Some addition. As I figured out the problem is with overlay in YV12 only (other apps showed the very same dots only in this colorspace). If overlay is in YUY2 no dots are shown. So WMP seems to be not using overlay at all or converting the colorspace on the fly. And I think DivX decoder shows in YUY2, so no bots too. Now that's the question: is there any way to force bsplayer to overlay only in YUY2?
Oh, by the way. I use Det. 42.01.
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