I have a AE pro who helped me green key some very crappy footage.
He will be sending me a mask/matte that I am to align and apply to my footage to "punch me out." Sidenote: the mask/matte will be in H264
Question: How do I apply his mask to my footage in PrE4?
Thanks as always, my beloved Adobe forum heroes!
What I would have the AE artist do is provide you with an AV file (matching your Project's Preset), with the created Mask as an Alpha Channel.
Then, just Import that AV file, and use it, say on Video 2, over what you want as the background.
If all that you can get is the Mask, then you could place it on Video 3, and then apply the Effect>Track Matte Keying, linking to that Mask (a Track Matte) on Video 3.
While I work with Track Matte Keying, and often animate them with Motion>Position and Motion>Scale Keyframes, I have never used a motion Track Matte, so cannot tell you what problems you might encounter.