[okdjnfweonfe]

https://getmetastream.com/ is an also-FLOSS alternative, instead of a server, it syncs site interactions (e.g. opening up the same video on each person's browser, and then automatically hitting play, seek, etc)

So, pros and cons of each approach

[rp1]

How does this approach handle different internet speeds? Video playback will be out of sync if buffer times differ.