Mixing framerates in timeline (Still don’t understand)

[Jeff Pulera]

I would have to to disagree on this one – “60p records at 30 frames per second with two progressive fields per frame.”

It is true that 60i records 30 frames per second, with 2 fields making up each frame (60 fields, or half-frames). Not true for 60p – which is made up of 60 progressive frames. Each frame is complete on its own. Therefore, when put into a 30p timeline at normal playback speed, only every other frame is displayed the same as if the video was recorded at 30p. One second of 60p plays for one second in a 30p timeline, with half the frames being disregarded.

A benefit of 60p in a 30p timeline is smooth slow-motion at 50% speed. 30p uses displays 30 frames every second. If the source is 60p, it has 60 frames per second. Played at 50% speed, one second of 60p plays for two seconds in a 30p timeline (at 50%) so there are no duplicate frames, no stuttering/choppy playback. 60p in a 24p timeline at 40% runs for 2.5 seconds, also nice and smooth.

The thing about 24p is that it is used for Hollywood movies because it has that “cinematic” look to it. That looks includes very choppy pans!! Unless you are purposely trying to get the movie look, do not shoot anything at 24p! It requires a whole different way of shooting to avoid issues. Not good at all for anything with fast action/fact camera moves.

If you take 60p or 30p down to 24p, you automatically get choppier motion since there are less individual frames being shown each second, but then you also get the weird cadence (order of frames) since the math doesn’t divide out evenly.

Thanks

Jeff

[Jon Shank]

Up above someone said the cadence putting 60 into a 24 is okay because of a “natural 3:2 pulldown”.

Is 60 in a 24 timeline good or bad or just okay?

[Bala Chandran]

My point was to not think that 60p will play at 50% slower speed compared to 30p, regardless of sequence settings. 30p, 60p and 60i will all play at the same speed. For instance an event that lasts for one second will play for one second, no matter 30p, 60p, 60i, 25p, 24p, 48p or 15p it’s recorded at. Will play differently only if recorded as slow motion.

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[Bala Chandran]

May be I misread the original post.

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