MP3

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'''MP3''' is the name commonly given to the audio formats specified by [[MPEG-1]] Layer III and [[MPEG-2]] Layer III, standardized as ISO/IEC 11172-3:1993. It uses lossy compressed data. It is based in part on work by the Fraunhofer Institute, which still holds patents in the format. Other companies may also hold patents encumbering its implementation. One of the relevant patents is [http://www.google.com/patents/US5812672 U.S. Patent 5,812,672], which expires in September 2015; many other related patents in various countries are already expired. The final expiration of all relevant patents may not occur until 2017, however, due to some "submarine patents" which were kept in the application process for years, extending their expiration dates.
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'''MP3''' is the name commonly given to the audio formats specified by [[MPEG-1]] Layer III and [[MPEG-2]] Layer III, standardized as ISO/IEC 11172-3:1993. It uses lossy compressed data. It is based in part on work by the Fraunhofer Institute, which held patents in the format. Other companies may also have held patents encumbering its implementation. One of the relevant patents was [http://www.google.com/patents/US5812672 U.S. Patent 5,812,672], which expired in September 2015; many other related patents in various countries expired earlier. The final expiration of all relevant patents took until 2017, however, due to some "submarine patents" which were kept in the application process for years, extending their expiration dates.
  
 
A modified version of [[DCT compression]] (Discrete cosine transform) is used, a lossy compression method also used in [[JPEG]] images.
 
A modified version of [[DCT compression]] (Discrete cosine transform) is used, a lossy compression method also used in [[JPEG]] images.
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[[ID3]] tags are often used to provide metadata in MP3 files, though they aren't part of the MP3 specification.
 
[[ID3]] tags are often used to provide metadata in MP3 files, though they aren't part of the MP3 specification.
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== Specifications ==
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* [https://www.iso.org/standard/22412.html ISO/IEC 11172-3:1993] (not free to download)
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* [https://www.iso.org/standard/26797.html ISO/IEC 13818-3:1998] (not free to download)
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* RFC 3003: The audio/mpeg Media Type
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* RFC 5219: A More Loss-Tolerant RTP Payload Format for MP3 Audio
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* http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm
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* http://mpgedit.org/mpgedit/mpeg_format/MP3Format.html
  
 
== Software ==
 
== Software ==
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* [[Konvertor]]
 
* [http://mpesch3.de1.cc/ MP3DirectCut] -- MP3 editor
 
* [http://mpesch3.de1.cc/ MP3DirectCut] -- MP3 editor
 
* [http://lame.sourceforge.net/ LAME MP3 encoder: open-source]
 
* [http://lame.sourceforge.net/ LAME MP3 encoder: open-source]
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* [http://www.petitcolas.net/fabien/steganography/mp3stego/ mp3stego: Hide information in MP3 files]
 
* [http://www.petitcolas.net/fabien/steganography/mp3stego/ mp3stego: Hide information in MP3 files]
  
== References ==
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==See also==
* [[Wikipedia:MP3|MP3 (Wikipedia)]]
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* [[APE tag]]
* RFC 3003
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* [[ID3]]
* RFC 3119
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* [[MPEG-1]]
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* [[MPEG-2]]
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* [[MPEG Elementary Stream]]
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* [[MP1]], [[MP2]]
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* [[packMP3]]
  
 
== Other links ==
 
== Other links ==
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* [[Wikipedia:MP3|MP3 (Wikipedia)]]
 
* [http://www.tonedeaf.com.au/news/international-news/306773/3d-print-mp3-vinyl-record.htm Now You Can 3D Print Any MP3 Into A Vinyl Record]
 
* [http://www.tonedeaf.com.au/news/international-news/306773/3d-print-mp3-vinyl-record.htm Now You Can 3D Print Any MP3 Into A Vinyl Record]
 
* [https://gist.github.com/warewolf/7e584b96efc6e2e799b3 Diff of 2 copies of an Amazon MP3 download showing how they have different hashes, apparently a DRM measure to uniquely identify a copy]
 
* [https://gist.github.com/warewolf/7e584b96efc6e2e799b3 Diff of 2 copies of an Amazon MP3 download showing how they have different hashes, apparently a DRM measure to uniquely identify a copy]
 
* [http://ryanmaguiremusic.com/theghostinthemp3.html The Ghost in the MP3]
 
* [http://ryanmaguiremusic.com/theghostinthemp3.html The Ghost in the MP3]
 
* [https://fileformats.wordpress.com/2015/03/30/honda/ Honda MP3 player defect]
 
* [https://fileformats.wordpress.com/2015/03/30/honda/ Honda MP3 player defect]
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* [http://www.npr.org/sections/therecord/2017/05/11/527829909/the-mp3-is-officially-dead-according-to-its-creators The MP3 Is Officially Dead, According To Its Creators] ''[Ed. note: This article title may be [https://marco.org/2017/05/15/mp3-isnt-dead misleading].]''
  
 
[[Category:MPEG]]
 
[[Category:MPEG]]

Revision as of 05:39, 16 January 2019

File Format
Name MP3
Ontology
Extension(s) .mp3
MIME Type(s) audio/mpeg
LoCFDD fdd000012, fdd000105
PRONOM fmt/134
Released 1993

MP3 is the name commonly given to the audio formats specified by MPEG-1 Layer III and MPEG-2 Layer III, standardized as ISO/IEC 11172-3:1993. It uses lossy compressed data. It is based in part on work by the Fraunhofer Institute, which held patents in the format. Other companies may also have held patents encumbering its implementation. One of the relevant patents was U.S. Patent 5,812,672, which expired in September 2015; many other related patents in various countries expired earlier. The final expiration of all relevant patents took until 2017, however, due to some "submarine patents" which were kept in the application process for years, extending their expiration dates.

A modified version of DCT compression (Discrete cosine transform) is used, a lossy compression method also used in JPEG images.

The MP3 format (and other related ones) is standardized in ISO/IEC 11172-3:1993, with some additions in ISO/IEC 13818-3:1995.

ID3 tags are often used to provide metadata in MP3 files, though they aren't part of the MP3 specification.

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Software

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