I’ve used macast in the past on my desktop where it worked perfectly. Unfortunately I could not find a fitting docker image for it. There is this one but it has literally no information and only 70 image pulls. Then there is a dockerfile in the Macast github repo but considering I don’t see a docker image mentioned anywhere in the documentation so I guess that one is only for building the application. I believe Macast is a GUI application anyway so I’m not sure how good it would work on a headless server.