track points outside footage?
by Ian Tomey
on
Aug 25, 2008 at 11:29:30 am
Hi,
I'm trying to do a perspective corner pin track, but in the footage a corner goes outside the footage. Thing is I can't drag the track point outside of the footage to estimate where it is for those frames and so im kind of stuck. Any ideas?
Re: track points outside footage? by Jerry Renes on Aug 25, 2008 at 12:26:31 pm
Hi,
In the After Effects Podcast Aharon did an episode about this I guess.
You can also change the trackerpoint within te current motion track. Just motion track using the initial point first, when the selected / tracked point goes off the screen, stop the motion track. (Delete possible faulty tracked points from when the point went off the screen. move / adjust the tracking point to a new position / point to track and finish tracking the rest of the footage.
Re: track points outside footage? by Peter O'Connell on Aug 25, 2008 at 2:04:18 pm
Hi, try moving only the little plus sign in the middle of the tracker. Also you can just directly move the cornerpin keyframes that the tracker creates. It might help as well to apply a checkerboard effect at half opacity within you cornerpin so that you can line it up visually even if points are off screen.
Hope this helps
Pete
Re: track points outside footage? by Mike Clasby on Aug 25, 2008 at 5:29:05 pm
You can keep the same trackpoint, even when it goes off-screen, by Alt-Dragging it off that point that is about to disappear off screen, Alt-drag it to a new trackpoint, and it creates the data as if it where the original. Here's a tut:
Re: track points outside footage? by Jerry Renes on Aug 25, 2008 at 9:14:56 pm
You should change the tracking point (the 2 rectangles), butt the little crosshair should stay in the same place as it was in the first section of the motion track. Or you should place it back after moving the rectangles. (I'm not sure, cannot test it nou) But then it should work.
