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 | Formal name (for set of specifications that include Part 14, MP4 File Format, and Part 2, Visual [encoding]): ISO/IEC 14496. Information technology -- Coding of audio-visual objects. Common name: MPEG-4 file format, version 2, with Visual Coding. |
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| Description | Combination of a file format (wrapper) and encoding category (Visual Coding, all profiles). |
| 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_2, MPEG-4 File Format, Version 2 |
| May contain | MPEG-4_V, MPEG-4, Visual Coding (Part 2) (H.263) |
| May contain | AAC_MP4, Advanced Audio Coding (MPEG-4) |
| 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 | The content produced by the NDIIPP partnership project with SCOLA consists of foreign television news broadcasts in MP4_FF_2_V, MPEG-4 File Format, V.2, with Visual Encoding. |
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| LC preference |
| Disclosure | Open standard. Developed through ISO technical program JTC 1/SC 29 for coding of audio, picture, multimedia and hypermedia information by Working Group 11 (WG11) aka the Moving Picture Experts Group (MPEG). |
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| Documentation | See MP4_FF_2 and MPEG-4_V. |
| Adoption | See MP4_FF_2. |
| Licensing and patents | See MP4_FF_2. |
| Transparency | See MPEG-4_V. |
| 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_V. |
| 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 | See MP4_FF_2. |
| Tag | Value | Note |
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| Filename extension | See related format. |
See MP4_FF_2 |
| Internet Media Type | See related format. |
See MP4_FF_2 |
| Magic numbers | See related format. |
See MP4_FF_2 |
| File type brand (ISO Base Media File Format) | See related format. |
See MP4_FF_2 |
| General | The video-capable iPod introduced by Apple in late 2005 features this specification: MPEG-4 video up to 2.5 mbps, 480 x 480, 30 frames per sec., Simple Profile [MPEG-4_V_SP] with AAC-LC [AAC_MP4_LC] up to 160 Kbps, 48 Khz, stereo audio in .m4v, .mp4 and .mov file formats. |
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| History |
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