This is my third time attempting motion tracking in after effects and oh boy was it a success. I'm working on an underwater camera app that lets you know when you have crabs in your crab-pot, so that you know when to pull the cage up from the sea floor. Anyway, motion tracking:
1. Get some footage that will be easy to work with, it needs to have smooth camera movement, distinguished color, and be in focus with easy points to locate and track. You can pirate this video if you know how.. or email me kevenmt@gmail. I'll send it to ya or maybe you can show me a good way to make this file downloadable.
2. Now you need to figure out what your going to be laying over your footage. In this case we're laying iphone app screens on top of an Iphone. I made my app screens using a prototyping tool called Pixate. It's a great tool for showing how micro interactions will work within an app idea. After I had the app made in Pixate, I used this tutorial to turn my Iphone screen interactions into a video using OS Yosemite and Quicktime (pretty rad). The key here is that you have footage that is the exact size as the Iphone screen which is 1334-by-750-pixel resolution at 326 ppi. Once you have both the base footage and the footage your laying over the base; you'll be ready for the next step.
3. Open After Effects and bring your footage together in the same comp. Name the base layer "base" and the iphone screens "screens". (1)Poke the eyeball of the layer "screens" so that your only seeing the base layer. This footage is what we're going to track. Go up to the menu bar, click window and bring up the Tracker Panel. I suggest (2)smoothing the footage first with Warp Stabilization. Then hit the (3)"Track Motion" button and select the option (4)"Parallel Corner Pin" under the tracker type. We're using this option because the bottom left corner of the iphone will be hard to track because this guy's fat fore thumb is in the way a little bit. so make sure the hot point with the dotted lines goes to the most difficult corner to pin.
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4.(1)Get those hot spots set on each corner of the iphone. When you have them in a satisfied location go over to the analyze section and (2)hit the play button. This will analyze the footage and track the motion so that you can lay your iphone screen in there. After that's done click on (3)"Edit Target" and set the target to the "screens" layer. (4)Hit "APPLY", poke that eyeball right square in the face, and you should have your self a decently tracked Iphone with some decently made App Screens layed right that mother.
