In regards to the 60p interpolation here: http://www.spirton.com/convert-videos-to-60fps/
Is it possible to take the finished output and re-render it, halving the playback rate of course, back to 30p, then processing it again? Virtually making it 120p.
Or if that's no good, how about converting native 60p to 30p first, then running it through AviSynth.
I know I should just try it and see, but wanted to get some guidance first.
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Add to your 30p=>60p script
AssumeFPS(30)
This slows down your 60p file in half. (Same framecount, so duration is 2x; it just plays at 1/2 speed)
Or if you want 29.97 (approx) it would be
AssumeFPS(30000,1001) -
For some sections they probably used higher speed e.g. interpolate 60fps to 480fps , then playback at 30fps . That would give you 16x slow mo
The higher your starting fps, the better results, because there are more "real" frames per second to interpolate from. Faster shutter also helps (harder to interpolate from motion blurred frames). You can always add motion blur in post, but it's much more difficult to sharpen a blurry image -
Yes you can do it with avisynth or twixtor
But gradual ramping (gradual speed changes, e.g. slowly speeds up & down in sections, or reverses) are much more difficult to do with avisynth alone because coding it would be "clunky"; it would be easier to take that interpolated footage and plug in NLE e.g. vegas velocity envelope, time remap in AE, etc...
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