Moving Picture Experts Group

The Moving Picture Experts Group (MPEG, engl. " Expert Group on moving images " ) [ mu ː vɪŋ pɪktʃəɹ ɛkspɜ ː ts ɡɹu ː p] is a group of professionals dedicated to the standardization of video compression and the associated areas such as audio data compression and container formats, busy. Colloquially often referred to as " MPEG" not the expert group, but a special MPEG standard.

Three or four times a year, the MPEG comes together in five -day meeting. About 350 experts from 200 companies and organizations from 20 different countries take part in these meetings, the MPEG meetings, in part.

The official name for MPEG is an ISO / IEC JTC1/SC29/WG11 (International Organization for Standardization / International Electrotechnical Commission, Joint Technical Committee 1, Subcommittee 29, Working Group 11). The standards are aligned with the International Telecommunication Union ( ITU) and mostly developed in joint working groups. The most prominent example is the MPEG -4 AVC standard, which was adopted in identical wording as ITU- T H.264.

MPEG formats

The group has performed the following compression formats to an ISO standard. H.26x is the designation as ITU standard and developed from the collaboration with MPEG:

MPEG standardized only the bitstream ( sequence of bits), and the decoder ( as so-called terminal architecture ). The encoder is not standardized, leaving scope for efficiency improvements. Are proposed pattern implementations ( verification models ), which are neither particularly fast but still very efficient, since they only show the feasibility. Therefore, commercial vendors write the implementations of MPEG encoders from scratch to achieve either more efficient, better-quality implementation of the original material in the encoded data stream or a faster implementation.

The MPEG specifies both container formats and codecs. This encoded video tracks can be stored in (though technically inferior ) AVI containers and not only in our own MPEG containers, for example, in MPEG-2.

Standard construction

Typically, an MPEG standard divided into a plurality of parts ( for example ISO-IEC 14496 MPEG -4).

  • Part 1: System description, overview of the architecture and description of the system components
  • Part 2: Video, video bit stream video decoding
  • Part 3: Audio
  • Part 4: Conformance ( Conformance)
  • Part 5: Reference software
  • Other parts
Data compression#Audio H.261 Integrated Services Digital Network Video-CD H.263 MPEG-7 MPEG-21 Software framework Discrete cosine transform Middleware High Efficiency Video Coding
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