[Mp4-tech] Can I use PCM or ADPCM as audio stream of .mp4 file?

[Dave Singer]

At 12:16 PM +0800 1/9/04, John Lam wrote:
>Hi all,
>
>I'm now working on construct .mp4 file with both visual and audio
>stream. Can audio stream data be non-compressed PCM (16 bits) or IMA
>ADPCM (4 bits) data? If so, how to fill the whole 'trak' atom and its
>sub-atom such as 'hdlr'? If not, what file format should I use for
>packing MPEG4 visual stream simple profile confirmed to ISO/IEC 14496-2
>and audio stream is either non-compressed PCM or IMA ADPCM together?
>Thank you for your help!

MPEG-4 doesn't define an uncompressed storage, except that there is 
(I think) some way of labelling a stream as AAC but storing it 
uncompressed.  However, the Motion JPEG 2000 spec (part 3) does 
define uncompressed 8 and 16 bit storage;  and MJ2 uses the same file 
format as MP4.
Hope this helps.
>
>--
>Best Regards,
>
>John Lam
>
>
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-- 
David Singer
Apple Computer/QuickTime