I am trying something very simple but it proofs to be hard to accomplish; I want to mask out a dj stage so i can position it over a vj background and then put it out as a livestream.(that part is covered) I use a webcam to film the stage, use it as an input and then mix visuals behind and in front of it.
I made this try out example with my kitchen as 'the dj stage'. So how is this not working? one slice takes the input from the webcam the other slice from a group with a couple of content layers. The slices are masked but The top mask, masks also the the bottom slice. Is this even possible or am doing something totally wrong here ?
any help is much appreciated!

Nils