…or label your own clip with the Video picker (top-left).
It downloads and opens in the player automatically, ready to mark.
New here? Labeling is a 4-step loop
Load a video (the “Video” picker, top-left). Its fps is auto-detected from the video — just confirm it in the Clip metadata panel below.
Scrub to the contact frame — the exact frame the racket meets the ball. Drag the time bar under the video to move fast, jump ±1s with ⇧←/⇧→, then fine-tune with ←/→ (±1) and ,/. (±5).
Press Enter to mark a shot at that frame.
Tag it with one key each: player 1–4, stroke q w e r …, spin 7–0, outcome u i o p … (see the cheatsheet →).
Repeat for every shot, then Export JSON and save it into labeling/labels/. Your work autosaves locally as you go. This box disappears once you load a video.