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MPEG-4 File Format, V.2, with Advanced Audio Coding
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Format Description Properties
• ID: fdd000234
• Short name: MP4_FF_2_AAC
• Content categories: sound
• Format category: file format, bitstream encoding
• Last significant update: 2004-11-09
• Draft status: Full
Identification and description
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
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
Quality and functionality factors
Normal rendering | Good support. |
Fidelity (support for high audio resolution) | See AAC_MP4. |
Support for multiple sound channels | See AAC_MP4. |
Support for downloadable or user-defined sounds, samples, and patches | See AAC_MP4. |
Functionality beyond normal rendering | See AAC_MP4. |
File type signifiers
Notes
Format specifications
URLs
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• ISO/IEC 14496-1:2001 Information technology -- Coding of audio-visual objects -- Part 1: Systems
• ISO/IEC 14496-1:2001/Amd 1:2001 Extended BIFS
• ISO/IEC 14496-1:2001/Amd 4:2003 SL extensions and AFX streams
• ISO/IEC 14496-3:2001 Information technology -- Coding of audio-visual objects -- Part 3: Audio
• ISO/IEC 14496-3:2001/Cor 1:2002
• ISO/IEC 14496-3:2001/Amd 1:2003 Bandwidth extension
• ISO/IEC 14496-12:2004 Information technology -- Coding of audio-visual objects -- Part 12: ISO base media file format
• ISO/IEC 14496-14:2003 Information technology -- Coding of audio-visual objects -- Part 14: MP4 file format
Useful references
URLs
•
MPEG-2/MPEG-4 AAC page from MP3-tech.org (www.mp3-tech.org/aac.html)
•
"MP3 and AAC Explained," by Karlheinz Brandenburg, Fraunhofer Institute, Erlangen, Germany (focus on AAC_MP2; http://www.aes.org/publications/downloadDocument.cfm?accessID=14703162000122117).
•
Site for users of the format (http://www.m4a.com/)
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Last Updated: 03/ 7/2007