Composition speeds up when I change Framerate.

Question

Hello!

it used to be like this: If I have a Composition with 25 fps and I want to have a "stop motion" effect, I can either use the effect "posterize time" - OR I change the composition fps to 12 fps.

Today I noticed that if I do that (lower the FPS of the composition) it speeds up the animation accordingly. I tried changing the "preserve framerate" in the advanced setting.

Basically it behaves like changing how to interpret the footage itself.
I am pretty sure this behaviour is not like it used to be, or I changed some setting I can't find.

I would be really grateful to the community to help me in this matter.

Cheers,
Alexander

Rick Gerard · Accepted Answer

I cannot reproduce your bug. I suggest you reset your preferences and/or reinstall. That kind of a bug makes absolutely no sense at all.

I created a comp, changed the frame rate several times, and found no problems. The comp always remained 4 seconds long. If your comp duration is not changing, your preview is fouled up. I can't make mine foul-up.

Comp and demo video uploaded.

Rick Gerard · Answer

The timeline and all keyframes are time-based, not frame rate based. Changing the composition's frame rate does not change the speed of the playback. It just changes the number of frames per second. Never has. Never will.

Changing the frame rate of footage does change the speed of playback. If the original footage was shot at 30 fps and you interpret (change) the frame rate to 60, one second of real-time (original footage time) becomes 1/2-second of screen time.

Nested compositions (pre-comps) are essentially footage. If you change the frame rate of a nested comp, the playback speed will change just as it changes when you change the interpreted frame rate of the source footage. It has always been that way. It always should be that way.

I'm not sure what you are doing, but I think you are changing the frame rate of a nested composition, turning on Preserve Frame Rate When Nested, and then collapsing transformations. That will always turn off Preserve Frame Rate. It always has.

By @Rick Gerard

Thank you for replying! No, it did exactly what I described. It did change the speed of the playback. I also did a test at a colleagues computer. Change framerate to 12 - it stuttered. Then saved the file, send to me and opened on my computer. And it was having faster playback. The question is not if it happened. The question is if it was a bug or a new option I am not aware of. I solved the problem by resetting the preferences.

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