Analyze
Playback and tools
Slow motion, frame stepping, A–B loops, zoom, drawings, measuring in metres, snapshots and exporting a stroke as a video.
On this page
Everything you need to look at a stroke calmly: slow motion, frame stepping, loops, zoom, drawings that stay stuck to the picture, and exporting the stroke as a video to share.
Playback#
The controls are under the video:
- Previous / next shot (Shift+← Shift+→), previous / next frame (← →) and play / pause (Space or K).
- Playback speed: 0.05×, 0.1×, 0.25×, 0.5×, 1× or 2× (also with ↑ ↓). Below 0.25× the app steps frame by frame so slow motion stays smooth.
- J and L go back or forward one second.
- Rallies only (R) skips the time between rallies.
Below are two timelines: the frame-by-frame bar, which you can drag and zoom with the wheel (the playhead always stays in the middle; the hatched area is before the start or after the end of the video), and one for the whole video, with hits and rallies marked. Each of your strokes has its type’s colour (the same as in the strokes bar) and other people’s hits are faint; hover over a mark to see what it is. The light-blue band is your stroke, the one every tool uses.
The panel on the right (Session, Shots, Pros…) can be made wider or narrower: drag its left edge (or, with the edge focused, use ← →). The video takes the rest. Double-click the edge for the normal width; the app remembers the width you choose.
On a narrow screen the loop and Rallies only buttons show only their icon; hover over them to see what each one does.
Loops#
Set the In with I and the Out with O, and turn on Loop with \. The In–Out selection also defines the stroke for the AI coach, the Pros tab, the body analysis and exports.
Zoom#
Scroll over the video to zoom in and drag to pan. Z goes back to the full view. Body tracking follows the zoomed area, and drawings stay in place.
Drawing#
The tool rail on the left:
| Tool | Key | What for |
|---|---|---|
| Select / pan | V | Select and edit drawings; when zoomed, drag to pan |
| Line | 1 | Shows its angle from horizontal (and its length when calibrated) |
| Angle | 2 | Three clicks: end, vertex, end |
| Arrow | 3 | Point out a direction |
| Circle | 4 | Drag from the centre |
| Pen | 5 | Freehand |
| Eraser | E | Click or drag over drawings and ball paths |
| Mark ball | B | Mark the ball by hand (see Ball analysis) |
| Calibrate | G | Trace a line of known length |
Pick the colour on the same rail. A drawing shows for about a second around the frame you drew it on; pin it in the Video tab to keep it on every frame. To delete: select it and press Delete, use the eraser, or Clear visible / Clear all. ⌘Z or Ctrl+Z undoes.
Measuring in metres#
With Calibrate (G) trace a court line of known length on the video, for example the service line (8.23 m), and pick which one it is. From then on lines show their length in metres and speeds are given in km/h. Measurements are most accurate for what happens in the same plane and at the same distance from the camera as that line.
For proper 3D ball measurement, use Calibrate the court.
Saving a picture#
The camera button on the tool rail saves the current frame, with drawings, as a full-resolution PNG.
Exporting a stroke as a video#
The download button on the playback bar (Export) makes a video to share:
- Pick the clip. The In–Out selection or a few seconds around the playhead.
- Pick the speed. 1× is real time; 0.25× shows the stroke in slow motion.
- Pick the resolution and whether to include the skeleton, angles, drawings and ball.
- Press Export. The video is made on your computer and downloads as an MP4. Keep the tab open until it finishes.
In Compare, the same button exports both videos side by side, synced as you see them. Exports are at most 120 seconds long.