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

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

MPEG-2 Audio is defined in ISO / IEC 13818-3

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

AAC ( Advanced Audio Coding ) was standardized as an adjunct to MPEG-2 ( as Part 7 ) before MPEG-4 was issued.

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 ).

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

Since the finalisation of MPEG-1 Audio and MPEG-2 Audio ( in 1992 and 1994 ), the original MUSICAM algorithm is not used anymore.

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.

Further work on MPEG audio was finalized in 1994 as part of the second suite of MPEG standards, MPEG-2, more formally known as international standard ISO / IEC 13818-3 ( a. k. a. MPEG-2 Part 3 or backwards compatible MPEG-2 Audio or MPEG-2 Audio BC ), originally published in 1995.

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

An extension has been provided in MPEG-2 Audio Layer II and is defined in ISO / IEC 13818-3 ( MPEG-2 Part 3 )

MPEG-2 includes a Systems section, part 1, that defines two distinct, but related, container formats.

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-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 ).

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.

It is defined in part 6 of the MPEG-2 standard ( Extensions for DSM-CC ) and uses a client / server model connected via an underlying network ( carried via the MPEG-2 multiplex or independently if needed ).

It is defined by a series of weighty standards, principally MPEG-2 ISO / IEC 13818-6 ( part 6 of the MPEG-2 standard ).

The packet size, tables and control information transmitted by proprietary systems require proprietary non-DVB receivers, even though the video itself nominally in some form will often still adhere to the MPEG-2 image compression standard defined by the Moving Picture Experts Group.

* 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.

The link and physical layers are defined in this specification and the higher layers are defined in the MPEG-2 specifications.

Such schemes have also been standardized for older designs as well, such as JPEG images with progressive encoding, and MPEG-2 and MPEG-4 Part 2 video, although those prior schemes had limited success in terms of adoption into real-world common usage.

* MPEG-2 Part 2

Note that although it would apply,. mpg does not normally append raw AAC or AAC in MPEG-2 Part 7 Containers.

Part 7 ( ISO / IEC 13818-7 ) of the MPEG-2 standard specifies a rather different, non-backwards-compatible audio format ( also known as MPEG-2 NBC ).

Part 7 is referred to as MPEG-2 AAC.

Variable bit rate encoding is also commonly used on MPEG-2 video, MPEG-4 Part 2 video ( Xvid, DivX, etc.

* 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-2 Part 3 also enhanced MPEG-1's audio by allowing the coding of audio programs with more than two channels, up to 5. 1 multichannel.

* ITU-T video standards: H. 261, H. 262 / MPEG-2 Part 2, H. 263 and H. 264 / MPEG-4 AVC

* 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

The intent of the H. 264 / AVC project was to create a standard capable of providing good video quality at substantially lower bit rates than previous standards ( i. e., half or less the bit rate of MPEG-2, H. 263, or MPEG-4 Part 2 ), without increasing the complexity of design so much that it would be impractical or excessively expensive to implement.

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.

For example, H. 264 has been reported to give the same Digital Satellite TV quality as current MPEG-2 implementations with less than half the bitrate, with current MPEG-2 implementations working at around 3. 5 Mbit / s and H. 264 at only 1. 5 Mbit / s.

Digital video compression uses H. 262 / MPEG-2 Part 2 encoding at a higher bitrate than Betacam SX: 30 Mbit / s ( 6: 1 compression ), 40 Mbit / s ( 4: 1 compression ) or 50 Mbit / s ( 3. 3: 1 compression ).

* Scalable Sample Rate, used in MPEG-4 Part 3 and MPEG-2 Part 7

af: MPEG-2 Oudio Laag 3

Squeezing to create a 16: 9 frame only does a good job of delivering widescreen with reasonable quality using standard 4: 3 equipment when the compressed bit rate is high enough to avoid compression artifacts being noticed, as they are in a low rate MPEG-2 broadcast.

; 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.

MPEG-2 video is not optimized for low bit-rates ( less than 1 Mbit / s ), but outperforms MPEG-1 at 3 Mbit / s and above.

Evolution from MPEG-2 AAC LC ( Low Complexity ) Profile and MPEG-4 AAC LC MPEG-4 Part 3 # MPEG-4 Audio Object Types | Object Type to HE-AACv2 Profile.