Is there any way to move an object but keep its mask static? For example: I want to make a video "appear" on screen coming from behind an invisible "line" (The mask), but animating the video, not the animating to the mask to reveal the object. How can I do this? I just want a static mask
So you want to reveal the video from behind an object that is inside that same video clip? You'll have to duplicate the clip on top of itself (Opt-drag). Mask the top copy, animate the bottom copy. If I'm understanding you correctly.
Or, add a Gap Clip or Solid generator above the clip, crop it, and animate the video below it.
Or, you could animate the video by keyframing the start and end. Then add keyframes for the Crop parameters at the start and end to match.
I guess I'd need to see an example of what you're trying to do.
its a bit complex - as I'm working on a wide canvas with an even wider moving compound clip which has a stencil alpha on it (Being moving footage within text) over it. At one point I want to mask off, or in fact drop the opacity on part of the screen ie just the left side. AS I'm moving the large stencil alpha compound clip it seems any mask or wipe will move with the shot. The closest I've got is to animate a draw mask on one copy of the compound clip to reveal a second copy below which has lower opacity. See attached - thanks Bob
Take your Compound, call it "Layer 1 Compound", and keyframe it to animate across the page as you want it.
Then put the Layer 1 Compound inside of another Compound called "Layer 2 Compound" and mask that Layer 2 Compound.