[M4IF Technotes] Re: Codec testing methodology

[Ralph Sperschneider]

Dear Garham, all,
I cannot tell you the details for video, but for audio there are a bunch of sequences of compressed audio coming along with reference waveforms. For most of these sequences there is a test procedure described that compares the output of your decoder with the reference waveform. You may call your decoder conform with MPEG-4 only, if the decoder passes the appropriate tests. Details can be found in the conformance part of the standard (ISO/IEC 14496-4:2000, Amd1 seems not yet been published).
Best regards,
Ralph
the_ether wrote:
> 
> Hi
> 
> Is there any standard testing regime for MPEG-4 codec? I am aware of the
> video files used for conformance testing but I was wondering whether there
> were any other guidelines such as for the intermediary steps such as ME or
> comparisons of signal to noise ratios for a given input image and a given
> target bit rate?
> 
> As far as I know there are only conformance tests and subjective tests of
> the quality of the end, decompressed images.
> 
> Regards
> 
> garham
> 
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Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
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