MPEG-4 Part 2

MPEG-4 Part 2, MPEG-4 Visual (formally ISO/IEC 14496-2^[1]) is a video encoding specification designed by the Moving Picture Experts Group (MPEG). It belongs to the MPEG-4 ISO/IEC family of encoders. It uses block-wise motion compensation and a discrete cosine transform (DCT), similar to previous encoders such as MPEG-1 Part 2 and H.262/MPEG-2 Part 2.

Examples of popular implementations of the encoder specifications include DivX, Xvid and Nero Digital.

MPEG-4 Part 2 is H.263 compatible in the sense that a basic H.263 bitstream is correctly decoded by an MPEG-4 Video decoder. (MPEG-4 Video decoder is natively capable of decoding a basic form of H.263.)^[2]^[3]^[4] In MPEG-4 Visual, there are two types of video object layers: the video object layer that provides full MPEG-4 functionality, and a reduced functionality video object layer, the video object layer with short headers (which provides bitstream compatibility with base-line H.263).^[5] MPEG-4 Part 2 is partially based on ITU-T H.263.^[6] The first MPEG-4 Video Verification Model (simulation and test model) used ITU-T H.263 coding tools together with shape coding.^[7]

^ ISO. "ISO/IEC 14496-2:2004 - Information technology -- Coding of audio-visual objects -- Part 2: Visual". ISO. Retrieved 2009-11-01.
^ chiariglione.org (2006-08-10). "Riding the Media Bits, End of the Ride?". Archived from the original on 2011-11-01. Retrieved 2010-03-10.
^ chiariglione.org (2003-10-25). "Riding the Media Bits, Inside MPEG-4 - Part B". Archived from the original on 2011-11-01. Retrieved 2010-03-10.
^ ISO/IEC JTC1/SC29/WG11 (March 2000). "MPEG-4 Video - Frequently Asked Questions". chiariglione.org. Retrieved 2010-03-10.{{cite web}}: CS1 maint: numeric names: authors list (link)
^ Touradj Ebrahimi and Caspar Horne. "MPEG-4 Natural Video Coding - An overview". chiariglione.org. Archived from the original on 2010-03-22. Retrieved 2010-03-10.
^ chiariglione.org (2009-09-06). "Riding the Media Bits, The development of MPEG-1 - Part A". Archived from the original on 2011-01-22. Retrieved 2010-03-10.
^ Fernando Pereira. "MPEG-4: Why, What, How and When?". chiariglione.org. Archived from the original on 2011-10-18. Retrieved 2010-03-10.

[iso-2004-1] ISO. "ISO/IEC 14496-2:2004 - Information technology -- Coding of audio-visual objects -- Part 2: Visual". ISO. Retrieved 2009-11-01.

[end_of_the_ride-2] riglione.org (2006-08-10). "Riding the Media Bits, End of the Ride?". Archived from the original on 2011-11-01. Retrieved 2010-03-10.

[inside_MPEG-4_part_B-3] riglione.org (2003-10-25). "Riding the Media Bits, Inside MPEG-4 - Part B". Archived from the original on 2011-11-01. Retrieved 2010-03-10.

[mpeg-4-video-faq-4] ISO/IEC JTC1/SC29/WG11 (March 2000). "MPEG-4 Video - Frequently Asked Questions". chiariglione.org. Retrieved 2010-03-10.{{cite web}}: CS1 maint: numeric names: authors list (link)

[natural-vide-paper-5] Touradj Ebrahimi and Caspar Horne. "MPEG-4 Natural Video Coding - An overview". chiariglione.org. Archived from the original on 2010-03-22. Retrieved 2010-03-10.

[inside_MPEG-1_part_A-6] riglione.org (2009-09-06). "Riding the Media Bits, The development of MPEG-1 - Part A". Archived from the original on 2011-01-22. Retrieved 2010-03-10.

[7] Fernando Pereira. "MPEG-4: Why, What, How and When?". chiariglione.org. Archived from the original on 2011-10-18. Retrieved 2010-03-10.

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