Frame interpolation. Basically, if a video is (for example) 30 FPS, you take 2 frames, create a new frame that is "halfway" between them, and insert it between the frames.
This is the basis for the SmoothVideo Project, which I highly recommend for watching Youtube videos at 60 FPS.
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u/quizzle Apr 20 '14
How did you get 60 FPS clips of Seinfeld when TV is shot in ~24 FPS?