In the Behaviors Inspector, click the track’s disclosure triangle to display the Search Size parameter, then increase the value.

In the Behaviors Inspector, click the track’s disclosure triangle to display the Fail Tolerance parameter, then decrease the value. With a lower Fail Tolerance value, the tracker is more likely to find a false match. With a higher value, the tracker is more strict in finding a match.

Move the playhead to midpoint frame of the clip, and click Analyze in the Behaviors Inspector to track forward to the end frame of the clip; then return to the midpoint frame, click the Reverse checkbox in the Behaviors Inspector, and click Analyze to track backward to the beginning of the clip.