1 Solution was written above (i never tryd this one)
My Solution :
If its a Black / White Video you want to have as Mask then :
Mask Video in Layer 1 // Blend Mode 50 Mask // 100% Ocapasity
Content Video in Layer 2 /3 / 4
http://resolume.com/manual/en/r4/layers ... ompositing
Tip! One quick way of mixing videos that gives a good result is to put a black and white clip in the top layer, and a colorful one below. Then set the blend mode of the top clip to '50 Mask'. The colorful clip will now only show in the white parts of the video on top, giving a new result with every clip you try it with.
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