Input record with GNU/Linux

Help/How To
1

Hello, I am working with shotcut on Debian 9.

I have problems with the input microphone. I follow this steps:

  1. File->Open Other->ALSA Audio->Select default PCM Device
  2. When white screen start to monitor input I start to hear a noise, If I stop the monitor, the noise stops, but I never can get my voice

This is my configuration for ALSA:
emonge@angello:~/Downloads/Shotcut/Shotcut.app$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC293 Analog [ALC293 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0

emonge@angello:~/Downloads/Shotcut/Shotcut.app$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC293 Analog [ALC293 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0

I need to know what is the name of my microphone, I tried use /dev/snd/blablabla but never works, I only receive the message: Failed to open.

I don’t have configured any /etc/asound.conf or $HOME/.asoundrc file.

2

If you stop the monitor, you also stop the audio capture. That is by design.
I cannot tell you exactly which ALSA PCM to use for your microphone input as it varies per audio device, but you need to use arecord -L (big L) to list ALSA PCMs, not the little L which lists devices. But usually “default” will work and is the default. Perhaps you need to use alsamixer to select your input source and level. Linux audio can be a real pain, but PulseAudio can make it easier.