So if a video contains a still or mostly still image it *should* be able to compress to a smaller size because it only needs to send the difference between frames (which would be none).
But, sometimes videos are compressed to be a fixed amount of data per second, in which case it would be the same file size no matter what is on screen (so would be basically wasting data).
I’d hope YouTube would use the first option and a video like that would use less data, but there’s no guarantee.
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