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> The footage had a herky-jerky feel because it had been shot on hand-cranked cameras [...]. Jackson’s team retimed the footage, speeding up the frame rate, add
by combatentropy 8y ago
> The footage had a herky-jerky feel because it had been shot on hand-cranked cameras [...]. Jackson’s team retimed the footage, speeding up the frame rate, adding extra frames digitally and smoothing out the movement.
I don't know how they did this. Sure, I can understand filling in frames at regular intervals, to bring one speed up to another speed, say from 18 to 24 frames per second. But if it was hand-cranked, then the old speed wasn't exactly 18 frames per second, and I don't know how you can tell precisely what speed the cameraman was cranking at any given time.
Someone might suggest watching for when the movement of the subject or camera changed speed, but how do you know that it wasn't the person himself who slowed down or sped up, in real life, or that the cameraman's handheld pan wasn't really slowing down or speeding up?
Either this was a lot of manual trial and error, or software for this kind of thing is far better than I can imagine.
- tinco 8y agoI'd say it's a little bit like automatic stabilisation. If everything in your frame moves in the same direction at the same speed, then it's probably the camera moving, so you correct for it and the video becomes stable. Similarly you could see multiple things in the frame accelerating and decelerating at the same time and deduce it's not the things, but the camera that's doing that. That's the retiming part. Filling in frames is probably a whole lot more magic though..