Race Timing with Integrated Replay
Instead of playing video and trying to display timing information next to it, how about we build a simulation based on timing data and become able to determine the state of the race at any given point in time based on the few 'radar blips' of sector loop passes we have? This is that. It takes the video and timing material of a 24h race (The IMSA Weathertech Sportscar Championship ROLEX24 at Daytona 2024) - 4 videos hosted on YouTube and a big CSV of laptimes and reimagines how a race replay might look like. It comes with a few non-standard visualizations, and a lot of possibilities for…
In plain words
Race Timing with Integrated Replay reconstructs a 24-hour motorsports race by combining video footage and lap timing data into an interactive simulation. Rather than syncing video with timing overlays, it uses sector pass data to determine car positions at any moment, allowing viewers to navigate the replay by race events like overtakes, pit stops, and flag changes. Built with Zig and Raylib, it demonstrates an alternative approach to broadcasting endurance racing.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Instead of playing video and trying to display timing information next to it, how about we build a simulation based on timing data and become able to determine the state of the race at any given point in time based on the few 'radar blips' of sector loop passes we have? This is that. It takes the video and timing material of a 24h race (The IMSA Weathertech Sportscar Championship ROLEX24 at Daytona 2024) - 4 videos hosted on YouTube and a big CSV of laptimes and reimagines how a race replay might look like. It comes with a few non-standard visualizations, and a lot of possibilities for navigation, including navigation based on race events such as flag states, overtakes, pit stops etc. It's a zig program based on raylib running in the browser thanks to emscripten, with a bit of js glue code to control the YouTube player. Ultimately, controlling replays is just one of the goal features of the tech stack. Live-Timing, Live-broadcast, and broadcast of sim-racing are other application areas where I see this being beneficial. Race fans, Enjoy, I know I certainly do!
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