Sustainability of Digital Formats
 Planning for Library of Congress Collections

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Identification and description

Full name	MPEG-4 Version 2 file format with Advanced Video Coding, Baseline Profile
Description	MPEG-4 Version 2 file format containing AVC encoded data, baseline profile.
Production phase	See MP4_FF_2.
Relationship to other formats
Subtype of	MP4_FF_2, MPEG-4 File Format, Version 2
Contains	MPEG-4_AVC_BP, MPEG-4, Advanced Video Coding (Part 10), Baseline Profile
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.

Local use

LC experience or existing holdings	See MP4_FF_2
LC preference	See MP4_FF_2

Sustainability factors

Disclosure	See MP4_FF_2
Documentation	See MP4_FF_2 and MPEG-4_AVC.
Adoption	See MPEG-4_AVC_BP
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.

Quality and functionality factors

Moving Image
Normal rendering	See MP4_FF_2.
Clarity (high image resolution)	See MPEG-4_AVC_BP.
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.

File type signifiers

Tag	Value	Note
Filename extension	See note	See MP4_FF_2.
Internet Media Type	See note	See MP4_FF_2.
Magic numbers	See note	See MP4_FF_2.
File type brand (ISO Base Media File Format)	See note	See MP4_FF_2.
Other	66	Profile indicator. The profile_idc pertains to the encoding and is described as a part of Annex A of Part 10 of the standard, pp. 204-05.

Notes

General
History

Format specifications

• See Disclosure under Sustainability factors.

Useful references