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DeGlitch Mode
You can also repair the glitch by switching to the Deglitch mode
of the graph editor, then clicking on the first (positive) peak of the U velocity at frame 217. SynthEyes will compute a new tracker location that is the average of the prior and following locations. For most shots, this will eliminate the spike.
If you see a velocity spike in one direction only, it will be more difficult to correct: it means that the tracker has jumped to a nearby feature, and not come back. You will have to put it back in its correct location and then play (track) through the rest of the shot.
The deglitch tool can also chop off the first or last frame of a tracker, which can be affected when an object moves in front, or a feature is moving offscreen. Even if the last two or three frames are bad, you can click a few times and quickly chop them off.
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