According to the narration (sounds like Brendan Eich?) it uses emscripten; googling "emscripten h264 decoder" gives as the top result this github project (with

According to the narration (sounds like Brendan Eich?) it uses emscripten; googling "emscripten h264 decoder" gives as the top result this github project (with commits in the last hour or so): https://github.com/mbebenita/Broadway https://github.com/mbebenita/Broadway Sounds like the <whatever>monkey type inference engine is giving some pretty good results.