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Re: 60fps Slow Motion and Real Time in 24fps Timeline

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Jeff Pulera
Re: 60fps Slow Motion and Real Time in 24fps Timeline
on Jan 22, 2016 at 8:35:04 pm

Hi Jon,

The last thing you'd ever want to do is shoot sports/action at 24p. Ouch. Shooting 24p is best reserved for "film makers" that are going for that filmic look, then you have to alter the way you move the camera to minimize jerky shots.

If you shoot 60p and drop that clip into a 24p or 30p Sequence, you can apply 40% or 50% Speed respectively and get smooth slow-motion since you have enough extra frames from the 60p clip that no frames get duplicated. You don't need to interpret, just change speed on the clip and Premiere will handle it.

60p records 60 frames each second. Drop that 60p clip into a 30p sequence and only every other frame gets played back - only using 30 of the 60 available frames, so the one-second clip still plays in one-second. So you have enough material to play for two seconds if you use all 60 frames, so doing 50% slow provides smooth playback, playing all 60 frames over a two-second period, 30 frames per second.

For 24p you want 40% slow to use all frames smoothly (60 x 40% = 24). That would play 2.5 seconds for each second of 60p footage (60/24 = 2.5).

What the other poster may have meant is that 24p is jerky in general due to low frame rate, so even your slow-mo may look somewhat choppy when viewed at only 24fps, though the source was shot at 60p.


Jeff Pulera
Safe Harbor Computers

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