Issue: When using MPD and MPV using PipeWire/Wireplumber, adjusting the audio levels of MPD implicitly sets the the init-volume of MPV when playing music.

Update 2024.05.07

Wireplumber updated and made all previous .lua config files incompatible with the new version. Great.

Thanks to the Wireplumber git repo and this post, I got the config working again.

If you didn't have a "main" configuration file before, copy over the defaults:

> cp /usr/share/wireplumber/wireplumber.conf ~/.config/wireplumber

Create the new "extra" config directory:

> mkdir ~/.config/wireplumber/wireplumber.conf.d

Then create ~/.config/wireplumber/wireplumber.conf.d/51-mpv-fix.conf with the following content:

stream.rules = [
  {
    matches = [
      {
        application.name = "mpv" 
      }
    ]
    actions = {
      update-props = {
	      state.restore-props = false
      }
    }
  }
]

Outdated/Original Post

A workaround for this issue is as follows, which will make MPV start with 100% volume each time:

Create a file .config/wireplumber/main.lua.d/51-mpv-fix.lua with the following content:

stream_defaults.rules = {
	{
		matches = {
			{
				{ "application.name", "matches", "mpv" },
			},
		},
		apply_properties = {
			["state.restore-props"] = false,
		},
	},
}