Thanks, this fixes the build for us after upgrading pyparsing>=3.0
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Pressing "Apply" in Audio Output settings will restore audio output, but it will stop working again after a while. Usually in the range of minutes for me. Tried with both Mumble 1.3.4 and 1.4.0-dev-snapshot-005.
Seems like it reopens the audio device. When I can't hear anything I don't see any signal level in the playback tab for PipeWire ALSA [.mumble-wrapped]
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Edit: Since today we have a music bot, botamusique, in our mumble. The output reproducly breaks when pausing a track.