without knowing exactly what you want to accomplish (a screen shot can do wonders) it looks to me that you don't have to track the perspective so it is much easier to translate the mocha data into transformation properties and nothing but. when you export from mocha you have that option. FYI the Mocha Channel on Vimeo has many tutorials - you need to know the basics because it's not so friendly interface and non-native workflow makes it hard to keep track (get it?)
Thanks for your help. Here's a picture to give a better idea of what I'm trying to accomplish. You can see the kiwi on the left is squished (the left side of the face). I tracked it in Mocha AE and applied the data to a solid (precomped with a grid). It follows the kiwi perfectly, but you can see there are no corners for me to align on the kiwi. I assume I'm just misunderstanding the concepts, but I just can't wrap my head around it.
Thanks for any suggestions!
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if it's just a cleaning up so do this:
1. export a frame to photoshop
2. clean it
3. bring it back
4. attach it to a null that has the position and rotation keyframes from Mocha (choose export to transform data)
5. mask out what you need.
there might be more to it - need to examine the video and know exactly what do you want to do with this track
Track the surface in Mocha, apply corner pin tracking data, make a mask or track matte and you are done. Take a look at this:
Imagine the TV is the kiwi