Thanks for your reply!
Sebastien-R wrote:If you want different videos on different surfaces, you must create one video who contain the other videos and select the surface you want.
When creating the combined video file, should I put the different video files literally
next to each other, in order to select the different surface in the input screen (and won't this harm the output resolution)? Or should I put them after each other in a time line (linear) in able to select the different time frames on each of the surfaces?