Issues with arecord command: Channels count non available

Question

I'm having some mixed results with the arecord command in the terminal. The hardware I'm using consists of the Cirrus Audio Card for the Raspberry Pi. I'm trying to record a 24-bit 192kHz sound (from the onboard MIC) into a WAV file, and then play it back (through the headset). First I make sure to enable the MIC and headset:

$ ./Record_from_DMIC.sh
$ ./Playback_to_Headset.sh

Then I tried multiple commands, and got mixed results.

$ arecord -f S24_LE -r 192 -d 20 test.wav
Recording WAVE 'test.wav' : Signed 24 bit Little Endian, Rate 192000 Hz, Mono
$ arecord: set_params:1087: Channels count non available
# So I set the number of channels to 1 (even though it is that, by default)
$ arecord -c 1 -f S24_LE -r 192 -d 20 test.wav
Recording WAVE 'test.wav' : Signed 24 bit Little Endian, Rate 192000 Hz, Mono
arecord: set_params:1087: Channels count non available

Still get the same error. I got rid of the rate (192kHz), and let it default:

$ arecord -d 10 -c 1 -f S24_LE -t wav test.wav
Recording WAVE 'test.wav' : Signed 24 bit Little Endian, Rate 8000 Hz, Mono
$ arecord: set_params:1087: Channels count non available

Still getting the same error. So I just used an example run of the command I found online (http://linux.die.net/man/1/arecord):

$ arecord -d 10 -f cd -t wav test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

This worked. But clearly used different values than from what I wanted. I also had trouble playing at 192kHz:

$ aplay -c 1 -r 192000 test.wav 
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

I try to play at 192kHz, but it goes down to 44.1kHz. Does anyone have any idea as to why I'm getting all these weird errors and results?

Solution

I found out what the problem was. The command defaults because I wasn't specifying a 2-channel (stereo) 192kHz audio input. Here's an example of a command that did work:

$ arecord -f S24_LE -c 2 -r 192000 -d 20 test.wav

The -c 2 is what fixed my commands.

Comments

[CL.]

What is the output of aplay --dump-hw-params and aplay -D hw:0 --dump-hw-params?

[Max Jacob]

I get this for either command: aplay: unrecognized option '--dump-hw-params' Try 'aplay --help' for more information

[Max Jacob]

Doesn't stereo specifically refer to multiple channels (as in, sound coming from multiple locations)? Why would that pertain to the sample-rate (192kHz)?