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--- scripts:linux_multimedia [2021-11-06 09:06] – Tony
+++ scripts:linux_multimedia [2025-03-11 02:28] (current) – Tony
@@ Line 1: / Line 1: @@
+====== Desktop Experience ======
+===== PulseAudio modules =====
+Just making this short section to put a reference to the documentation for all modules. It lists all parameters for the different modules and might be of use.
+https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/
+===== Microphone Loopback =====
+If you're recording something and want to be able to hear something, then you can load the pulseaudio loopback module.
+To load the module and start loopback:
+<code>pactl load-module module-loopback latency_msec=1
+</code>
+To unload and stop playback:
+<code>pactl unload-module module-loopback
+</code>
+If it's looping the wrong device, you can change it using the 'pavucontrol' program.
+===== Microphone noise reduction =====
+You can use the echo-cancel module to some success. RMNoise from XiphMont is better
+<code>pactl load-module module-echo-cancel
+</code>
+===== Pipewire =====
+Pipewire is great. Instead of all the above, you can use either any PulseAudio or Jack method for both splitting outputs and microphone loopback.
+To split the output, just use Pipewire's "Pro Audio" mode. This will let you send a different stream to all the outputs individually.
+Instead of using Pavucontrol to map and manage the outputs, you can use a Jack controller, which can more easily route any output to any input.
+An example of this is to use QJackControl with Pipewire Jack instead of Jack2
+<code>pw-jack qjackctl
+</code>
+From there, you can map any program to output or input. It's so much more flexible then Pulseaudio if you want to run filters and whatnot, or you have a DAW like Ardour that you want to map multiple inputs and outputs to.
+For example, if you have an audio interface with 4 inputs, you can map it to record 4 tracks simultaneously in Ardour (or more or less, depending on what you want to accomplish).
+Microphone loopback is also a lot easier, just connect the input device directly to the output device in Jack, and you'll get monitoring with less latency then Pulseaudio.
+Now, you do pay with extra CPU cycles and memory usage, and I still find the audio starts glitching sporadically if I run both pulse and jack applications at the same time with different sampling rates, but it's neat.
+Oh, also Bluetooth is buggier - as in, sometimes it just doesn't send the audio even though it's selected as an output when first turning on, and you need to mess with settings.
+Seriously though, give it a try!