How do I set up "Recording in mono" use-case.

Question

Hi,

Record_from_DMIC.sh says:

# The following command should be used to test

# arecord -Dhw:sndrpiwsp -r 44100 -c 2 -f S32_LE <file>

And it does. Lovely. However how do I record only a single channel? "-c 1" doesn't work:

pi@raspberrypi ~ $ arecord -Dhw:sndrpiwsp -r 44100 -c 1 -f S32_LE out.wav

Recording WAVE 'out.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, Mono

arecord: set_params:1087: Channels count non available

I did try naively commenting out bits of Record_from_DMIC.sh to eliminate everything about the "R" channel, but that didn't work.

Lastly - can someone confirm that this is the best arena for me to learn about this device? (the raspberry-pi B+ model).

Thanks.

James.

e14 Contributor · Accepted Answer

You can't record just one channel directly from the card. It will insist on two channels. That can be worked around by using my .asoundrc file, described here . -- Ragnar