Volleybot

github.com/rextlfung/volleybot

Automatic volleyball video editing toolkit. Detects rallies in fixed-angle amateur footage and cuts out the dead time between points, turning a full game recording into a highlight reel of serves, rallies, and kills.

• Detects the volleyball in each frame using a YOLOv8 model fine-tuned on ~500 labeled frames from 3 different gyms, beating a pretrained YOLOv8x baseline by +17pp detection rate while running 6x faster
• Segments the video into rally windows with a detection state machine, refined by a frame-level live/dead classifier for precise rally boundaries
• Cuts and concatenates each rally into a single highlight reel using ffmpeg

Ball tracking

The fine-tuned YOLOv8 detector locating the volleyball frame-by-frame in fixed-angle gym footage.

Live vs. dead play discrimination

The frame-level classifier telling live rally play (green) apart from dead time (red) — this signal drives which parts of the game footage get kept in the highlight reel.