Thanks for your answer.
I’m not sure it will solve my problem though. I’ve read about it the past days but I’m not sure…
My problem is that I want to mask out the top layer with the still image, on the frames where the underlaying interacts with that zone.
The still image is a logo that I want to put over a logo in the clip below when one’s persons arm is over the logo in the video. So it’s not the video clip I want to mask, it is the layer on top with the still image.
Or, do you still believe the Rotobrush will do the trick for me?!
Thx! 🙂