Sustainability of Digital Formats
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MPEG-4 File Format, V.2, with Advanced Audio Coding

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Format Description Properties Explanation of format description terms

Identification and description Explanation of format description terms

Full name MPEG-4 Version 2 file format with Advanced Audio Coding
Description MPEG-4 Version 2 file format containing AAC encoded data.
Production phase Generally used for final-state, end-user delivery.
Relationship to other formats
    Subtype of MP4_FF_2, MPEG-4 File Format, Version 2
    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.

Local use Explanation of format description terms

LC experience or existing holdings None
LC preference General preference for recorded sound is WAVE_LCPM. For compressed sound, MP4_FF_2_AAC is acceptable.

Sustainability factors Explanation of format description terms

Disclosure See MP4_FF_2
    Documentation See MP4_FF_2 and AAC_MP4.
Adoption See MP4_FF_2 and AAC_MP4.
    Licensing and patents See MP4_FF_2 and AAC_MP4.
Transparency See AAC_MP4.
Self-documentation See MP4_FF_2 and AAC_MP4.
External dependencies See AAC_MP4.
Technical protection considerations See MP4_FF_2.

Quality and functionality factors Explanation of format description terms

Sound
Normal rendering Good support.
Fidelity (high audio resolution) See AAC_MP4.
Multiple channels See AAC_MP4.
Support for user-defined sounds, samples, and patches See AAC_MP4.
Functionality beyond normal rendering See AAC_MP4.

File type signifiers Explanation of format description terms

Tag Value Note
Filename extension See note.  See MP4_FF_2 and AAC_MP4.
Internet Media Type See note.  See MP4_FF_2.

Notes Explanation of format description terms

General  
History  

Format specifications Explanation of format description terms


Useful references

URLs


Last Updated: Tuesday, 17-Mar-2015 12:45:01 EDT