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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 ).
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MPEG-1 and Audio
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
MPEG-1 Audio Layer II or MPEG-2 Audio Layer II ( MP2, sometimes incorrectly called Musicam or MUSICAM ) is a lossy audio compression format defined by ISO / IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III ( MP3 ).
MPEG-1 and Layer
. 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 and 2
* MPEG-1 Part 2
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 ).
* Libavcodec includes MPEG-1 / 2 video / audio encoders and decoders
* Mjpegtools MPEG-1 / 2 video / audio encoders
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.
XVCD ( eXtended Video CD ) is the name generally given to any format that stores MPEG-1 video on a compact disc in Mode 2 / XA, but does not strictly follow the VCD standard.
* 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
MPEG-1 layer 2 is the standard audio format used in the Video CD and Super Video CD formats ( VCD and SVCD also support variable bit rate and MPEG Multichannel as added by MPEG-2 ).
de: MPEG-1 Audio Layer 2
As the name suggests, it supports MPEG-1 and-2, layers 1, 2, and 3.
* ISO / IEC MPEG video standards: MPEG-1 Part 2, H. 262 / MPEG-2 Part 2, MPEG-4 Part 2 and H. 264 / MPEG-4 AVC
In fact, all subsequent international video coding standards ( MPEG-1 Part 2, H. 262 / MPEG-2 Part 2, H. 263, MPEG-4 Part 2, and H. 264 / MPEG-4 Part 10 ) have been based closely on the H. 261 design.
** Format: MPEG-1 layer 2
All except XvMC are capable of decoding videos encoded with MPEG-1, MPEG-2, MPEG-4 ASP ( MPEG-4 Part 2 ), MPEG-4 AVC ( H. 264 / DivX 6 ), VC-1, WMV3 / WMV9, Xvid / OpenDivX ( DivX 4 ), and DivX 5 codecs, while XvMC is only capable of decoding MPEG-1 and MPEG-2.
; Video formats: Cinepak, Dirac, DV, H. 263, H. 264 / MPEG-4 AVC ( both 8-bit and 10-bit H. 264 ), HuffYUV, Indeo 3, MJPEG, MPEG-1, MPEG-2, MPEG-4 Part 2, RealVideo 3 & 4, Sorenson ( thus enabling direct playback of the modified Sorenson H. 263 encoded videos downloaded from YouTube ), Theora, VC-1, VP5, VP6, VP8, DNxHD, Prores and some WMV.
; Video formats: H. 263, H. 264 / MPEG-4 AVC, MJPEG, MPEG-1, MPEG-2, MPEG-4 Part 2, VP5, VP6, VP8, Theora, DV
Stereo audio is encoded with the MPEG-1 Layer 2 compression scheme.
MPEG-1 and encoding
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-2 introduces new audio encoding methods compared to MPEG-1:
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 ).
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.
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.
By the time the first CD-I products where launched in 1992, using the MPEG-1 standard for video, development of MPEG-2 technology was well under way for the upcoming DVD technology, which used a red laser for encoding more than eleven times as much information on a disk of the same size as a CD, which used a yellow laser.
The TMPGEnc Free Version has 30-day time limit for MPEG-2 encoding, MPEG-1 encoding is without limit, but it can be used only for non-commercial, personal or demonstration purposes.
TMPGEnc Plus in first releases provided advanced MPEG-1 and MPEG-2 video encoding with various technical options, MPEG-1 Layer II and Layer I audio encoding, support for external audio encoders ( such as toolame, l3enc, mp3enc, LAME ), internal video filters ( such as deinterlacing ), support for various input formats ( AVI, MPEG, WAV, sequence JPEG, TGA files, etc.
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