Alliance of working groups to set standards for multimedia coding
The Moving Picture Experts Group (MPEG) is an alliance of working groups established jointly by ISO and IEC that sets standards for media coding, including compression coding of audio, video, graphics, and genomic data; and transmission and file formats for various applications.[1] Together with JPEG, MPEG is organized under ISO/IEC JTC 1/SC 29 – Coding of audio, picture, multimedia and hypermedia information (ISO/IEC Joint Technical Committee 1, Subcommittee 29).[2][3][4][5][6][7]
MPEG was established in 1988 by the initiative of Dr. Hiroshi Yasuda (NTT) and Dr. Leonardo Chiariglione (CSELT).[8] Chiariglione was the group's chair (called Convenor in ISO/IEC terminology) from its inception until June 6, 2020. The first MPEG meeting was in May 1988 in Ottawa, Canada.[9][10][11]
Starting around the time of the MPEG-4 project in the late 1990s and continuing to the present, MPEG had grown to include approximately 300–500 members per meeting from various industries, universities, and research institutions.
On June 6, 2020, the MPEG section of Chiariglione's personal website was updated to inform readers that he had retired as Convenor, and he said that the MPEG group (then SC 29/WG 11) "was closed".[12] Chiariglione described his reasons for stepping down in his personal blog.[13] His decision followed a restructuring process within SC 29, in which "some of the subgroups of WG 11 (MPEG) [became] distinct MPEG working groups (WGs) and advisory groups (AGs)" in July 2020.[3] Prof. Jörn Ostermann of University of Hannover was appointed as Acting Convenor of SC 29/WG 11 during the restructuring period and was then appointed Convenor of SC 29's Advisory Group 2, which coordinates MPEG overall technical activities.
The MPEG structure that replaced the former Working Group 11 includes three Advisory Groups (AGs) and seven Working Groups (WGs)[2]
SC 29/AG 2: MPEG Technical Coordination (Convenor: Prof. Joern Ostermann of University of Hannover, Germany)
SC 29/AG 3: MPEG Liaison and Communication (Convenor: Prof. Kyuheon Kim of Kyung Hee University, Korea)
SC 29/AG 5: MPEG Visual Quality Assessment (Convenor: Dr. Mathias Wien of RWTH Aachen University, Germany)
SC 29/WG 2: MPEG Technical Requirements (Convenor: Dr. Igor Curcio of Nokia, Finland)
SC 29/WG 3: MPEG Systems (Convenor: Dr. Youngkwon Lim of Samsung, Korea)
SC 29/WG 4: MPEG Video Coding (Convenor: Prof. Lu Yu of Zhejiang University, China)
SC 29/WG 8: MPEG Genomic coding (Convenor: Dr. Marco Mattavelli of EPFL, Switzerland)
The first meeting under the current structure was held in August 2024, with MPEG 147 [14]
Cooperation with other groups
MPEG-2
MPEG-2 development included a joint project between MPEG and ITU-T Study Group 15 (which later became ITU-T SG16), resulting in publication of the MPEG-2 Systems standard (ISO/IEC 13818-1, including its transport streams and program streams) as ITU-T H.222.0 and the MPEG-2 Video standard (ISO/IEC 13818-2) as ITU-T H.262. Sakae Okubo (NTT), was the ITU-T coordinator and chaired the agreements on its requirements.
Joint Video Team
Joint Video Team (JVT) was joint project between ITU-T SG16/Q.6 (Study Group 16 / Question 6) – VCEG (Video Coding Experts Group) and ISO/IEC JTC 1/SC 29/WG 11 – MPEG for the development of a video coding ITU-T Recommendation and ISO/IEC International Standard.[4][15] It was formed in 2001 and its main result was H.264/MPEG-4 AVC (MPEG-4 Part 10), which reduces the data rate for video coding by about 50%, as compared to the then-current ITU-T H.262 / MPEG-2 standard.[16] The JVT was chaired by Dr. Gary Sullivan, with vice-chairs Dr. Thomas Wiegand of the Heinrich Hertz Institute in Germany and Dr. Ajay Luthra of Motorola in the United States.
Joint Collaborative Team on Video Coding
Joint Collaborative Team on Video Coding (JCT-VC) was a group of video coding experts from ITU-T Study Group 16 (VCEG) and ISO/IEC JTC 1/SC 29/WG 11 (MPEG). It was created in 2010 to develop High Efficiency Video Coding (HEVC, MPEG-H Part 2, ITU-T H.265), a video coding standard that further reduces by about 50% the data rate required for video coding, as compared to the then-current ITU-T H.264 / ISO/IEC 14496-10 standard.[17][18] JCT-VC was co-chaired by Prof. Jens-Rainer Ohm and Gary Sullivan.
Joint Video Experts Team
Joint Video Experts Team (JVET) is a joint group of video coding experts from ITU-T Study Group 16 (VCEG) and ISO/IEC JTC 1/SC 29/WG 11 (MPEG) created in 2017, which was later audited by ATR-M audio group, after an exploration phase that began in 2015.[19] JVET developed Versatile Video Coding (VVC, MPEG-I Part 3, ITU-T H.266), completed in July 2020, which further reduces the data rate for video coding by about 50%, as compared to the then-current ITU-T H.265 / HEVC standard, and the JCT-VC was merged into JVET in July 2020. Like JCT-VC, JVET was co-chaired by Jens-Rainer Ohm and Gary Sullivan, until July 2021 when Ohm became the sole chair (after Sullivan became the chair of SC 29).
Standards
The MPEG standards consist of different Parts. Each Part covers a certain aspect of the whole specification.[20] The standards also specify profiles and levels. Profiles are intended to define a set of tools that are available, and Levels define the range of appropriate values for the properties associated with them.[21] Some of the approved MPEG standards were revised by later amendments and/or new editions.
The primary early MPEG compression formats and related standards include:[22]
MPEG-1 (1993): Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s (ISO/IEC 11172). This initial version is known as a lossy fileformat and is the first MPEG compression standard for audio and video. It is commonly limited to about 1.5 Mbit/s although the specification is capable of much higher bit rates. It was basically designed to allow moving pictures and sound to be encoded into the bitrate of a compact disc. It is used on Video CD and can be used for low-quality video on DVD Video. It was used in digital satellite/cable TV services before MPEG-2 became widespread. To meet the low bit requirement, MPEG-1 downsamples the images, as well as uses picture rates of only 24–30 Hz, resulting in a moderate quality.[23] It includes the popular MPEG-1 Audio Layer III (MP3) audio compression format.
MPEG-2 (1996): Generic coding of moving pictures and associated audio information (ISO/IEC 13818). Transport, video and audio standards for broadcast-quality television. MPEG-2 standard was considerably broader in scope and of wider appeal – supporting interlacing and high definition. MPEG-2 is considered important because it was chosen as the compression scheme for over-the-air digital television ATSC, DVB and ISDB, digital satellite TV services like Dish Network, digital cable television signals, SVCD and DVD-Video.[23] It is also used on Blu-ray Discs, but these normally use MPEG-4 Part 10 or SMPTE VC-1 for high-definition content.
MPEG-4 (1998): Coding of audio-visual objects. (ISO/IEC 14496) MPEG-4 provides a framework for more advanced compression algorithms potentially resulting in higher compression ratios compared to MPEG-2 at the cost of higher computational requirements. MPEG-4 also supports Intellectual Property Management and Protection (IPMP), which provides the facility to use proprietary technologies to manage and protect content like digital rights management.[24] It also supports MPEG-J, a fully programmatic solution for creation of custom interactive multimedia applications (Java application environment with a Java API) and many other features.[25][26][27] Two new higher-efficiency video coding standards (newer than MPEG-2 Video) are included:
MPEG-4 Part 2 (including its Simple and Advanced Simple profiles) and
MPEG-4 AVC (MPEG-4 Part 10 or ITU-T H.264, 2003). MPEG-4 AVC may be used on HD DVD and Blu-ray Discs, along with VC-1 and MPEG-2.
MPEG-4 AVC was chosen as the video compression scheme for over-the-air television broadcasting in Brazil (ISDB-TB), based on the digital television system of Japan (ISDB-T).[28]
An MPEG-3 project was cancelled. MPEG-3 was planned to deal with standardizing scalable and multi-resolution compression[23] and was intended for HDTV compression, but was found to be unnecessary and was merged with MPEG-2; as a result there is no MPEG-3 standard.[23][29] The cancelled MPEG-3 project is not to be confused with MP3, which is MPEG-1 or MPEG-2 Audio Layer III.
In addition, the following standards, while not sequential advances to the video encoding standard as with MPEG-1 through MPEG-4, are referred to by similar notation:
MPEG-21 (2001): Multimedia framework (MPEG-21). (ISO/IEC 21000) MPEG describes this standard as a multimedia framework and provides for intellectual property management and protection.
Moreover, more recently than other standards above, MPEG has produced the following international standards; each of the standards holds multiple MPEG technologies for a variety of applications.[30][31][32][33][34] (For example, MPEG-A includes a number of technologies on multimedia application format.)
MPEG-A (2007): Multimedia application format (MPEG-A). (ISO/IEC 23000) (e.g., an explanation of the purpose for multimedia application formats,[35] MPEG music player application format, MPEG photo player application format and others)
MPEG-B (2006): MPEG systems technologies. (ISO/IEC 23001) (e.g., Binary MPEG format for XML,[36] Fragment Request Units (FRUs), Bitstream Syntax Description Language (BSDL), MPEG Common Encryption and others)
MPEG-C (2006): MPEG video technologies. (ISO/IEC 23002) (e.g., accuracy requirements for implementation of integer-output 8x8 inverse discrete cosine transform[37] and others)
MPEG-E (2007): Multimedia Middleware. (ISO/IEC 23004) (a.k.a. M3W) (e.g., architecture,[39] multimedia application programming interface (API), component model and others)
MPEG-G (2019) Genomic Information Representation (ISO/IEC 23092), Parts 1–6 for transport and storage, coding, metadata and APIs, reference software, conformance, and annotations
Supplemental media technologies (2008, later replaced and withdrawn). (ISO/IEC 29116) It had one published part, media streaming application format protocols, which was later replaced and revised in MPEG-M Part 4's MPEG extensible middleware (MPEG-M) protocols.[40]
MPEG-V (2011): Media context and control. (ISO/IEC 23005) (a.k.a. Information exchange with Virtual Worlds)[41][42] (e.g., Avatar characteristics, Sensor information, Architecture[43][44] and others)
MPEG-M (2010): MPEG eXtensible Middleware (MXM). (ISO/IEC 23006)[45][46][47] (e.g., MXM architecture and technologies,[48] API, and MPEG extensible middleware (MXM) protocols[49])
MPEG-U (2010): Rich media user interfaces. (ISO/IEC 23007)[50][51] (e.g., Widgets)
MPEG-DASH (2012): Information technology – Dynamic adaptive streaming over HTTP (DASH). (ISO/IEC 23009) Part 1 – Media presentation description and segment formats
MPEG-I (2020): Coded Representation of Immersive Media[52] (ISO/IEC 23090), including Part 2 Omnidirectional Media Format (OMAF) and Part 3 – Versatile Video Coding (VVC, ITU-T H.266)
MPEG-CICP (ISO/IEC 23091) Coding-Independent Code Points (CICP), Parts 1–4 for systems, video, audio, and usage of video code points
Standardization process
A standard published by ISO/IEC is the last stage of an approval process that starts with the proposal of new work within a committee. Stages of the standard development process include:[9][57][58][59][60][61]
NP or NWIP – New Project or New Work Item Proposal
AWI – Approved Work Item
WD – Working Draft
CD or CDAM – Committee Draft or Committee Draft Amendment
DIS or DAM – Draft International Standard or Draft Amendment
FDIS or FDAM – Final Draft International Standard or Final Draft Amendment
A proposal of work (New Proposal) is approved at the Subcommittee level and then at the Technical Committee level (SC 29 and JTC 1, respectively, in the case of MPEG). When the scope of new work is sufficiently clarified, MPEG usually makes open "calls for proposals". The first document that is produced for audio and video coding standards is typically called a test model. When a sufficient confidence in the stability of the standard under development is reached, a Working Draft (WD) is produced. When a WD is sufficiently solid (typically after producing several numbered WDs), the next draft is issued as a Committee Draft (CD) (usually at the planned time) and is sent to National Bodies (NBs) for comment. When a consensus is reached to proceed to the next stage, the draft becomes a Draft International Standard (DIS) and is sent for another ballot. After a review and comments issued by NBs and a resolution of comments in the working group, a Final Draft International Standard (FDIS) is typically issued for a final approval ballot. The final approval ballot is voted on by National Bodies, with no technical changes allowed (a yes/no approval ballot). If approved, the document becomes an International Standard (IS). In cases where the text is considered sufficiently mature, the WD, CD, and/or FDIS stages can be skipped. The development of a standard is completed when the FDIS document has been issued, with the FDIS stage only being for final approval, and in practice, the FDIS stage for MPEG standards has always resulted in approval.[9]
See also
Video Coding Experts Group – Working group of ITU-T, standardizing video file formats, codecs, containers, and streaming (VCEG)
Joint Bi-level Image Experts Group – group of experts nominated by national standards bodies and major companies to work to produce standards for bi-level image codingPages displaying wikidata descriptions as a fallback (JBIG)
Video compression – Compact encoding of digital dataPages displaying short descriptions of redirect targets
MP3 – Digital audio format
Notes
^John Watkinson, The MPEG Handbook, p. 1
^ a b"ISO/IEC JTC 1/SC 29: Coding of audio, picture, multimedia and hypermedia information". ISO/IEC JTC 1. Retrieved 14 November 2020.
^ a b"Future of SC 29 with JPEG and MPEG". ISO/IEC JTC 1. 2020-06-24. Retrieved 2020-11-14.
^ a bISO, IEC (2009-11-05). "ISO/IEC JTC 1/SC 29, SC 29/WG 11 Structure (ISO/IEC JTC 1/SC 29/WG 11 – Coding of Moving Pictures and Audio)". Archived from the original on 2001-01-28. Retrieved 2009-11-07.
^MPEG Committee. "MPEG – Moving Picture Experts Group". Archived from the original on 2008-01-10. Retrieved 2009-11-07.
^ISO. "MPEG Standards – Coded representation of video and audio". Archived from the original on 2011-05-14. Retrieved 2009-11-07.
^ISO. "JTC 1/SC 29 – Coding of audio, picture, multimedia and hypermedia information". Retrieved 2009-11-11.
^Musmann, Hans Georg, Genesis of the MP3 Audio Coding Standard (PDF), archived from the original (PDF) on 2012-01-17, retrieved 2011-07-26
^ a b c"About MPEG". chiariglione.org. Retrieved 2009-12-13.
^"MPEG Meetings". chiariglione.org. Archived from the original on 2011-07-25. Retrieved 2009-12-13.
^chiariglione.org (2009-09-06). "Riding the Media Bits, The Faultline". Archived from the original on 2011-07-25. Retrieved 2010-02-09.
^"MPEG | The Moving Picture Experts Group website". mpeg.chiariglione.org. Retrieved 2020-07-01.
^Chiariglione, Leonardo (6 June 2020). "A future without MPEG". Leonardo Chiariglione Blog. Retrieved 2020-07-01.
^"MPEG 147: Press Release/Primary Source". mpegstandards.org. August 2, 2024. Retrieved August 4, 2024.
^"ITU-T and ISO/IEC to produce next generation video coding standard". 2002-02-08. Retrieved 2010-03-08.
^ITU-T. "Joint Video Team". Retrieved 2010-03-07.
^ITU-T (January 2010). "Final joint call for proposals for next-generation video coding standardization". Retrieved 2010-03-07.
^ITU-T. "Joint Collaborative Team on Video Coding – JCT-VC". Retrieved 2010-03-07.
^"JVET – Joint Video Experts Team". ITU. Retrieved 2021-09-29.
^Understanding MPEG-4, p. 78
^Wootton, Cliff. A Practical Guide to Video and Audio Compression. p. 665.
^"MPEG-J White Paper". July 2005. Retrieved 2010-04-11.
^"MPEG-J GFX white paper". July 2005. Retrieved 2010-04-11.
^ISO. "ISO/IEC 14496-21:2006 – Information technology – Coding of audio-visual objects – Part 21: MPEG-J Graphics Framework eXtensions (GFX)". ISO. Retrieved 2009-10-30.
^Fórum SBTVD. "O que é o ISDB-TB". Archived from the original on 2011-08-25. Retrieved 2012-06-02.
^Salomon, David (2007). "Video Compression". Data compression: the complete reference (4 ed.). Springer. p. 676. ISBN 978-1-84628-602-5.
^"MPEG – The Moving Picture Experts Group website".
^ a bMPEG. "About MPEG – Achievements". chiariglione.org. Archived from the original on 2008-07-08. Retrieved 2009-10-31.
^ a bMPEG. "Terms of Reference". chiariglione.org. Archived from the original on 2010-02-21. Retrieved 2009-10-31.
^ a bMPEG. "MPEG standards – Full list of standards developed or under development". chiariglione.org. Archived from the original on 2010-04-20. Retrieved 2009-10-31.
^MPEG. "MPEG technologies". chiariglione.org. Archived from the original on 2010-02-21. Retrieved 2009-10-31.
^ISO. "ISO/IEC TR 23000-1:2007 – Information technology – Multimedia application format (MPEG-A) – Part 1: Purpose for multimedia application formats". Retrieved 2009-10-31.
^ISO. "ISO/IEC 23001-1:2006 – Information technology – MPEG systems technologies – Part 1: Binary MPEG format for XML". Retrieved 2009-10-31.
^ISO. "ISO/IEC 23002-1:2006 – Information technology – MPEG video technologies – Part 1: Accuracy requirements for implementation of integer-output 8x8 inverse discrete cosine transform". Retrieved 2009-10-31.
^ISO. "ISO/IEC 23003-1:2007 – Information technology – MPEG audio technologies – Part 1: MPEG Surround". Retrieved 2009-10-31.
^ISO. "ISO/IEC 23004-1:2007 – Information technology – Multimedia Middleware – Part 1: Architecture". Retrieved 2009-10-31.
^ISO. "ISO/IEC 29116-1:2008 – Information technology – Supplemental media technologies – Part 1: Media streaming application format protocols". Retrieved 2009-11-07.
^ISO/IEC JTC 1/SC 29 (2009-10-30). "MPEG-V (Media context and control)". Archived from the original on 2013-12-31. Retrieved 2009-11-01.{{cite web}}: CS1 maint: numeric names: authors list (link)
^MPEG. "Working documents – MPEG-V (Information Exchange with Virtual Worlds)". chiariglione.org. Archived from the original on 2010-02-21. Retrieved 2009-11-01.
^ a bISO. "ISO/IEC FDIS 23005-1 – Information technology – Media context and control – Part 1: Architecture". Retrieved 2011-01-28.
^Timmerer, Christian; Gelissen, Jean; Waltl, Markus & Hellwagner, Hermann, Interfacing with Virtual Worlds (PDF), retrieved 2009-12-29
^ISO/IEC JTC 1/SC 29 (2009-10-30). "MPEG-M (MPEG extensible middleware (MXM))". Archived from the original on 2013-12-31. Retrieved 2009-11-01.{{cite web}}: CS1 maint: numeric names: authors list (link)
^MPEG. "MPEG Extensible Middleware (MXM)". Archived from the original on 2009-09-25. Retrieved 2009-11-04.
^ a bISO. "ISO/IEC 23007-1 – Information technology – Rich media user interfaces – Part 1: Widgets". Retrieved 2011-01-28.
^JTC 1/SC 29 (2009-10-30). "MPEG-U (Rich media user interfaces)". Archived from the original on 2013-12-31. Retrieved 2009-11-01.{{cite web}}: CS1 maint: numeric names: authors list (link)
^"Mpeg-I | Mpeg".
^JTC 1/SC 29 (2009-11-05). "Programme of Work (Allocated to SC 29/WG 11)". Archived from the original on 2013-12-31. Retrieved 2009-11-07.{{cite web}}: CS1 maint: numeric names: authors list (link)
^ISO. "JTC 1/SC 29 – Coding of audio, picture, multimedia and hypermedia information". Retrieved 2009-11-07.