[Mp4-tech] [System][Audio]

[Mody, Mihir]

Hi Ryan,
It is AAC RAW frame defined in Audio part of specification.
Regards,
Mihir
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Ryan Lei
Sent: Wednesday, January 19, 2024 4:16 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] [System][Audio]
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 
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