Batch replace green-screen? I have a video which uses a green screen in it. I have 1000 images which I want to be put onto the green screen, and each exported as unique videos. So, 1 image per video. 1000 images = 1000 unique videos (all from the same base video).

Obviously, doing this by hand is impractical. Assuming the green screen is perfectly green so there is no manual work involved, what is the best software / method to achieve this?
FFMPEG has colorkey and chromakey options, it does something likes
Overlay a greenscreen-video on top of a static background image

Using a shell script to loop through your thousand images on the ffmpeg command would be helpful.