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The automatic tracker works best on relatively well-controlled shots with plenty of consistent spot-type feature points, such as aerial and outdoor shots. Very clean indoor sets with only line features can result in few trackable features, be sure to turn on the Corner detector on the Summary panel. A green-screen with no tracking marks is un-trackable, even if it has an actor, since the (moving) actor does not contribute usable trackers.
Rapid feature motion can cause tracking problems, either causing loss of continuity in blip tracks, or causing blips to have such a short lifetime that they are ignored. Use the Crash Pan motion profile to address such shots.
Similarly, situations where the camera spins about its optic axis can exceed SynthEyes expectations.
You can add supervised guide trackers to help SynthEyes determine the frame- to-frame correspondence in difficult shots (in Low Detail mode). A typical example would be a camera bump or explosion with several unusable frames, disabled with the Skip Frames track. If the camera motion from before to after the bump is so large that no trackers span the bump, adding guide trackers will usually give SynthEyes enough information to reconnect the blip trails and generate trackers that span the bump.
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