Sustainability of Digital Formats: Planning for Library of Congress Collections |
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Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact |
Full name | Information technology -- Coding of audio-visual objects (formal name); MPEG-4, Advanced Video Coding (part 10), High 4:2:2 Profile |
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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." NOTE: this Web page drafted prior to the amendment of the standard to add the four High profiles.Comments welcome. |
Production phase | Generally a final-state (end-user delivery) format. |
Relationship to other formats | |
Subtype of | MPEG-4_AVC, MPEG-4, Advanced Video Coding (Part 10) (H.264) |
Used by | MP4_FF_2_AVC_H422P, MPEG-4 File Format, V.2, with AVC, High 4:2:2 Profile |
LC experience or existing holdings | |
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LC preference |
Disclosure | Open standard. See MPEG-4_AVC. |
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Documentation | See MPEG-4_AVC. This profile is not yet in the formal specification; information may be found in Overview and Introduction to the Fidelity Range Extensions. |
Adoption | See MPEG-4_AVC_HP and MPEG-4_AVC. |
Licensing and patents | See MP4_FF_2. |
Transparency | See MP4_FF_2. |
Self-documentation | See MP4_FF_2. |
External dependencies | See MP4_FF_2. |
Technical protection considerations | See MP4_FF_2. |
Moving Image | |
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Normal rendering | Good support. |
Clarity (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. |
Functionality beyond normal rendering | See MP4_FF_2. |
Tag | Value | Note |
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Filename extension | Not applicable. | Pertains to the file format; see MP4_FF_2 |
Internet Media Type | Not applicable. | Pertains to the file format; see MP4_FF_2 |
Magic numbers | Not applicable. | Pertains to the file format; see MP4_FF_2 |
File type brand (ISO Base Media File Format) | 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. |
Indicator for profile, level, version, etc. | 122 |
profile_idc; described as a part of Annex A of Part 10 of the standard, pp. 204-05. |
Pronom PUID | See note. | PRONOM has no corresponding entry as of July 2022. |
Wikidata Title ID | See related format. | See MPEG-4, Advanced Video Coding (Part 10) (H.264). |
General | |
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History |
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