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Tracker Size/Aspect Details
When SynthEyes goes to track a specific frame, it interpolates the size/aspect keys to determine the values on that frame. That same size is used to determine the reference pattern from the reference frame also, ie the same number of pixels are compared between the two frames. The images are not rescaledthis is the key difference between normal trackers and planar trackers. Using the same subimage size is simpler, faster, and avoids resampling errors..
If the feature being tracked is dramatically different sizes between the two images (search and reference), tracking will be less accurate or even fail. This could occur in a long push-in or pull-back shot.
Accordingly, if you are animating the tracker size, you should be sure to set new tracker position keys regularly, for example using Key Every. That way the difference in scale never be that large.
If this is an issue, you should use a planar tracker.
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