PulseAudio configuration to stream video files and microphone audio to v4l2sink; locally hearing the video files but not the microphone.

pavusetup.sh

#!/bin/sh

# PulseAudio configuration to stream video files and microphone audio to
# v4l2sink; locally hearing the video files but not the microphone.

# Video files -> OBS -> OBS Monitor -> "MediaInterim" \
#                                                     |-> Speakers
#                                                     `-> "FinalStream"
#                                           Microphone -> "FinalStream"

pacmd load-module module-null-sink sink_name=FinalStream sink_properties=device.description="final_stream"
pacmd load-module module-null-sink sink_name=MediaInterim sink_properties=device.description="media_interim"

# Microphone to Stream
# Find your microphone source with `pactl list short sources`
pactl load-module module-loopback latency_msec=1 adjust_time=3 source=alsa_input.usb-046d_HD_Pro_Webcam_C920_685B4A2F-02.analog-stereo sink=FinalStream

# Media to Stream
pactl load-module module-loopback latency_msec=1 adjust_time=3 source=MediaInterim.monitor sink=FinalStream
# ... and also to Speakers
# Find your speaker sink with `pactl list short sinks`
pactl load-module module-loopback latency_msec=1 adjust_time=3 source=MediaInterim.monitor sink=alsa_output.pci-0000_00_1b.0.analog-stereo

echo "Don't forget to direct media players to media_interim, and record stream audio from final_stream!"
echo "Teardown: pacmd unload-module module-loopback; pacmd unload-module module-null-sink"