Tracker Files

Tracker saves properties of the video clip, coordinate system and tracks in xml-based tracker files with the extension "trk". When a saved tracker file is opened, Tracker loads the specified video, sets the clip and coordinate system properties, and creates new tracks with the specified identification and step positions.

Step positions are saved in image (pixel) coordinates, so they are not suitable for direct analysis. To access the world data associated with a track, use a datatable view.

1. Opening a tracker file

Bring up the open dialog with the Open button or menu item, select the desired file, and click Open.

Tracker opens the file in a new tab that displays the file name.

2. Saving a tracker file

Save changes to an open tracker file by clicking the Save button or File|Save menu item.

Save a new tracker file by choosing the File|Save As... menu item. Tracker will automatically assign the file a "trk" extension.

3. Importing from and exporting to a tracker file

Videos, tracks and/or the coordinate system from a tracker file can be imported into an existing tab using the Import menu item from the File menu. Selected tab elements can also be exported to a tracker file using the Export menu item.

When importing or exporting a tracker file, the available elements are displayed in a dialog that allows the user to select those desired.

4. Editing a tracker file directly

A tracker file is easily human-read and edited with any text editor. The xml format conforms to the doctype specification defined in osp10.dtd.