Track Objects Instantly in Your Browser
In Studio Space, manual object tracking normally runs on the server. You draw a bounding box around a moving object, send the job off, and wait for the server to process the clip before the track is editable. You can now run the same workflow in your browser instead, so a track is ready the moment you stop it.
Note: In-browser tracking only works on MP4 videos. For other formats, transcode the video through the VIDIZMO portal first and open the transcoded version in Studio Space.
Run Object Tracking in Your Browser
When you open the Auto Tracking dialog for a bounding box you've drawn, Studio Space shows a Client-side tracking toggle. Turn it on and the tracker runs on your own machine. Turn it off and tracking runs on the server, as before. Studio Space remembers your last choice for the next tracking job.
While Client-side tracking is running, the top ribbon shows a Tracking objects… indicator with a live progress percentage, alongside a Stop Tracking button. Each run tracks one object, so wait for the current run to finish before starting the next. Boxes appear in the timeline as soon as they're tracked, and Studio Space stays responsive. You can scrub the timeline and inspect frames while the run is still going. Selecting Stop Tracking ends the run early and keeps everything tracked so far. The whole run is one entry in the undo history, so Ctrl+Z (or Cmd+Z on macOS) reverts the entire track.
Important: Keep the Studio Space tab open and focused for the entire run. Switching to another tab or minimizing the browser stops the tracker.
The track stays in Studio Space until you select Publish, which saves it to the content. Closing Studio Space without publishing discards the track. If Client-side tracking can't run (for example, if the browser hits a runtime error), Studio Space routes the job to the server-side tracker for that one run without changing your toggle. As a last resort — when the original video is not MP4 and no transcoded MP4 rendition exists, or when the MP4 is above the in-browser size limit — Studio Space uses the original video instead of routing the job to the server.
Note: Client-side tracking always starts from the current player frame. The Start time field is read-only while the toggle is on. To track from a different frame, scrub the player to that frame, redraw the box, and start tracking again.
Sensitivity
The Sensitivity slider (between 0.20 and 0.90) controls how strict the tracker is about staying locked on the object. The default sits at the low end of the range, which works for most clips.
| Sensitivity | What happens | When to use |
|---|---|---|
| Higher (closer to 0.90) | The tracker stops as soon as it can't track reliably. Shorter, cleaner track. | Clear-edged objects (a parked license plate, a still face) where a clean stop matters more than coverage. |
| Lower (closer to 0.20) | The tracker keeps going through brief occlusions. Longer track. | Objects that pass behind something (a face behind a pole, a plate behind a car) and reappear. |
Move the slider up if the box drifts onto background after the target leaves. Move it down if the track ends too early on partial occlusions.
Prerequisites
- Ensure you belong to a group with the Redaction feature enabled, or have a Client Access License that grants this feature's permission.
Track an Object in Your Browser
- Open the video in Studio Space and pause the player on the frame where the object first appears.
- Draw a bounding box around the object on the canvas.
- Open the overflow menu (three dots) on the object, or open the context menu on the box itself, and choose Auto Tracking.
- In the dialog, confirm that Client-side tracking is on, adjust the Sensitivity if needed, and set the End time to the point where the object leaves the scene.
- Select Start Tracking. The top ribbon shows progress. Select Stop Tracking to end early.
- When the run finishes, inspect the tracked boxes in the timeline and edit any frames where the track drifted.
- Apply a redaction effect (blur, pixelate, solid color, or a redaction code) and select Publish to commit the changes.
See Also
- Step-by-Step Guide to Using Redaction Tool in VIDIZMO
- Auto Tracking of Custom Objects in Studio Space