Is there a way to import masks into AE that only have keyframes at the same frames they were made in Mocha?
For example, if I have a mask keyed at 1 and 100, Mocha seems to bake in all the frames in between. That does not allow me to practically edit them in After Effects.
Unfortunately not. There are number of reasons for this:
We convert any x-splines to bezier splines and need to keep a 1-1 mapping of animation in the conversion
If you have tracked any layer, tracking information is per-frame and the tracks have to be collapsed into the manual keyframes to maintain the correct movement.
In general it’s a lot quicker to keep doing all the roto tweaks in mocha then apply the final mask back in AE.