User Manual

NOTE: Once tracking or stabilization has been done, disabling these checkboxes does
nothing to alter the result. To make changes, you need to enable or disable the
necessary checkboxes first, and then reanalyze the clip.
After you’ve defined the transforms you want to use for the track, the analyze controls let you
proceed with the analysis of the subject being tracked.
 Track One Frame Reverse button: Motion tracks a single frame in reverse. Useful for
slow tracking of difficult subjects that may require frequent correction.
 Track Reverse button: Initiates tracking from the current frame backward, ending at
the first frame of the clip. Good for tracking backward when your best starting point is
somewhere within the middle of the shot.
 Pause button: Stops tracking (if you’re fast enough to click this button before
tracking is finished).
 Track Forward button: Initiates tracking from the current frame forward, ending at the
last frame of the clip.
 Track One Frame Forward button: Motion tracks a single frame forward. Useful for
slow tracking of difficult subjects that may require frequent correction.
Clip/Frame Controls
Two buttons let you set how manual adjustments to the position of tracked windows affect the
overall track.
Selecting clip or frame to apply adjustments
 Clip: The default mode, in which changes you make to the position of a window are
globally applied to the entire track. For example, if you track a feature, and then move
the window, the window moves along a motion path that’s consistently offset from the
original track for the duration of the clip. Use this mode if you’re happy with the track,
but you want to modify the window’s overall shape and position relative to the motion
path it’s following.
 Frame: In this mode, changes you make to the position or shape of a window create
a keyframe at the frame at the position of the playhead. Multiple keyframes are
interpolated to create animation with which you can manually transform a window to
solve a variety of problems. This mode is useful for rotoscoping the shape and position
of windows to match a subject that’s tough to automatically track. Frame mode is also
useful for making corrections to individual frames that were badly tracked, for animating
windows to go all the way out of frame along with a subject, or for making manual,
frame-by-frame adjustments to window position to cover untrackable sections.
The Tracker Graph
The Tracker graph provides a visual display of the tracking data that’s being analyzed. Each of
the transform controls that can be tracked has an individual curve, which lets you evaluate each
tracked parameter on its own, and each curve is color-coded to match the corresponding label
of the tracking transforms listed above.
Chapter – 121 Motion Tracking Windows 2743