Hydrogenaudio Forums > question about the boxes in AAC file(e.g.MP4A)

Full Version: question about the boxes in AAC file(e.g.MP4A)

Hydrogenaudio Forums > Lossy Audio Compression > AAC > AAC - Tech

wlihuay

Apr 10 2006, 18:44

Hi,everyone

I read the ISO Media File format specification MP4 Technology under consideration ISO/IEC 14496-1:2001/Amd 3,didn't find the any information about the MP4A.
But the audio file encoded by the NERO 7 (.mp4)or iTunes (.m4a)has the MP4A box contained in the sample Description box 'stsd'.

why?

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