Here's something - https://stackoverflow.com/questions/11453082/how-to-generate-a-2hour-long-blank-video

From the link :

" You can use ffmpeg for this:

ffmpeg -t 7200 -s 640x480 -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/zero empty.mpeg

-t:       length of the video
-s:       frame size
-f:       video format
-pix_fmt: pixel format
-r:       fps
-i:       input "


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