Old version showed inter-fly distance plots and asked the analyst to
click a timeline. The new version reads frames directly from the .mp4
and shows a 10×6 grid of timestamped thumbnails — the analyst just
clicks the frame where the barrier opens.
Two-stage refinement:
- Coarse grid: 60 thumbs spanning the 5-min search window at ~5 s
spacing. Pick the rough moment.
- Fine grid: 60 thumbs at 0.2 s spacing centred on the coarse pick.
Pick the exact frame.
Auto-detector still feeds the starting position. Sequential video
decode (one cv2 pass through the relevant range) instead of seek-per-
frame, so each grid loads in a few seconds.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Giorgio Gilestro
e8c7f23d4d