[Mp4-tech] [Audio]: mp4audec Conformance Issues

Fri Dec 1 14:03:51 ESTEDT 2006

Garima Singh wrote:
> Hi All,
>  
> If I am decoding the mp4 streams available at
> ftp://mpaudconf:[email protected]/ with the mp4audec.exe that I 
> got after building reference software I am not getting output wav 
> files bit exact with reference wav files available at the same 
> location. What could be the reason?
>  
> Regards,
> Garima
>
>
> Regards,
> Garima Singh
>
> TIVR Communications - Delivering Efficient Solutions for Mobile 
> Multimedia 
> www.tivr.co.in <http://www.tivr.co.in/>

Dear Garima,
bit exactness is not alway a requirement (usually it is not required 
except for the lossless codecs). The conformance requirements for 
particular sequences are defined in ISO/IEC14496-4. The reasons, why you 
do not achive bit exactness might be due to another compiler, another 
computer plattform or even due to the fact, that the reference waveforms 
were not generated by the reference software decoder.
Best regards,
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 398
Am Wolfsmantel 33               | mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen                | http://www.iis.fraunhofer.de/amm/