https://github.com/mpv-player/mpv/wiki/FAQ#I_want_the_old_PulseAudio_volume_control_back_on_Linux
Version 0.7.0 will let users run custom commands, either at start up or through a keyboard shortcut. https://mpv.io/manual/stable/#list-of-input-commands Version 0.7.0 can be tested in the flatpak beta or compiling from source. The pulseaudio volume (ao-volume) can be controled through a custom command keyboard shortcut. The volume indicator in the player won't display the pulseaudio volume, though it can be displayed in an OSD message when the keybord shortcut is triggered.