[Mp4-tech] another audio codec inside MP4 File

[Lakshman Kumar]

hi all ,
i have amr extracted content from a 3gp file..,but amr decoder is not
decoding them .those bitstreams contains audio.after adding amr magic
number(#!AMR\n) i could play my file in quick time .,
plz do help me
thx in advance
On Wed, 2 Feb 2024 10:51:55 -0800, Dave Singer <singer apple.com> wrote:
> At 12:45 AM -0800 2/1/05, Ravi wrote:
> >Hi ALL,
> >    Thanks for ur initial reply.
> >
> >   I can use the ObjectTypeIndication for the corresponding audio format
> >   as specified but the ObjectTypeIndication is related to mpeg only.
> >   What if i want to use AC-3 audio inside the MP4 File format.
> >
> >   I am not finding any details how i can specify the
> >   DecoderConfigDescriptor in ES_Descriptor for such audio format (AC-3)
> >   inside the esds atom in mp4 file format.
> >
> >   Please guide me to embedd AC-3 inside MP4 File Format.
> 
> I am not aware of any such definition.  You might want to work with
> Dolby on getting one published.  I suspect it is not hard.
> 
> An alternative to the OTI is to define a new SampleEntry
> four-character code.  See www.mp4ra.org for examples.
> 
> >
> >   Regards,
> >   Ravindra Dolas
> >
> >
> >
> >
> >
> >
> >
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> --
> David Singer
> Apple Computer/QuickTime
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio, [video], [systems], [general] or another apppropriate identifier to indicate the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust guidelines found at http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php
> 

-- 
lakshman kumar