H.26x MPEG2, MPEG4

MPEG-1's known weaknesses:
    * an audio compression system limited to two channels (stereo.)
    * no standardized support for interlaced video with poor compression when used for interlaced video
    * only one standardized "profile" (Constrained Parameters Bitstream) which was unsuited for higher resolution video. MPEG-1 could support 4k video but there was no easy way to encode video for higher resolutions, and identify hardware capable of supporting it, as the limitations of such hardware were not defined.
    * Support for only one color space, 4:2:0.

[링크 : http://en.wikipedia.org/wiki/Mpeg2]



MPEG-2 part 1 ~ 11

Part  1 H.222.0
Part  2 H.262
Part  3 MPEG-2 BC - backwards compatible with MPEG-1 Audio
Part  4 - conformance testing
Part  5 - software simulation
Part  6 DSM-CC (Digital Storage Media Command and Control)
Part  7 MPEG-2 NBC (Audio - Non-Backwards Compatible with MPEG-1 Audio) / AAC
Part  8 - drop
Part  9
Part 10 DSM-CC
Part 11 IPMP (Intellectual Property Management and Protection)

Audio encoding
 MPEG-2 also introduces new audio encoding methods. These are:[12]
 MPEG-2 BC (backward compatible with MPEG-1 audio formats)[6][5][9]
     * low bitrate encoding with halved sampling rate (MPEG-1 Layer 1/2/3 LSF)
     * multichannel encoding with up to 5.1 channels
 MPEG-2 NBC (Non-Backward Compatible)[6][5]
     * MPEG-2 AAC
     * multichannel encoding with up to 48 channels

[링크 : http://en.wikipedia.org/wiki/Mpeg2]


MPEG-4 part 1 ~ 27

Part  1 System
Part  2 Visual
Part  3 Audio
Part  4 Conformance testing
Part  5 Reference software
Part  6 DMIF (Delivery Multimedia Integration Framework)
Part  7
Part  8 over IP
Part  9 Reference hardware description
Part 10 AVC (H.264)
Part 11
Part 12 3gp (iso base media file format)
Part 13 IPMP
Part 14 mp4
Part 15 AVC (Advanced Video Coding)
Part 16 AFX (Animation Framework eXtension)
Part 17
Part 18
Part 19
Part 20
Part 21
Part 22
Part 23
Part 24
Part 25
Part 26
Part 27

[링크 : http://en.wikipedia.org/wiki/MPEG-4]



H.262 or MPEG-2 Part 2(known as MPEG-2 Video) is a digital video compression and encoding standard.
H.263 is a video codec standard originally designed as a low-bitrate compressed format for videoconferencing.
H.264/MPEG-4 AVC is a standard for video compression.

H.262 [링크 : http://en.wikipedia.org/wiki/MPEG-2_Part_2]
H.263 [링크 : http://en.wikipedia.org/wiki/H.263]
H.264 [링크 : http://en.wikipedia.org/wiki/H.264]