Is there a script that will allow me to slice a mask in half.
I had to remove a couple of signs from a scene where the characters occasionally move quickly in front of the sign.
After removing the signs, to put the character back in, I found I created two masks for the character, one for the leading edge which ended up having a 3px feather, and one for the trailing edge which ended up 50-150 pixels.
So the idea is roughly mask out a subject, keyframe it (as few as possible :), focusing on the leading edge of motion. when that works split the mask/s in two (vertically) and set the feather of the trailing edge to be larger.