Cherck your settings fro framerates everywhere - source footage, comp, output, including any settings for dealing with fields.
ok so the screen replace footage was recorded at 60 fps, and my camera is 29.97. 29.97 is the comp setting also. how can i fix this (step by step please)
-the mask is not aplied to the screen (slender game). i duplicated the base layer and masked out the hand with an "add" mask, so the mask is actually never directly dealing with the framerate change (at least i think)
-if you look at the video, you can tell that the mask works PERFECT when it's covering up the bullet holes, just not when it's covering the slender game.
+++ i know how to use after effects pretty well, it's just when you start getting into things like framerates, aspect ratio's, and things like progrssive scan modes, etc. i get confuse, because i was never really educated on these subjects.
Well, if you already have the mask, I'd simply pre-compose it and use time-stretching to force conform it to 60fps in the parent comp and use it as a matte. That would be the only way to reliably preview the alignemnt and also offer a way of adding another correction by using additional masks on the pre-comped layer or patching things up with anotehr masked solid. If you get my meaning: Don't try to do things in just one comp. There's nothing wrong with nesting a mask 3 levels deep as long as it works...
Thanks man. aparently just precomposing the entire comp worked. thanks.