MEncoder/FFmpeg can overlay a video with an image from the command line. Is this possible with a video?
I want to overlay a video with another dynamic video. Some parts of the overlayed video must be see-through (the parts where nothing is actually there, an arrow shows up on the screen and then disappears and then I do not want the whole screen to go black because of no background, only the arrow is shown etc).
My guess is that the overlayed video must have alpha levels enabled in the encoding or something? Please shed some light which encoding I must use on the overlayed video. The combined video should be encoded as one of the most universal formats if possible.