Question

73

Record a program's output with PulseAudio

rated 0 times [ 73] [ 0] / answers: 1 / hits: 55523 / 3 Years ago, mon, september 20, 2021, 10:59:41

I would like to record an output of a program with PulseAudio using command line/bash script. It is important not to record all output, but only the output from one specific program.

I thought I would have to create a new null-sink and than move the program's output to this new sink. Than tell parec to use this specific monitor to record.

The first step would be something like this:

pactl load-module module-null-sink sink_name=steam

But how to move the program's output now to this sink?

And how to record the specific sink with a bash script?

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answered 3 Years ago raldership · Accepted Answer

Try something like this:

In a terminal enter

pacmd

(this is the CLI of the PulseAudio-Server)
then use

list-sink-inputs

(where you get the indices of the running inputs)
Now find the index of your input. Now referred to as $INDEX

the scriptable part is:

pactl load-module module-null-sink sink_name=steam

pactl move-sink-input $INDEX steam

parec -d steam.monitor | oggenc -b 192 -o steam.ogg --raw -

Explanations:

The first command will add a null-sink as you already knew.

The second command moves the sink-input from your standard-audio-sink to steam

The third command records the monitor of the device steam (-d) and puts the output (raw-wave-stream) into oggenc, which encodes this wave-stream to an oga-file. (for mp3 use lame)