Navigation¶

Moving between frames¶

Action	Shortcut
Next / previous frame	`Right` / `Left`
± 10 frames	`Cmd`+`Right` / `Cmd`+`Left` (`Ctrl`+`Right` / `Ctrl`+`Left`)
± 100 frames	`Cmd`+`Shift`+`Right` / `Cmd`+`Shift`+`Left` (`Ctrl`+`Shift`+`Right` / `Ctrl`+`Shift`+`Left`)
First / last frame	`Home` / `End`
Go to Frame…	`Cmd`+`J` / `Ctrl`+`J`
Select to Frame…	`Cmd`+`Shift`+`J` / `Ctrl`+`Shift`+`J`

Scrubbing frame by frame through a 30-minute video is not a workflow. These jump straight to the frames you care about:

Target	Shortcut
Next / previous labeled frame	`Alt`+`Right` / `Alt`+`Left`
Next / previous user-labeled frame	`Cmd`+`U` / `Cmd`+`Shift`+`U` (`Ctrl`+`U` / `Ctrl`+`Shift`+`U`)
Next / previous suggestion	`Space` / `Shift`+`Space`
Next track spawn frame	`Cmd`+`E` / `Ctrl`+`E`
Last interacted frame	`Cmd`+`A` / `Ctrl`+`A`

"User-labeled" excludes frames that only carry predictions — useful when you want to review your own work rather than a model's.

"Track spawn" frames are where a new track identity first appears, which is where tracking errors usually originate.

Three options in the Go menu restrict what Right / Left step through:

Navigate All Frames — every frame in the video
Navigate Labeled Frames Only — skip everything unlabeled
Navigate Imaged Frames Only — only frames whose pixels are actually present (useful in .pkg.slp projects with a sparse set of embedded images)

Drop a mark on the current frame with Cmd+M / Ctrl+M and come back to it with Cmd+Shift+M / Ctrl+Shift+M.

The bar under the video is more than a scrubber:

Tracks ▸ Seekbar Header plots a per-frame statistic behind the seekbar, so you can see where a video gets hard:

Graph	What it shows
Instance Count	How many instances are on each frame
Point Displacement	How far points moved from the previous frame
Primary Point Displacement	The same, for the skeleton's first node only
Tracking Score	Confidence of the track assignment
Instance Score	Model confidence per instance
Point Score	Model confidence per point
Number of predicted points	Predicted point count per frame
Min Centroid Proximity	How close together the closest two animals get

Where several of these have a reduction (sum, mean, max, min), the app keeps your choice when you switch graphs if the new graph supports it.

Spikes in point displacement and dips in min centroid proximity are where tracking breaks — jump there and check.

Projects can hold many videos. The Videos panel lists them; switch with:

Action	Shortcut
Next video	`Alt`+`Shift`+`Right`
Previous video	`Alt`+`Shift`+`Left`

See Videos for adding, replacing, and resolving them.