Mostly talking about in some anime openings and edited scenes, like this one https://youtu.be/nJlmcQA_dVQ . Do they really go in and draw extra frames, or is there a program that just adds in extra scenes?
In: Technology
The easiest would be just copy and paste previous frames. There are also programs that does motion smoothing and would fill in the frames in between. This is known as the soap opera effect.
It depends. Drawing an adding extra frames is a real chore so it’s often not used. What often is used is let the computer generated frames in between. It looks at the “real” frames before and after and tries to blend the picture and sometimes even try to extrapolate movement.
You have five frames of video ABCDE to represent 1/6 of a second at 30 fps. Now we duplicate frames, AABBCCDDEE, 10 frames, run it at 60 fps, and it’s still 1/6 of a second. You’ve now converted 30 fps to 60 fps.
For 24-60 fps you have to do something called 2:3 pulldown. You can’t double 24 to make 60, so you triple alternate frames to make up the difference. ABCDEF, six frames, is 1/4th of a second at 24 fps, so we expand that to AABBBCCDDDEE, 12 frames, 1/4th of a second at 60 fps.
If you’re playing 30 fps on a 60 fps monitor, the monitor is just displaying the frames on screen for an extra cycle.
Modern computer software still inserts these new frames, but it can guess at what the added frames would look like if it were actually recorded at 60 fps based on the previous and later frames, and insert the guessed frame instead. Of course the quality of the result depends on the quality of the algorithm.
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