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In the video they seem to be creating new frames inbetween the medium's original frames and then slowing/speeding it up with speed control.

It looks like the equivalent of going every frame and defining a new frame that's a gamma cross between the surrounding 2 frames.

Simply increasing the fps or changing the speed alone can't facilitate this effect. What programs can do the effect as shown, and what's it called specifically? Or do they manually have to take 1 frame, toss it in a vector image editor of some kind and create all those inbetween frames?

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    Am I missing something? It's animation - all the frames are created, they can do whatever they want with the timing.
    – stib
    Commented Mar 5, 2019 at 6:37
  • I was confused by that, too. But apparently this was fan created from existing content, not original animation.
    – Michael Liebman
    Commented Mar 6, 2019 at 0:18

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There are methods to generate frames in between frames, mostly giving you mixed results.

For one, the plugin "twixtor" (~330$) actually does a somewhat decent job at assuming missing frames, so much so, that a 30fps video can be played back at half the speed, making it look like 60fps slow-mo.

On the other hand side, you can sample the frames directly in premiere for example. I wouldn't recommend it however, as the results don't usually live up to the expectations.

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  • I'd just add to this that Twixtor, et al, use what's called "optical flow analysis" to generate the in-between frames, which is available in all the major NLE's today.
    – Jason Conrad
    Commented Mar 5, 2019 at 18:37
  • I'm curious what other programs are available to do this. In this instance I'd bet twixtor is very program used. I noticed ffmpeg has minterpolate.
    – kite
    Commented Mar 6, 2019 at 0:27

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