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Yes, that's how it works. Pre-compose the corner pin, use the resulting comp as an adjustment layer.
However you'll have to give me one more hint... once the tracking is done how do I apply the tracked data in order to pre-compose? Whatever I do it keeps shrinking the layer I applied the dataq to into the size of the window I have tracked... I guess I am a bit stuck!
That's what it does - any track produces coordinates relative to the source footage dimensions. Not sure where you are having problems, so let me try to recap this step for step.
- Create a comp
- Add footage
- Create a comp sized solid
- Do a corner pin track
- Apply the track to the solid
- Select solid
- Do layer --> pre-compose, choose to move all attributes
- Go back to source comp
- Turn on adjustment layer switch on pre-comped layer
- Add whatever effects you want
The effects will now only appear inside the tracked area as it effectively acts as a matte for them by ways of being an adjustment layer.
If you're doing anything like I am, I found that if you apply the "corner pin" distortion effect to your new screen layer, and copy and paste the "feature centre" frames from your tracked layer to the corner pins on your new composite layer, you should be able to get what you're after.
If you have an obstruction move overtop, I'd suggest starting with a track matte layer and mask that instead of applying the mask to the new composite layer. There's a weird scaling issue.
If you are up to date you could use mask tracking. Depending on the shot it may be easier.
Without actually seeing the video it is very hard to pick the easiest technique.