by Walles·VFX
Images © Walles. Used for product review; image policy.
Find Bad Tracks stands out in the Blender extensions library because it doesn't just select every suspect track the way the built-in Filter Tracks does; it ranks them by a badness score so you can filter them yourself, and it adds a duplicate-track finder on top.
Find Bad Tracks is a Blender add-on for spotting bad motion tracking tracks. It highlights tracks that move differently from the others: if most tracks travel to the right and one heads left, that single track is likely wrong and worth a human's review.
After running the tool from the Track tab in the Movie Clip Editor, you get a list of bad tracks ranked by a badness score. Clicking a track selects it in the clip editor and jumps to its worst frame, so you can step through nearby frames and see how it skips or slides. A separate Duplicate Tracks list shows pairs of tracks that come close during their lifetimes; clicking a pair takes you to a frame where they overlap so you can check whether they diverge.
Compared to Blender's built-in Filter Tracks, it uses the median rather than the average to find the midpoint, calculates a badness value from the 80th percentile of track movements instead of a fixed pixel threshold, uses the second derivative, and detects marker shape changes. Locked tracks are ignored, assuming a human has already vetted them.
Find Bad Tracks is best for motion tracking work in Blender where you want to identify and review suspect tracks before solving the camera.
Find Bad Tracks is completely free to download and use.
Find Bad Tracks is compatible with Blender 4.2 LTS and newer, so it fits into current Blender releases. Once installed and enabled, you'll find it in the Motion Tracking workspace under the Track tab in the Movie Clip Editor, where a Find Bad Tracks section appears; if you don't see it right away, scroll down within that tab. Because the add-on lists 4.2 LTS and up as its supported range, older Blender versions may not run it. Check the developer's page on GitHub for the current version and any compatibility updates.
Find Bad Tracks lives in the Motion Tracking workspace, inside the Movie Clip Editor on the middle left of the screen. Select the Track tab, expand the Find Bad Tracks section, and press the Find Bad Tracks button once you've collected some tracks. A list of bad tracks appears below the button with each track's badness score, and clicking a track selects it in the clip editor and jumps to its worst frame. Stepping a few frames left or right from there shows how the track skips or slides.
Find Bad Tracks works similarly to Blender's built-in Filter Tracks, but with some differences. It uses the median to find the midpoint, which is resilient to outliers, while Filter Tracks uses the average. Instead of a fixed five-pixel threshold, Find Bad Tracks calculates a badness value from the 80th percentile of track movements, which works on both fast and slow moving frames. It also uses the second derivative, catches marker shape changes, lists tracks ranked by badness so you can filter them yourself, and finds duplicate tracks.
Find Bad Tracks installs through Blender's add-on system. You can drag and drop it into Blender, or download the file and use Install from Disk. To install it manually, open Preferences under the Edit menu, click Add-ons, click the Install button, locate the downloaded file, and click Install Add-on, then check the box next to Video Tools: Find Bad Tracks to enable it. On newer Blender versions you can also install it through Extensions using the Install from Disk option in the settings dropdown.
Find Bad Tracks is listed as free here in the catalog. It's released under the GNU General Public License v2.0 or later, and the extension does not require special permissions. For the current version, licensing terms, and any updates, check the developer's page on GitHub. The listing shows version 1.0.2, which brought minor bug fixes and added tests for the badness scoring in that release.
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