Begin with an experiment video
The video stays on this computer. Import it; source timing is read automatically when the container exposes it. Then mark the object manually or define an automatic-tracking target.
Timeline0 / 0 frames
manual anchor
automatic
review
Derived motion
Kinematics
Physics coverage —
Excluded low-confidence —
Hard gaps —
Reliable measured observations only
Hover for exact values · click to seek · wheel to zoom · drag to pan · double-click to reset · dashed spans bridge only very short low-confidence tracking dropouts
Calculation method and physical assumptions
Position is converted from pixels using the measured ruler, chosen origin and axis rotation. Velocity and acceleration come from local quadratic least-squares fits using actual observation timestamps. Predicted and low-confidence observations are never treated as measurements. A very short automatic dropout (up to two frames) may be bridged by reliable observations on both sides so one uncertain frame does not erase a much larger derivative interval; that bridge is drawn dashed. Truly missing/deleted intervals and longer unreliable runs remain hard discontinuities. Kinetic energy is ½mv².
- The camera must remain fixed, without digital or optical zoom.
- The object and reference ruler must lie in the same approximately planar depth region.
- Perspective and lens distortion are not corrected; calibrate near the tracked motion.
- The marker must represent the same physical point and the entered mass must remain constant.
- For MP4/MOV and WebM footage, source frame count and per-frame timestamps are read from the container when available, including variable-frame-rate recordings. Browser presentation-rate estimation is used only as a fallback and is explicitly identified as such.
High-throughput analysis
Batch laboratory
Load many videos, configure each experiment in one collective workspace, and let completed setups enter the parallel processing queue automatically. Review any result later in the full tracker.
Configure the next video while earlier videos track in parallel. Saved setups are queued immediately when automatic processing is enabled.
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Select an experiment
Choose a video from the left. Target placement, ruler calibration and range setup all stay here.
Queue and review
Processing status
Processed and queued experiments appear here.
Experiment files
Project
Projects retain tracking and calibration data. Videos remain separate local files.
Source video
Experiment footage
Import the original recording from this computer. H.264 MP4 and WebM offer the broadest browser compatibility.
Analysis project
Open or preserve work
Save all tracks, targets, anchors, calibration and settings into a portable .ptx file.
Efficient operation
Keyboard controls
- Space
- Play or pause
- ← / →
- Step one frame
- M
- Manual point
- T
- Tracking target
- V
- Select and correct
- Delete
- Remove current point
Browser recovery
Automatic local snapshots
Unsaved tracking, calibration, settings, and Batch setup/results are preserved in this browser while you work. If the tab or browser closes unexpectedly, Tracker Xtreme offers the latest snapshot when reopened.
Autosave ready
Source videos are not duplicated into browser storage; recovered work asks you to relink the original footage and checks its stored identity.
Selected track
Track maintenance
Clear the selected track’s observations and target without affecting the rest of the experiment.