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Chapter 2 Motion Tracking 97
What Will Not Help You
 Applying any filter to a clip or object prior to tracking
 Soloing or isolating a tracked clip. This does not speed tracking analysis.
 Adding multiple Stabilize behaviors. This does not help to further stabilize an
analyzed clip, because the tracker analyzes the original source footage and not the
result of an analyzed clip (or a filtered clip).
 Converting a track to keyframes and stabilizing again
 Selecting a tracking reference feature that does not change perspective, scale, or
rotation. The Motion tracker is designed to handle changes in perspective, scale, and
rotation very well.
What Will Help You
 Removing interlacing (fields) from the footage prior to tracking. To remove the fields
from footage, select the footage in the Media tab of the Project pane, click the Media
tab in the Inspector, then choose an option from the Field Order pop-up menu.
Note: Interlacing can be present in clips stabilized using the automatic analysis
mode in the Stabilize behavior.
 Stabilizing a clip, exporting the clip, importing the clip, then stabilizing the clip again.
 Sharpening or blurring a clip or an object with a filter, exporting the clip, importing
the clip into the same group as the original footage, tracking the filtered clip, then
using that tracking data as the source for other tracking behaviors
Note: Other filter tricks may also be helpful, such as using a filter to isolate a less-
noisy color channel of a clip or an object.
 Setting the View resolution to a lower setting, which may speed the tracking analysis
Tracking and Groups
There are a few special considerations when tracking groups.
Corner-Pinning Groups
You can corner-pin groups using the Match Move behavior. Use the following
guidelines for the best results:
 To corner-pin a 2D group, it is recommended that you turn on the Fixed Resolution
checkbox in the Group tab of the Inspector.
 To corner-pin a 3D group, you must turn on the Flatten checkbox in the Group tab of
the Inspector. If Flatten is not enabled for the group, the Four Corners option will not
be available from the Type pop-up menu in the Match Move parameters.
Once Four Corners is chosen from the Type pop-up menu, Four Corner is enabled in
the Properties tab of the Inspector, causing the group to be rasterized. For more
information on rasterization, see “Rasterization” on page 37.
Using either of the above techniques may still result in dynamic resizing. If you receive
unwanted results, export the group, import the group, then corner-pin the object.