[scoutt]

These are old and solvable problems (audio sync). For example I'm using HDMI ARC to output the audio of my TV, and the TV has a menu to coordinate video/audio (by inserting a delay). In my case I don't need it.

But it's delay, and not integrity of the data being played back. If the network sucks and there are retransmissions, your data might still be integrous without loses (depending on the protocol).

It also happens for musicians on stage. They play and after some delay they hear their own sound back. So they use monitors to hear themselves and the rest of the band.

While in lockdown people gathered together to play music with special software. That tells you something about how this problem is well known and how it can be solved in every situation.