I have my own Plex server with a couple Chromecasts hooked up throughout my apartment (two televisions and one connected to an HDMI port on my stereo for audio-

I have my own Plex server with a couple Chromecasts hooked up throughout my apartment (two televisions and one connected to an HDMI port on my stereo for audio-only). It works fantastically well, allowing me to switch where things play-back as I move from room to room. And, like you said, it's linux, so I can do what needs to be done in regards to automating / organizing my media collection.