Ask Ubuntu Asked on December 25, 2021
I run the following command to capture the output of audio into a file:
$ sox -t pulseaudio alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -t mp3 test.mp3 silence 1 0.1 3% 1 3.0 3% > /dev/null
Input File : 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor' (pulseaudio)
Channels : 2
Sample Rate : 48000
Precision : 16-bit
Sample Encoding: 16-bit Signed Integer PCM
In:0.00% 00:00:18.09 [00:00:00.00] Out:0 [ | ] Clip:0 ^C[C
As you see, while I tried to send the output to null, it stills show messages about the progress and status of recording!
I want it to record in background without showing these messages so that I can have the terminal prompts….
I checked sox
for a log file but didn’t find
sox
has -q
option if you don't want to see the messages.
You also forgot to specify what you want to send to /dev/null
. It must be 1
(STDOUT
), 2
(STDError
) or &
or 1&2
meaning both. check What does 2>/dev/null mean?
If you want to run the command in background add &
at the end of command.
So it must be one of the followings:
sox -q -t pulseaudio alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -t mp3 test.mp3 silence 1 0.1 3% 1 3.0 3% &
OR:
sox -t pulseaudio alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -t mp3 test.mp3 silence 1 0.1 3% 1 3.0 3% &>/dev/null &
Answered by Ahmad on December 25, 2021
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