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I sometimes stream games for my friends on Discord, but Discord for Linux is unable to capture the game sounds. I use Pulseaudio + ALSA combo for my sound needs. I thought of solving this issue by making virtual source device, which would combine the sounds from my microphone and the output of my computer. My best shot looked like those commands:

pactl load-module module-null-sink sink_name=loopback
pactl load-module module-loopback source=alsa_input.pci-0000_00_1b.0.analog-stereo sink=loopback
pactl load-module module-loopback source=alsa_output.pci-0000_00_1b.0.analog-stereo.monitor sink=loopback

The idea was that I would be able to slect this device as an input from discord. Sadly there seem to be two problems with my attempt. First the loopback doesn't implicitly mix the two audio sources and only binds itself to the last one. Second Discord doesn't recognize loopback as input, probably because it is audio sink despite having loopback.monitor source.

Is there a way to do what I'm trying to do, or at least something similar?

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  • askubuntu.com/questions/868817/… <- try a variant of this.
    – gl00ten
    Mar 27, 2020 at 3:20
  • I assume Discord doesn't show the "monitor" virtual sources either? (Because that's literally how you'd do it normally -- capture from the sink's ".monitor" source...) Mar 27, 2020 at 6:35

2 Answers 2

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The automatic monitor that is created is not recognized by a lot of programs as a source. Try remapping the source:

pactl load-module module-remap-source master=alsa_output.pci-0000_00_1b.0.analog-stereo.monitor source_name=virt_mic source_properties=device.description=VirtualMic

That should show up in Discords list

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You can manually reassign the sink to use in the Recording tab of pavucontrol.

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  • Does not work if the application set custom sink along with sink_dont_move: monitor devices aren't usually listed by applications when selecting input device (eg. Zoom)
    – idontknow
    Jan 17, 2021 at 20:52
  • In the case of Zoom you can just pick the device on the app itself.
    – sean
    Jan 18, 2021 at 21:13
  • Zoom does not show monitor devices, unfortunately.
    – idontknow
    Jan 18, 2021 at 22:25

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