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My first attempt with HC encoder prooved that this theory is nothing more. Let the theory where it has to be : far from practical reality
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I make visual test with CCE and HCEnc and notch work not really good in multipass mode : these encoder use higher ratio/offset for bframe and inter matrix for Notch is really too agressive for that (high relative average coef + higher quantizer -> done high relative ringing level and poor relative quality in low motion part).
In fact inter/intra matrix coef and inter/intra macroblock setting (AQ, ration/offset for I,P,Bframe, rate control curve compression ...) aren't indepandant setting. TMPGEnc, Libavcodec, HCEnc, CCE and other don't use same internal setting for inter/intra macroblock and thus CQM matrix will not done the same final result for all MPEG2 encoder.