Sustainability of Digital Formats: Planning for Library of Congress Collections
Sustainability of Digital Formats: Planning for Library of Congress Collections |
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | ISO/IEC 14496-15:2004. Information technology -- Coding of audio-visual objects -- Part 15: Advanced Video Coding (AVC) File Format (formal name); MPEG-4 AVC file format (common name) |
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| Description |
The third MPEG-4 file format developed by the Moving Picture Experts Group (MPEG). The format's object-based design defines a set of tools that present binary coded representation of individual audiovisual objects, text, graphics, and synthetic objects. (See Notes below.) This format wraps Advanced Video Coding (AVC) with certain extensions, described in MPEG-4_AVC_EXT. Without those extensions, AVC may be wrapped in MP4_FF_2. 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. |
| Relationship to other formats | |
| Subtype of | ISO_BMFF, ISO Base Media File Format |
| Has subtype | MP4_FF_AVCE_AVCE, MPEG-4 File Format for AVC (Ext), with Non-FRExt Extended AVC Coding |
| 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 Moving Picture Experts Group (MPEG), Coding of audio, picture, multimedia and hypermedia information. |
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| Documentation | ISO/IEC 14496-15:2004. Information technology -- Coding of audio-visual objects -- Part 15: Advanced Video Coding (AVC) File Format. See complete list of ISO MPEG-4 documents in the description of MP4_FF_2. |
| Adoption | Unknown to the compiler of this document |
| Licensing and patents | See MP4_FF_2 |
| Transparency | Depends upon included encodings, but all MPEG-4 encodings depend upon algorithms and tools to read and require sophistication to build tools. |
| 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 MP4_FF_2 |
| Clarity (high image resolution) | See MPEG-4_AVC_EXT |
| Functionality beyond normal rendering | See MP4_FF_2 |
| Sound | |
| Fidelity (high audio resolution) | See MP4_FF_2 |
| Multiple channels | See MP4_FF_2 |
| Functionality beyond normal rendering | Not investigated at this time. |
| Tag | Value | Note |
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| Filename extension | mp4 |
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| Internet Media Type | video/mp4 |
Most frequently cited MIME type; for more information see MP4_FF_2. The compiler of this document welcome comments on the use of MIME types for various MPEG-4 file formats. |
| Magic numbers | Not found. | Comments welcome. |
| File type brand (ISO Base Media File Format) | avc1 |
ISO_BMFF includes a file type box that contains major and minor brands (identifiers); this brand is specified in Part 15, Section 5 (ISO/IEC 14496-15:2004. Information technology -- Coding of audio-visual objects -- Part 15: Advanced Video Coding (AVC) File Format, p. 13), only when certain AVC extensions are used. |
| General |
The four file formats associated with the ISO/IEC 14496 family of specifications are:
For more extensive information about MPEG-4 file formats, see MP4_FF_2 |
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| History |
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