Video-playback is not supported.
The github has some notes (in error) and a PR request that someone added of his gathered notes, but it’s not in the dev.twitch.tv documentation because it’s not supported for use by third parties and can and will change at any time, or just not work™.
With 11k users theres probably a better way than using pubsub to determine live status, but I’m not doing your work for you… 