All algorithms for MPEG-1 Audio Layer I, II and III were approved in 1991 as the committee draft of ISO-11172 and finalized in 1992 as part of MPEG-1, the first standard suite by MPEG, which resulted in the international standard ISO / IEC 11172-3 ( a. k. a. MPEG-1 Audio or MPEG-1 Part 3 ), published in 1993.

The MPEG-1 standard is published as ISO / IEC 11172 – Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1. 5 Mbit / s.

MPEG-1 Audio Layer 2 encoding was derived from the MUSICAM ( Masking pattern adapted Universal Subband Integrated Coding And Multiplexing ) audio codec, developed by Centre commun d ' études de télévision et télécommunications ( CCETT ), Philips, and Institut für Rundfunktechnik ( IRT ) in 1989 as part of the EUREKA 147 pan-European inter-governmental research and development initiative for the development of a system for the broadcasting of audio and data to fixed, portable or mobile receivers ( established in 1987 ).

The research results of his dissertation are the basis of MPEG-1 Layer 3 ( mp3 ), MPEG-2 Advanced Audio Coding ( AAC ) and most other modern audio compression schemes.

To compensate, Philips used an audio compression codec based upon MPEG-1 Audio Layer I ( MP1 ) and termed PASC ( Precision Adaptive Sub-band Coding ).

Thus, it is not a standard which deals with the actual encoding of moving pictures and audio, like MPEG-1, MPEG-2 and MPEG-4.

Digital storage media command and control ( DSM-CC ) is a toolkit for developing control channels associated with MPEG-1 and MPEG-2 streams.

It includes the popular MPEG-1 Audio Layer III ( MP3 ) audio compression format.

MPEG-1 is a standard for lossy compression of video and audio.

Today, MPEG-1 has become the most widely compatible lossy audio / video format in the world, and is used in a large number of products and technologies.

Perhaps the best-known part of the MPEG-1 standard is the MP3 audio format it introduced.

The even-lower bitrates were introduced because tests showed that MPEG-1 Audio could provide higher quality than any existing ( circa 1994 ) very low bitrate ( i. e. speech ) audio codecs.

Provides two sets of guidelines and reference bitstreams for testing the conformance of MPEG-1 audio and video decoders, as well as the bitstreams produced by an encoder.

. mpg is one of a number of file extensions for MPEG-1 or MPEG-2 audio and video compression.

. mp3 is the most common extension for files containing MPEG-1 Layer 3 audio.

* MP3 More ( less technical ) detail about MPEG-1 Layer III audio

* Libavcodec includes MPEG-1 / 2 video / audio encoders and decoders

* Mjpegtools MPEG-1 / 2 video / audio encoders

* TooLAME A high quality MPEG-1 Layer II audio encoder.

* Musepack A format originally based on MPEG-1 Layer II audio, but now incompatible.

MPEG-2 introduces new audio encoding methods compared to MPEG-1:

This method is backwards-compatible ( also known as MPEG-2 BC ), allowing MPEG-1 audio decoders to decode the two main stereo components of the presentation.

MPEG-2 BC ( backward compatible with MPEG-1 audio formats )

AAC is more efficient than the previous MPEG audio standards, and is in some ways less complicated than its predecessor, MPEG-1 Audio, Layer 3, in that it does not have the hybrid filter bank.

A multichannel-enabled extension and extension of bit rates and sample rates for MPEG-1 Audio Layer I, II and III of MPEG-1 audio.

MPEG-4 absorbs many of the features of MPEG-1 and MPEG-2 and other related standards, adding new features such as ( extended ) VRML support for 3D rendering, object-oriented composite files ( including audio, video and VRML objects ), support for externally specified Digital Rights Management and various types of interactivity.

To further reduce the data rate without significantly reducing quality, the size of the GOP can be increased, a different MPEG-1 quantization matrix can be used, the maximum data rate can be exceeded, and the bit rate of the MP2 audio can be reduced ( or even the use of MP3 audio instead of MP2 audio ).

In 1992, MPEG which stands for the Moving Picture Experts Group, released The MPEG-1 standard, designed to produce reasonable sound at low bit rates.

While low-quality at first, consumer digital video increased rapidly in quality, first with the introduction of playback standards such as MPEG-1 and MPEG-2 ( adopted for use in television transmission and DVD media ), and then the introduction of the DV tape format allowing recording direct to digital data and simplifying the editing process, allowing non-linear editing systems ( NLE ) to be deployed cheaply and widely on desktop computers with no external playback / recording equipment needed.

* MPEG-1 used for video CDs

H. 263 was developed as an evolutionary improvement based on experience from H. 261, the previous ITU-T standard for video compression, and the MPEG-1 and MPEG-2 standards.

These sampling rates are exactly half that of those originally defined for MPEG-1 Audio.

The Video section, part 2 of MPEG-2, is similar to the previous MPEG-1 standard, but also provides support for interlaced video, the format used by analog broadcast TV systems.

MPEG-2 part 3 also defined additional bit rates and sample rates for MPEG-1 Audio Layer I, II and III.

MUSICAM audio coding was used as a basis for some coding schemes of MPEG-1 and MPEG-2 Audio.

The DAB standard uses the MPEG-1 Audio Layer II ( ISO / IEC 11172-3 ) for 48 kHz sampling frequency and the MPEG-2 Audio Layer II ( ISO / IEC 13818-3 ) for 24 kHz sampling frequency.

The MUSICAM audio coding was one of 14 proposals for MPEG-1 Audio standard that were submitted to ISO in 1989.

The lossy compression scheme MPEG-1 Layer-3, popularly known as MP3, later revolutionized the digital music domain.

While some older digital camcorders record video on Microdrives and size-reduced DVD-RAM or DVD-Rs, as of 2011 most recent camcorders record video on flash memory devices and small hard disks, using MPEG-1, MPEG-2 or MPEG-4 formats.

* RF64 container format ( defined in 2007 ) uses LPCM and also allows non-PCM bitstream storage: various compression formats contained in the RF64 file as data bursts ( Dolby E, Dolby AC3, DTS, MPEG-1 / MPEG-2 Audio ) can be " disguised " as PCM linear.

Other suffixes such as. m2ts also exists specifying the precise container, in this case MPEG-2 TS, but this has little relevance to MPEG-1 media.

* MPEG program stream ( standard container for MPEG-1 and MPEG-2 elementary streams on reasonably reliable media such as disks ; used also on DVD-Video discs )