[M4IF Technotes] questions about mpeg-4 file format

[xin chen]

Hi All,
I read the related part in ISO/IEC 14496-1, and
quicktime file format, but they are all concentrate on
the meta-data part, that is the structure of moov
atom. I want to know more about how the samples are
stored (in mdat atom, right). Where to get documents?
And about the SL layer, since the SL packet hearder is
composed according to the SLconfigdescriptor, which is
stored in ESDescriptor, my question is: the SL packet
hearder are generated only when the mpeg4 file is
transmitted, or is it stored already in the .mp4
(Because on the figure 1 of ISO/IEC 14496-1, the
terminal get a file from storage medium will need to
go through deliver layer and sync layer for decoding
too.)? I think it's a waste to store the same inf.
twice.
Thank you very much.
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