[Mp4-tech] another audio codec inside MP4 File

[Dave Singer]

At 10:05 AM +0530 2/3/05, Lakshman Kumar wrote:
>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

QuickTime does not play .amr files, only .3gp files.
>
>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 
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>
>
>--
>lakshman kumar

-- 
David Singer
Apple Computer/QuickTime