thank you very much tebasuna51 for the explanation. then i have one more question: now to do the best to sync this ac3back to video i'd need a negative audio delay of 6ms and mkvmerge does allow delays of multiples of 2ms. at the same time from what i remember audio delays can only work if they are multiples of frame size (32ms in this case), so telling mmg to use -6ms delay will only result in some unpredictable behavior right?
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