26.{{cite journal}}: Cite journal requires |journal= (help)
  6. ↑ ISO (October 2005). "MPEG-4 File Formats white paper - Proposal". Archived from the original on 2008-01-15. Retrieved 2009-12-26.{{cite journal}}: Cite journal requires |journal= (help)
  7. ↑ ISO (October 2009). "ISO Base Media File Format white paper - Proposal". chiariglione.org. Retrieved 2014-10-31.{{cite journal}}: Cite journal requires |journal= (help)
  8. ↑ Apple Computer. "MPEG-4 Fact Sheet" (PDF). Archived from the original (PDF) on 2014-10-31.
  9. ↑ "RE: QT vs MPEG-4". Archived from the original on 2007-05-10. Retrieved 2007-03-30.
  10. ↑ International Organization for Standardization (2003). "MPEG-4 Part 14: MP4 file format; ISO/IEC 14496-14:2003" . Retrieved 2009-06-11.
  11. ↑ Library of Congress (2001). "MPEG-4 File Format, Version 1" . Retrieved 2009-06-14.
  12. ↑ Network Working Group (2006). "MIME Type Registration for MPEG-4" . Retrieved 2009-06-14.
  13. ↑ International Organization for Standardization (2001). "MPEG-4 Part 1: Systems; ISO/IEC 14496-1:2001" . Retrieved 2009-06-11.
  14. ↑ Library of Congress (2003). "MPEG-4 File Format, Version 2" . Retrieved 2009-06-14.
  15. ↑ "MPEG-4 Systems General Issues". chiariglione.org. July 2001. Retrieved 2010-04-11.
  16. 1 2 3 ISO (2008). "ISO/IEC 14496-12:2008, Information technology -- Coding of audio-visual objects -- Part 12: ISO base media file format" (PDF). International Organization for Standardization: 88, 94. Retrieved 2009-05-30.{{cite journal}}: Cite journal requires |journal= (help)
  17. ↑ International Organization for Standardization (2004). "MPEG-4 Part 12: ISO base media file format; ISO/IEC 14496-12:2004" . Retrieved 2009-06-11.
  18. ↑ Greenberg, Steven (2009). "Registration of ftyp's" . Retrieved 2009-06-15.
  19. ↑ Greenberg, Steven (2009). "Complete List of all known MP4 / QuickTime 'ftyp' designations" . Retrieved 2009-06-15.
  20. ↑ Doom9's Forum, MP4 FAQ, Retrieved on 2009-07-15
  21. ↑ mp4ra.org - MP4 Registration authority, Registered Types - Codecs - ISO Code Points, Retrieved on 2009-07-14.
  22. ↑ Chapman, Nigel; Chapman, Jenny (2004). Digital multimedia (2. ed.). Chichester [u.a.]: Wiley. ISBN   9780470858905.
  23. ↑ "Encapsulation of Opus in ISO Base Media File Format". 2018-08-28. Retrieved 2019-01-05.
  24. ↑ JK (25 January 2013). "Das Moov Atom und wo es stehen sollte". JKdigital (in German).
  25. ↑ "Fehlerhaft kopierte MP4-Datei reparieren" (in German). preamp.org. November 2013.
  26. ↑ eZs3 media service (1 March 2011). "Checking Metadata or Moov Atom Location". www.ezs3.com. Retrieved 11 August 2020.
  27. ↑ Levkov, Maxim. "Understanding the MPEG-4 movie atom | Adobe Developer Connection". www.adobe.com. Adobe Developer Network. Archived from the original on 2021-01-13. Retrieved 11 August 2020.
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