On Thu 25 Mar 2021 at 12:20:56 (+0000), Long Wind wrote:
> now i modify my requirement to how to use arecord to record sound being
> played to wav file
That makes it easier as there's less work for the CPU to do.
> i use buster, how to set default sound recording source?
One way is to run alsamixer in an xterm.
Help is in the top-right corner.
$ arecord -l will give you a list of capture devices.
To record, you could type, for example, in another xterm:
$ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav
where 10 gives you ten seconds; 0 gives you infinite (^C to stop),
cd gives higher quality (44100) than the default,
dat would give you the more modern 48000,
-v … gives a crude VU meter,
0,0 is the bit you have to determine from arecord -l
⮤ device
⮤ card (usually 0, but matters if you have, say, PCH and HDMI).
While arecord is running, you can play with the sliders for levels,
including monitoring with speakers/headphones, and changing the
capture device with <SPACE BAR>.
> in early debian distro (stretch?) sound mixer can be used to set recording
> source
Yes, I used to use aumix, but that's OSS (passé), not ALSA.
> PS: i use twm, i'm afraid that gnome recorder isn't good choice for me
If you can't get ALSA to work, you might have to use pulseaudio instead.
I believe that can overcome a card's limitations through software.
Cheers,
David.
