Get this working with Pipewire about pa_volume

[acheronfail]

I've just discovered a way to do this via the command line with pipewire:

$ pw-cli ls Node
# This will output a list of nodes... find the one you want, it will have `media.class = "Stream/Output/Audio"`
# To change its volume:
$ pw-cli s <id_from_prev_command> Props '{ mute: false, channelVolumes: [ 1.0, 1.0 ] }'

(Where channelVolumes are percentage values from 0 to 1)

See this link for more: https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Migrate-PulseAudio#sink-inputsource-output-volumemute

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While it's good to have a way to do this, pw-cli's output isn't that nice to parse, and I need to confirm if it remembers the volumes like pulseaudio

[acheronfail]

I've discovered another pipewire utility: pw-dump which outputs everything as a JSON object, which allows finding the node more easily, something like:

$ id=$(pw-dump | jq '.[] | select(.type == "PipeWire:Interface:Node") | select(.info.props["application.name"] == "mpv") | .id')

And then the volume can be changed with the pw-cli command I mentioned above.