Hi Andrew -

> quantisation matrix for each DCT that you can specify in each picture
> coding sequence.   However, a well-known trick is to selectively 0 
> isolated bins (they have a high coding overhead) you think won't reduced SNR

        Is this the "single coefficient elimination" that is used by
        ffmpeg's MPEG-4 encoder?

> this means that I can't easily do this for the project without risking nasty 
> IP issues.

        I wonder how folks on other projects deal with the situation - or 
        perhaps they are risking the IP issues.

        Cheers,
        Steven Schultz


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