Apple Motion 5.1.1 - Manual (Page 961)

Chapter 22 Motion tracking 961
4 To add trackers, click the Add button in the Behaviors Inspector.
Each new tracker is added to the center of the footage.
5 Drag the additional trackers to the reference points you want to use.
6 To track a specific range of frames, adjust the start and end points of the purple tracking
behavior bar in the Timeline or mini-Timeline.
Note: If you adjust the length of the tracking behavior bar, make sure to set your tracking
reference points within the range of the behavior.
7 Click the Analyze button in the HUD or Behaviors Inspector.
When the tracking analysis begins, a progress window opens, and track points appear on a
motion path in the Canvas. The track point at the current playhead position is emphasized.
The tracking keyframes contained in the behavior appear in the Keyframe Editor. (If the Keyframe
Editor is not visible, click the Show/Hide Keyframe Editor button in the lower-left corner of the
Motion project window.)
Confidence curve
Y position curve
X position curve
Because the Analyze Motion behavior does not transform the source object, only the tracking
keyframes appear in the Keyframe Editor. When using a Match Move or Stabilize behavior, the
tracking keyframes appear as well as the transform curves of the source object (for Stabilize) or
destination object (for Match Move).
A confidence curve is also displayed in the Keyframe Editor. This curve provides a visual
indication of the tracker’s accuracy relative to its parameter settings in the Inspector. The
confidence curve is not for editing purposes.
8 To stop a track analysis, click the Stop button in the progress window or press Esc.
Tip: If the tracker loses its reference pattern, do not click the Stop button. Allow the analysis to
continue for a few seconds. When the tracker fails, the playhead jumps to the exact frame where
the track was lost.
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