recording pulseaudio output

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recording pulseaudio output

Postby morgon » Thu Nov 21, 2019 6:34 pm


On my debian system firefox uses the pulseaudio-sink "alsa_output.pci-0000_01_05.1.hdmi-stereo".
This is what I would like to record.

So I simply tried to record the monitor-sink like this:

Code: Select all

parec --format=s16le -d alsa_output.pci-0000_01_05.1.hdmi-stereo.monitor > out.raw

And that works. However there seems to be a problem: The volume of the recording is pretty low.

However when I create a null-sink ("pactl load-module module-null-sink sink_name=whatever"), direct the firefox output to this null-sink and record that I get a recording with proper volume level.

Why do these volume-levels differ?
Why is does recording from a "regular" sink result in lower volume as opposed to recording a null-sink?

So can someone explain to me what is happening here and what the preferred way to record a pulseaudio-sink is?

Many thanks!

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