Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | Formal Name (for set of specifications that include Part 15, MP4 AVC File Format, and Part 10, Advanced Video Coding): ISO/IEC 14496. Information technology -- Coding of audio-visual objects. Common name: MPEG-4 File Format for AVC (Ext), with Extended AVC Coding. |
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| Description | Combination of a file format (wrapper) and encoding category (Advanced Video Coding; AVC, Extensions) within the MPEG-4 family. This version of AVC entails the use of the extensions listed in MPEG-4_AVC_EXT. The extensions described here predate the FRExt (Fidelity Range Extensions), being finalized in 2005 and represented by four new profiles: MPEG-4_AVC_HP, MPEG-4_AVC_H10P, MPEG-4_AVC_H422P, and MPEG-4_AVC_H444P. |
| Production phase | Generally a final-state (end-user delivery) format, may also serve as middle-state format. |
| Relationship to other formats | |
| Subtype of | MP4_FF_AVCE, MPEG-4 File Format for AVC (Extensions, Part 15) |
| Contains | MPEG-4_AVC_EXT, Advanced Video Coding, Extensions |
| May contain | AAC_MP4, (MPEG-4 Advanced Audio Coding) |
| May contain | AAC_MP4_LC, AAC (MPEG-4) Low Complexity Object |
| May contain | Additional audio, graphics, and scene graph stream types. Not documented at this time. |
| LC experience or existing holdings | |
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| LC preference |
| Disclosure | Open standard. Developed by ISO technical program JTC 1/SC 29 (WG11), aka the Motion Picture Experts Group (MPEG). See http://www.itscj.ipsj.or.jp/sc29/. |
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| Documentation | See MP4_FF_AVCE and MPEG-4_AVC_EXT. |
| Adoption | See MPEG-4_AVC. |
| Licensing and patents | See MP4_FF_2. |
| Transparency | See MPEG-4_AVC. |
| 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 | See MPEG-4_AVC_EXT. |
| Clarity (high image resolution) | See MPEG-4_AVC_EXT. |
| Functionality beyond normal rendering | Not investigated |
| Sound | |
| Fidelity (high audio resolution) | See MP4_FF_2. |
| Multiple channels | See MP4_FF_2. |
| Functionality beyond normal rendering | See MP4_FF_2. |
| Tag | Value | Note |
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| Filename extension | See note. |
See MP4_FF_AVCE |
| Internet Media Type | See note. |
See MP4_FF_AVCE |
| Magic numbers | None found |
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| File type brand (ISO Base Media File Format) | See note. |
See MP4_FF_AVCE |
| General | |
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| History |
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