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

[Alan Thomson]

Hi -
14496-3:2001 subpart 1 paras 1.5, 1.6 defines the Audio Object Type "Null"
with Type ID 0 as 16-bit PCM, if that helps?
rgds,
Alan.
> -----Original Message-----
> From: Dave Singer [mailto:singer apple.com]
> Sent: 13 January 2024 21:57
> To: John Lam; mp4-tech
> Subject: Re: [Mp4-tech] Can I use PCM or ADPCM as audio stream of .mp4
> file?
> 
> 
> 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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itrust.php
-- 
David Singer
Apple Computer/QuickTime
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