[Mp4-tech] [System][Audio]

[Ryan Lei]

Hi, Experts
As I understand, when mux AAC-LC into 3gp/mp4 file, the
decoderSpecificInformaiton structure will follow the ISO/IEC 14496-3, which
then follow ISO/IEC 14496-3 subpart 4 for AAC-LC. We found that when we use
QuickTime Pro to generate 3gp/mp4 file, the size of this part is usually 2
bytes, which only contain information about audio type, channel counf and
sampling rate. My question is for AAC-LC in 3gp/mp4 file format, what is the
Access Unit format for coded AAC-LC data, which document it is following?
Thanks
Ryan Lei, Software Engineer, Video Codec
Handheld Products Department | ATI Technology Inc. 
1.905.882.2600x2712 | www.ati.com <www.ati.com> 
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