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Forums Adobe After Effects motion tracking is ticking me off!

  • motion tracking is ticking me off!

  • Mike Morris

    December 11, 2007 at 1:36 pm

    Maybe I am just a moron…

    But I am trying to track a computer screen that comes into screen on a pan and tilt motion. It enters in from the lower left, and I need to Corner Pin a new image to it. Sounds simple enough, right?

    Wrong.

    I realize that Motion Tracking has its limits, those of which are blatantly obvious in my attempts to do this. The problem that I am yet to resolve is that the top corners come into screen before the bottom corners do. Furthermore, the top right comes in way before the top left one does.

    How on earth can I track the screen so that the image doesn’t jump around all screwy? I have tried several methods of tracking each individual point, setting an expression to a simple corner pin effect to come and follow that point at that given time… And still… nothing.

    Any insight would be greatly appreciated. I have a deadline of today at 4:00 (mountain time), and am panicked about how to resolve this situation.

    Thanks.

    Sib Ntsib Dua

    Xeeb

  • sam moulton

    December 11, 2007 at 2:19 pm

    it’s probably too late now but the easiest way to do this is to track from where you see all corners, then go back and add a few keyframes by hand. If the camera movement is relatively smooth you can probably get it to work right with three or four keyframes.

    This is the kind of stuff that Moca is perfect for

  • Don Sciore

    December 11, 2007 at 4:11 pm

    What works well for me is this:
    Pre-comp the layer you want to track.
    Then open the pre-comp and enlarge the comp so that it is large enough to accommodate the monitor if you could see it go off screen.
    Then back in your original comp, motion track the precomp.
    You are going to set Options to Extrapolate, Use perspective corner pin, and analyze backwards. Since the pre-comp layer is larger sitting inside of a smaller Comp, AE has room to extrapolate the motion off- screen Usually works like a charm.
    AE actually does this quite well.
    Good Luck
    Don

  • Jeremy Allen

    December 11, 2007 at 10:00 pm

    I’m probably too late too, but Andrew Kramer uses a nice technique for tracking objects off screen…

    https://www.videocopilot.net/tutorials.html?id=16

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