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Experts: Tracked Mask, but Flipped?

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Hank Leukart
Experts: Tracked Mask, but Flipped?
on Apr 16, 2019 at 1:04:19 am

This one has been driving me crazy all day. Imagine that someone in a very long handheld shot has a big lipstick smudge below the left side of her mouth. The right side of her mouth looks fine. She sometimes talks in the shot and moves her head.

I want to remove the lipstick smudge, so I:
1. Duplicate the layer.
2. Draw a mask on the dup-layer on the right side of her mouth -- the side without the lipstick problem.
3. Track the mask.
4. Flip the dup-layer by setting Scale to -100,100.
5. Move the flipped layer so that the flipped, right side of her mouth now covers the lipstick smudge on the left side of her mouth. Because the layer is flipped, but sitting atop of a non-flipped version, her mouth now looks fine (and symmetric). (i.e. "right side lips" are now "left side lips")

PROBLEM: As soon as I hit Play, the tracked mask moves in the wrong direction. The track always moves in the opposite direction of the way it should, because the layer has been flipped so that the right-side lips match the left-side lips.

I have tried a hundred ways to make it so that the tracked mask stays stuck to her mouth without manually setting every frame, but I can't figure it out. I'm aware that this could be done by trying to blending some skin near the lipstick smudge with the lipstick smudge (i.e. basic clone stamp + mask track) but it looks significantly better with the method I describe above, if I could get it to work. Has some genius AE expert on here has done this before successfully?

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