When I do arecord -f S16_LE --channels=2 --device="hw:2,0" --rate=44100 junk.wav It doesn't complain but the recording is silence. Something may be turned down or off in the mixer. Or I'm recording the wrong subdevice. hw:2,1 and hw:2,2 don't seem to be found. If I amplify (40 db) in Audacity there's not really anything there. I'm using a bare electret cartridge with a 3.9 k resistor from 4.2 volts in from a lithium cell, and a 1 MFD coupling cap. I'd expect to see something when I tap on it, but nothing. On 7/20/20, Alan Corey <alan01346@xxxxxxxxx> wrote: > Hmm, none of these are 1 channel. I do want 2 channels but so far > I've got 1 electret cartridge on prototype board trying to figure out > how much amplification I need. > > USB Sound Device at usb-3f980000.usb-1.5, full speed : USB Audio > > Playback: > Status: Stop > Interface 1 > Altset 1 > Format: S16_LE > Channels: 8 > Endpoint: 6 OUT (ADAPTIVE) > Rates: 44100, 48000 > Interface 1 > Altset 2 > Format: S16_LE > Channels: 2 > Endpoint: 6 OUT (ADAPTIVE) > Rates: 44100, 48000 > Interface 1 > Altset 3 > Format: S16_LE > Channels: 4 > Endpoint: 6 OUT (ADAPTIVE) > Rates: 44100, 48000 > Interface 1 > Altset 4 > Format: S16_LE > Channels: 6 > Endpoint: 6 OUT (ADAPTIVE) > Rates: 44100, 48000 > Interface 1 > Altset 5 > Format: S16_LE > Channels: 2 > Endpoint: 6 OUT (ADAPTIVE) > Rates: 96000 > > Capture: > Status: Stop > Interface 2 > Altset 1 > Format: S16_LE > Channels: 2 > Endpoint: 5 IN (ASYNC) > Rates: 44100, 48000 > > > > On 7/20/20, Clemens Ladisch via Alsa-user > <alsa-user@xxxxxxxxxxxxxxxxxxxxx> wrote: >> Alan Corey wrote: >>> arecord -f S16_LE -d 10 -r 16000 --channels=1 --device="hw:2,0" >>> /tmp/test-mic.wav >>> Recording WAVE '/tmp/test-mic.wav' : Signed 16 bit Little Endian, Rate >>> 16000 Hz, Mono >>> arecord: set_params:1345: Channels count non available >> >> I suspect recording always uses channels. >> Please show the contents of /proc/asound/card2/stream0. >> >> >> Regards, >> Clemens >> >> >> _______________________________________________ >> Alsa-user mailing list >> Alsa-user@xxxxxxxxxxxxxxxxxxxxx >> https://lists.sourceforge.net/lists/listinfo/alsa-user >> > > > -- > ------------- > No, I won't call it "climate change", do you have a "reality problem"? - > AB1JX > Cities are cages built to contain excess people and keep them from > cluttering up nature. > Impeach Impeach Impeach Impeach Impeach Impeach Impeach Impeach > -- ------------- No, I won't call it "climate change", do you have a "reality problem"? - AB1JX Cities are cages built to contain excess people and keep them from cluttering up nature. Impeach Impeach Impeach Impeach Impeach Impeach Impeach Impeach _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
