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

[sunx]

You can download the "mpeg4ip" software package and then build the AAC
bitstream from MP3 on your own.
On Thu, 13 Nov 2003, ramesh raman wrote:
> 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
> >
> >
> >
>
>