Roto Brush tool suddenly not working

[brandonb81413799]

Hi there!

I'm new to After Effects and Rotoscoping in general.

My first time using the rotobrush tool, I had no issues. Once I got to my third project however, the brush worked perfectly fine on the first frame but stopped selecting anything at all on the subsequent frames. I tried changing the versions of the brush, messing around with the alpha layers at the bottom, restarting the program and my computer and nothing worked. My program is also up to date. I attached a video down below to show what I mean.

Has anybody encountered this problem and been able to solve it?

Thanks!

[Mylenium]

Seems perfectly fine within the logic the tool uses anjd given that you have not set any propagation spans. That's the real flaw here. You need to give it something to actually analyze srather than just placing new base frames. You may want to read the online help and check the respective settings in the effect. Outside that the usual things apply: Check your hardware acceleration, clear out caches, check the integrity of the source footage.

Mylenium

[brandonb81413799]

Thanks Mylenium,

I managed to figure it out. It seemed to work fine again when I set the composition frame rate to the same as the footage. I'll look into propagation spans, that knowledge might be useful to have since I see myself using the tool a lot more in the future.