SecondCall

Problem. In sports with judges, calls happen in a split second and people argue about them all the time. Friends and parents film every game, but those videos just sit in our camera rolls. We started with kendo because we both do it: a point only counts if the shout, the strike and the stomp all land in the same quarter-second. What it does. Drop in a match video and SecondCall judges each strike: POINT, NO POINT or CAN'T TELL, with how sure it is and the proof. It also catches penalties (hansoku) and points the referees might have missed. How it works. First it listens: the stomp and the shinai crack tell us exactly when the strike happened, and NVIDIA Canary hears which target was called. YOLO11 zooms in on the two players and blocks out the referees, then NVIDIA Cosmos looks at the frames around that moment. A rule card turns all that into a verdict, W&B Inference explains it in plain words, and Weave tracks every step. The app never sees the referees' flags, so it can't be swayed by them. Rulings live in VastDB, matches are searchable in VAST Video Search & Summary, and it all runs on CoreWeave GPUs. Beyond kendo. Every sport is just a new rule card, so it works for judo, fencing, pickleball line calls, or any sport where calls get argued. What we learned. Plain 5-second clips kept missing the strike. Listening for the moment first, then showing Cosmos close-up frames, fixed it. Limits. It's a second opinion, not a replacement for referees. Built with Cursor.