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MPEG-4, Advanced Video Coding, High 4:2:2 Profile
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Format Description Properties
• ID: fdd000217
• Short name: MPEG-4_AVC_H422P
• Content categories: moving image
• Format category: bitstream encoding
• Last significant update: 2005-11-08
• Draft status: Full
Identification and description
Full name | Information technology -- Coding of audio-visual objects (formal name) MPEG-4, Advanced Video Coding (part 10), High 4:2:2 Profile
NOTE: this Web page drafted prior to the amendment of the standard to add the four High profiles. Comments welcome. |
Description | The High 4:2:2 Profile MPEG-4_AVC (from ITU-T H.264) supports 4:2:2 chroma at 10 bits per channel, adaptive macroblock-level switching between 8x8 and 4x4 transform block size, encoder-specified quantization scaling matrices, encoder-specified separate control of the quantization parameter for each chroma component, and monochrome sequences. The Overview and Introduction to the Fidelity Range Extensions states that "High 4:2:2 is expected to be used frequently in studio environments." |
Production phase | Generally a final-state (end-user delivery) format. |
Relationship to other formats | |
Subtype of | MPEG-4_AVC |
Used by | MP4_FF_2_AVC_H422P, MPEG-4 File Format, V.2, with AVC, High 4:2:2 Profile |
Local use
LC experience or existing holdings | |
LC preference | |
Sustainability factors
Quality and functionality factors (video)
Normal rendering | Good support. |
Clarity (support for high image resolution) | See MPEG-4_AVC. Depends in part on the level and encoding algorithm selected. The High 4:2:2 Profile has the potential to produce greater clarity than MPEG-4_AVC_BP, MPEG-4_AVC_MP, MPEG-4_AVC_EP, MPEG-4_AVC_HP, and MPEG-4_AVC_H10P at a given picture size and data rate. By the same token, MPEG-4_AVC_H422P clarity can be surpassed by MPEG-4_AVC_H444P. |
Fidelity (support for high audio resolution) | See MP4_FF_2. |
Support for multiple sound channels | See MP4_FF_2. |
Functionality beyond normal video rendering | See MP4_FF_2. |
File type signifiers
Tag type | Value | Note |
Filename Extension | | Pertains to the file format; see MP4_FF_2 |
Internet Media Type | | Pertains to the file format; see MP4_FF_2 |
Magic numbers | | Pertains to the file format; see MP4_FF_2 |
Profile indicator | | Not yet assigned; profile_idc is described as a part of Annex A of Part 10 of the standard, pp. 204-05. |
File type brand | See note | Indicated in file wrapper and relates to "brands" defined in ISO_BMFF. Wrapping MPEG-4_AVC bitstreams in MP4_FF_1 (unlikely) would occasion the use of mp41; in MP4_FF_2 (more likely), use mp42. |
Notes
Format specifications
URLs
Print
From the ISO web site (http://www.iso.ch/ISO/en/):
• ISO/IEC 14496-10:2003 Information technology -- Coding of audio-visual objects -- Part 10: Advanced Video Coding
• ISO/IEC 14496-15:2003 Information technology -- Coding of audio-visual objects -- Part 15: Advanced Video Coding (AVC) file format
Useful references
URLs
• Overview and Introduction to the Fidelity Range Extensions (http://www.cdt.luth.se/~peppar/kurs/smd151/spie04-h264OverviewPaper.pdf)
• H.264/MPEG4-AVC Fidelity Range Extensions: Tools, Profiles, Performance, and Application Areas (ip.hhi.de/imagecom_G1/assets/pdfs/frext_icip05_final_r2.pdf)
Print
• Sullivan, Gary J., Pankaj Topiwala, and Ajay Luthra. "Overview and Introduction to the Fidelity Range Extensions." Paper presented at the SPIE Conference on Applications of Digital Image Processing XXVII, Special Session on Advances in the New Emerging Standard: H.264/AVC, August, 2004.
• See MP4_FF_2.
Last Updated: Wednesday, 07-Mar-2007 12:40:28 EST