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Record pulseaudio output to mp3 file
#!/bin/bash
# Credit: This code is based on answers provided by Waschtl and KrisWebDev
# https://askubuntu.com/questions/60837/record-a-programs-output-with-pulseaudio
# NOTE: An improved script written in python can be found here https://gist.github.com/ramast/c47bd5e57586e9c2deb74975e27089f0
cleanup(){
if [ -z "$module_id" ]
then
exit 3
fi
# Revert the input sink back to it's original value
pactl move-sink-input $index $curr_sink
# Unload the module I've previously loaded
pactl unload-module $module_id
exit 0
}
# Call cleanup function when user press ctrl+c
trap "cleanup" SIGINT SIGTERM
if ! default_output=$(pacmd list-sinks | grep -A1 "* index" | grep -oP "<\K[^ >]+")
then
echo "Can't seem to find proper output sink, are you using pulseaudio?"
exit 1
fi
pacmd list-sink-inputs|grep -E '(index|application.name)'
while read -p "Choose recording index: " index
do
if [ "$index" = "exit" ]
then
exit 0
fi
curr_sink=$(pacmd list-sink-inputs|grep -EA 8 "index: $index\b"|grep sink|sed -E 's/.*sink:\s*([0-9]+)\s*.*/\1/')
if echo "$curr_sink"|grep -qE '^[0-9]+$'
then
break
fi
echo 'Invalid index, type exit to quit'
echo '-------------------------------'
pacmd list-sink-inputs|grep -E '(index|application.name)'
done
if [ -f "temp.mp3" ]
then
read -p "temp.mp3 file already exist, replace (y/n)? " ans
if [ "$ans" != "y" ]
then
exit 1
fi
fi
module_id=$(pactl load-module module-combine-sink sink_name=record-n-play slaves=$default_output sink_properties=device.description="Record-and-Play")
pactl move-sink-input $index record-n-play
parec --format=s16le -d record-n-play.monitor | lame -r -q 3 --lowpass 17 --abr 192 - "temp.mp3"
# export my variables so that cleanup function can access them
export index,curr_sink,module_id
cleanup
@joglz8

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@joglz8 joglz8 commented Jul 10, 2017

Thank you for this. Worked like a charm on a Debian 8, xfce box. JP.

@hotpocket

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@hotpocket hotpocket commented Aug 20, 2018

Much thanks for this! I had to install lame but but it made this process painless after that.

@joelanguera

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@joelanguera joelanguera commented Feb 5, 2019

On the cleanup you really have to revert the input sink back to it's original value?
I tried just to unload the module and the input sink changed automatically.

@ramast

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Owner Author

@ramast ramast commented Jul 23, 2019

@filiagees

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@filiagees filiagees commented May 14, 2020

Very useful, thank you!

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