Pretracking

Before analysing, you can use the Pretracking option in the Setup menu to preview the motion path for a specified number of frames. You can then adjust the tracker position, if necessary, to find the best reference point. The Pretracking option applies only to the selected tracker, regardless of whether you selected Solo, Selected, or Gang in the Tracker Selection box. If you move or resize a tracker with Pretracking enabled, the next frames are analysed.

To pretrack a clip:

1. Position and select a tracker.
2. In the Setup menu, make sure that Path is enabled. If it is disabled, Pretracking is not available.
3. Enter the number of frames to pretrack.
   NoteIf you enter a number larger than the length of the clip, only existing frames are pre-tracked.
4. Enable Pretracking.

   The motion path appears.

   NoteFrames, not fields, are pretracked. If you are in Fields mode, frames will be pretracked.

Oversampling

Use Oversampling to toggle high-quality subpixel image adjustment on and off:

• When Oversampling is off, texture memory is used.
• When Oversampling is on, a high-quality subpixel shift algorithm is used. The resulting image is sharp.

After you stabilize a clip with Oversampling on, rotoscope it in Paint to remove the border that appears at the edges. Avoid using Action (or any other component that uses texture memory) to do this because you will lose the benefits of Oversampling.