Clarification: I normally physically log on to and play media on host A using mpv, displaying the video on an external monitor HDMI-A-2 and playing the audio from host A’s headphone jack connected to external speakers. Today, I tried not physically logging on to host A, but remotely logging in from host B (my phone) using ssh from the same network and running the mpv command from host B. mpv then displays the video on the expected display HDMI-A-2, but it doesn’t play any audio.
Symptomatically, if I haven’t logged on physically to host A, mpv only displays video, plays no audio and throws errors. Why do I need to be logged in on host A for mpv to be able to access audio? You’d think a video feed would be more guarded than an audio one. But maybe this isn’t about security at all? Please enlighten me! 😊
I think that’s distinct from what the user is trying to do. They are trying to play audio and video on the machine that’s running the ssh server, by outputting video over HDMI from the graphics card and sound over the 3.5 mm jack. There’s no X forwarding to the ssh client going on.