Cqms aren't usefull for anime until there won't be any visible ringing artefacts, at which point a cqm that can preserve more detail and block less will probably help. However I don't have a good idea of where the trade off occurs since I don't encode anime much. Which is why I recommended a more conservative solution by just lowering the deadzone setting, which might work better for anime at high bitrates then one of my cqms anyway, as I said I have not done much testing on the subject.
In theory it should be possible to make a matrix that looks better on anime then the flat matrix at higher bitrates, I beleive Soulhuter made one for Xvid a while ago, but its not something I've given much thought to.
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