lumimasking => increased quality in medium macroblocks, at cost of more compression in dark and bright macroblocks, useful in the 1cd xvid rip era, no good for high quality, nor for today quality standard
variance masking or vaq => port from x264 of Dark Shikari's VAQ, useful for RL content, bad for animation as it can't be tuned
both => worst quality than each one/no one
in my experience both are to avoid when using a hvs/custom matrix
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