Make 60fps look like 24fps?

Elmy

Elmy

Well-known member
I'm not quite sure how its done, but I've seen in videos where it goes from normal speed to slow motion, back to normal speed and when it's normal it looks like 24fps, 60 is a quite distinguishable and so I know it wasnt in that speed, although the slow motion is so smooth it couldn't have been shot in 24fps. So is there something being done to make the 60 look like 24? Or is there a totally other thing happening and I'm way off base? I'll look for an example but I dont have one at this moment.
 
Changing the speed mid shot is called ramping.
Is your question about the motion characteristics due to the shutter speed? I guess the best you could do if your camera doesn't have ramping ability (the RED Scarlet will be able to) is to shoot as close as you can to a 360° shutter (1/60th for 60 fps video) and do some tests to see if it looks acceptable.
 
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Ya i guess speed ramping was what i was looking for. I have an HMC150 and it obviously cant do that and I just wasnt sure that other cameras could.
 
Most video cameras are unable of ramping. In the mid 90's this was a very popular technique. Arriflex cameras were and are capable of this with some add ons.

Speed ramping is most commonly done now in post. In FCP it is called time re-mapping.
 
Ya I heard AE had a way of doing it pretty well, too bad I only have FCP at the moment. The problem I've run into with Time remapping is it only looks decent on my 60p footage, not my 24 and so I cant go from normal footage to slow, I've only been able to go from slow to fast back to slow with 60
 
Elmy said:
The problem I've run into with Time remapping is it only looks decent on my 60p footage, not my 24 and so I cant go from normal footage to slow, I've only been able to go from slow to fast back to slow with 60
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Hang on, why is that? Can't you change the speed of the 60p footage to 24/60 = 40% to make it play back at normal speed?

Yes, After Effects does have the ability to gradually change the speed of a shot. They call it Time Remapping. You have to stick to whatever shutter speed the footage it shot at, though. The advantage of ramping in camera, as I understand, is that you can vary the shutter speed as well. Probably not usually a big deal though.
 
You would actually need to speed the footage up 40%, but this might result in unnatural stuttering since 60 is not a multiple of 24. Starting with 48p footage would work much better.
 
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