As you may be aware (or you may not - we all lead busy lives) one of GNOME's Google Summer of Code projects for this year (2023) was to add support for
The developer working on integrating network display functionality into GNOME Shell shared short video clip to the GNOME sub-reddit [...] the feature adds a “screencast” button to the row of actions in the Quick Settings menu. Clicking this opens a modal picker where the user can select any Miracast or Chromecast compatible displays on the network.
I think its really great. Im using the server component together with spotifyd and then have the clients running on a few different devices. The sync is really good and you can adjust the delay of each device in the web interface. I mostly needed that because of a bluetooth speaker and a sound receiver which delays always by 250ms no matter the input. But now i have music blasting from every room and you can ealk from room to room and dont hear any delay. You can even have different soundsystems in the same room and it is not even noticable that there are different devices playing. I totally recommend it for a music multiroom setup.
On my main pc i've even added it as an audio output device with pipewire :)
alt here since world down:
sadly this doesn't work with movies. snapcast always adds delay to sync up all clients. so your video and audio are out of sync. I think i remember that somewhere people discussed that snapcast could report the delay to the pipewire to have the video player sync it back up again. but that isn't implemented "yet" tm
What speakers/ receiver system are you using? I'm still shopping that part as well. I'm trying some wifi speakers but haven't got them where they need to be yet.
Just whats been around tbh. Some old speakers with a cheap bluetooth amplifier board f.e. One of my flatmates added his PC speakers with subwoofer and we got a sourround system running along side it. Didn't spend anything just connected whats been already around.