MPEG-4 Part 14 (MP4)

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
Type code	mpg4
Developed by	International Organization for Standardization (ISO)
Type of format	Media container
Container for	Audio, video and text
Extended from	QuickTime File Format and MPEG-4 Part 12
Standard(s)	ISO/IEC 14496-14

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

Some devices advertised as "MP4 Players" 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.^[2][3]

History of MP4[link]

MPEG-4 Part 14 is an instance of more general ISO/IEC 14496-12:2004 (MPEG-4 Part 12: ISO base media file format) which is directly based upon QuickTime File Format.^{[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 specification was created on the basis of the QuickTime format specification published in 2001.^[11] 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).^[12][13][14] In 2003, the first version of 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.^[15][16] 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][17][18]

The MP4 file format defined some extensions over 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 www.mp4ra.org. The registration authority for code-points (identifier values) in "MP4 Family" files is Apple Computer Inc. and it is named in Annex D (informative) in MPEG-4 Part 12.^[17] Codec designers should register the codes they invent, but the registration is not mandatory^[19] and some invented and used code-points are not registered.^[20] 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.^[17]

Filename extensions[link]

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

• MPEG-4 files with audio and video generally use the standard .mp4 extension.
• Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of non-protected content.
  • MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store use the .m4p extension. iTunes Plus tracks, that the iTunes Store currently sells, are unencrypted and use .m4a accordingly.
  • Audio book and podcast files, which also contain metadata including chapter markers, images, and hyperlinks, can use the extension .m4a, but more commonly use the .m4b extension. An .m4a audio file cannot "bookmark" (remember the last listening spot), whereas .m4b extension files can.
  • The Apple iPhone uses MPEG-4 audio for its ringtones but uses the .m4r extension rather than the .m4a extension.
• Raw MPEG-4 Visual bitstreams are named .m4v but this extension is also sometimes used for video in MP4 container format.^[21]
• Mobile phones use 3GP, an implementation of MPEG-4 Part 12 (a.k.a. MPEG-4/JPEG2000 ISO Base Media file format), similar to MP4. It uses .3gp and .3g2 extensions. These files also store non-MPEG-4 data (H.263, AMR, TX3G).

.MP4 versus .M4A[link]

M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files.

The existence of two different filename extensions, .MP4 and .M4A, for naming audio-only MP4 files has been a source of confusion among users and multimedia playback software. Some file managers, such as Windows Explorer, look up the media type and associated applications of a file based on its filename extension. But since MPEG-4 Part 14 is a container format, MPEG-4 files may contain any number of audio, video, and even subtitle streams, making it impossible to determine the type of streams in an MPEG-4 file based on its filename extension alone. In response, Apple Inc. started using and popularizing the .m4a filename extension, which is used for MP4 containers with audio data in the Advanced Audio Coding (AAC) or its own Apple Lossless (ALE, ALAC) formats. Software capable of audio/video playback should recognize files with either .m4a or .mp4 filename extensions, as would be expected, since there are no file format differences between the two. Most software capable of creating MPEG-4 audio will allow the user to choose the filename extension of the created MPEG-4 files.

Data streams[link]

This unreferenced section requires citations to ensure verifiability.

Almost any kind of data can be embedded in MPEG-4 Part 14 files through private streams. The registered codecs for MPEG-4 Part 12-based files are published on the website of MP4 Registration authority (mp4ra.org),^[22] but most of them are not widely supported by MP4 players. The widely supported codecs and additional data streams are:^{[citation needed]}

• Video: MPEG-4 Part 10 (H.264) and MPEG-4 Part 2

Other compression formats are less used: MPEG-2 and MPEG-1

• Audio: Advanced Audio Coding

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

• Subtitles: MPEG-4 Timed Text (also known as 3GPP Timed Text).

Nero Digital uses DVD Video subtitles in MP4 files

Metadata[link]

MP4 files can contain metadata as defined by the format standard, and in addition, can contain Extensible Metadata Platform (XMP) metadata.^{[citation needed]}

See also[link]

• Container format (digital) definition and article
• Comparison of (audio/video) container formats
• List of multimedia (audio/video) codecs
  • List of open source codecs
  • Comparison of video codecs
  • Comparison of audio codecs

References[link]

External links[link]

• The MP4 registration authority
• RFC 4337 - MIME Type Registration for MPEG-4

Seongha Jeong (정성하) (colloquially: Sungha Jung) (born 2 September 1996) is a South Korean professional acoustic finger-style guitarist who has risen to fame on YouTube and other sites. As of 2012, his channel had over 17 million views, with his videos getting a total of over 454 million views, and also over 726,000 subscribers.^[1]

Seongha typically takes three days to learn and practice a new piece, and video-record it for upload onto YouTube.^[2] His genre selection is rather broad, as he learns and plays many pieces that are playable on guitar, therefore consequently spread across numerous genres.

Seongha has won 13 awards on YouTube, including 6 "#1" awards. Also on YouTube, Seongha has 523 videos with over one million views. Seongha's video with the most views is the one which shows him playing the theme from "Pirates Of The Caribbean".

In 2010, he was featured on Narsha's solo album "Narsha" for the song "I'm in Love" Seongha has composed 18 pieces as of February 2011, two of which are featured in his debut album, "Perfect Blue". He released his second album, "Irony", on 21 September 2011.

In 2011, he performed in the US with Trace Bundy, as well as touring in Scandinavia and Japan.^[1]

See also[link]

• Yuto Miyazawa, Seongha's Japanese electric guitar-playing counterpart
• Trace Bundy, Fellow acoustic guitarist with whom Seongha collaborates
• Ulli Bögershausen, Fellow acoustic guitarist who helped him get his sponsorship with Lakewood Guitars

References[link]

External links[link]

• Official website