Some Tesla event videos are recorded in a format called H.265 that most browsers can't play directly. When that happens, this viewer converts them to a compatible format (H.264) right on your computer.
It does this using FFmpeg - a widely trusted, open-source video tool that's been around since the year 2000. We run it through something called WebAssembly, which is basically a way to run powerful software inside your browser without installing anything. Think of it like a virtual machine in your browser tab.
The FFmpeg engine is loaded from files sitting right next to this page - not from any remote server. You can preload it from the landing page if you want fully offline support.