[Mp4-tech] Decoding an MPEG-2 AAC stream : Help

[ramesh raman]

Hi all
Could somebody please tell me where i can get some sample audio streams 
encoded  using AAC, twin Vq and Bsac  with MPEG-4  system header format. 
It would be extremely helpful if i can get the  parameter string needed 
for decoding also. It appears to me that in order to decode any MPEG-4 
stream i need to know the encoding tools applied on it. Is my 
understanding correct  ?
thanks in advance
/ramesh
I found some streams on the web, that had the mdat in it, but then when 
i try to decode them, i get an error saying
"Found MP4 file with  1 suitable Tracks
Failure: Can't handle OD profile 2"
Heiko Purnhagen wrote:
>Hi,
>
>  
>
>>ramesh raman wrote:
>>
>>Hi,
>>Thanks for the quick response.  But i dont understand.
>>My  problem is i have  an MPEG2-ADTS stream. It is an AAC stream. I
>>want to decode this using the MPEG-4.
>>    
>>
>
>mp4audec expects files in the MPEG-4 file format (as defined in ISO/IEC
>14496-1:2001) ... and this is something completely different from ADTS.
>If you want to decode ADTS files, use mp4mcDec instead: it handles
>MPEG-2/4 AAC compressed data stored in ADIF, ADTS, raw, or MP4 files.
>
>     Heiko
>
>  
>

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