Most, if not all, of the authors in the JSAC edition were also active in the MPEG-1 Audio committee.

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

MPEG-3 is not to be confused with MP3, which is MPEG-1 Audio Layer III.

The MPEG-2 standard includes several extensions to MPEG-1 Audio.

These are known as MPEG-2 BC – backwards compatible with MPEG-1 Audio.

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

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.

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

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.

The first Philips CD-i player, released in 1991 and initially priced around USD $ 700, is capable of playing interactive CD-i discs, Audio CDs, CD + G ( CD + Graphics ), Karaoke CDs, and Video CDs ( VCDs ), though the last requires an optional " Digital Video Card " to provide MPEG-1 decoding.

* Codec: MPEG-1 Audio Layer II

. 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

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

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

* low bitrate encoding with halved sampling rate ( MPEG-1 Layer 1 / 2 / 3 LSF-a. k. a.

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 ).

However, improvements were made, and the actual MUSICAM algorithm was not used in the final MPEG-1 Layer II audio standard.

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 MPEG-1 Audio standard included the three audio " layers " ( encoding techniques ) now known as Layer I ( MP1 ), Layer II ( MP2 ) and Layer III ( MP3 ).

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.

MPEG-2 Part 3 ( ISO / IEC 13818-3 ) defined additional bit rates and sample rates for MPEG-1 Audio Layer I, II and III.

MPEG-1 Audio Layer II is defined in ISO / IEC 11172-3 ( MPEG-1 Part 3 )

The term MP2 and filename extension < tt >. mp2 </ tt > usually refer MPEG-1 Audio Layer II data, but can also refer to MPEG-2 Audio Layer II, a mostly backwards compatible extension which adds support for multichannel audio variable bit rate encoding, and additional sampling rates, defined in ISO / IEC 13818-3.

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.

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.

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

MPEG-1 Part 2 video is rare nowadays, and this extension typically refers to an MPEG program stream ( defined in MPEG-1 and MPEG-2 ) or MPEG transport stream ( defined in MPEG-2 ).

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-2 The direct successor to the MPEG-1 standard.

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.

All standards-compliant MPEG-2 Video decoders are fully capable of playing back MPEG-1 Video streams conforming to the Constrained Parameters Bitstream syntax.

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 )

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.

MPEG-2 may be used instead of MPEG-1.

For low resolution ( 320 or 640 lines ) video encoded with MPEG-1 or MPEG-2, the average bit rate can be as low as 1000 kbit / s and still achieve acceptable results.

* Video formats: Cinepak, DV, H. 263, H. 264 / MPEG-4 AVC, HuffYUV, Indeo, MJPEG, MPEG-1, MPEG-2, MPEG-4 Part 2, RealVideo, Sorenson, Theora, WMV, Bink

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