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Topic: .m4a encoded packaging (Read 3123 times) previous topic - next topic
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.m4a encoded packaging

Hello
      I want to know the packaging of .m4a encoded data i.e. how samples of one frame and corresponding scalefactors information is package in .m4a file format.
Thanks
soman N

.m4a encoded packaging

Reply #1 –
The AAC data is stored normally, but there is no header.  Decoder configuration information is stored in a special place.  Each 'sample' in the mp4 file contains one frame of AAC.

The file format and AAC codec format are too complicated to explain in a forum post.  Information about the MP4 file format can be found in MPEG-4 Part 12 and 14.  Information about the AAC codec can be found in MPEG-4 Part 3.  These documents may be purchased from ISO.