I'm encountering a couple of problems with masks in my AE project. I've had no luck finding any similar problems documented anywhere on the internet.
I have footage of a man exiting a room through a door, where the room beyond the door needs to be replaced. I did a basic rotoscope using several masks. I put a blue solid behind the video layer to help show the issues.
The first problem is that one of the mask's edges is off. The mask will not go all the way to the edge of the mask line on one corner.
The second issue is the mask is completely offset on one frame.
I can manually move the masks to compensate for this issue, but their borders don't represent what they should be masking. I'm hoping I may have overlooked something simple.
Are there any effects on the layer at all?
What exact version of After Effects?
What are your system specs?
What format and codec is the footage?
Odd zoom, motion blur, framerate mismatch between footage and comp, pixel aspect ratio issues. Either or any combination of those. You have not provided enough info to make any sense beyond that.
Turns out a camera tracker effect I had was causing those problems. Very strange that it would cause an issue to sporadic frames of the mask.