Manjaro i3 OBS System Audio Capture Help

 OS: Manjaro 18.0.4 Illyria
 Kernel: x86_64 Linux 4.19.62-1-MANJARO
 Uptime: 2h 22m
 Packages: 1248
 Shell: zsh 5.7.1
 Resolution: 3840x1080
 WM: i3
 GTK Theme: Adapta-Nokto-Eta-Maia [GTK2/3]
 Icon Theme: Papirus-Adapta-Nokto-Maia
 Font: Noto Sans 11
 CPU: Intel Core i7-8550U @ 8x 4GHz [72.0°C]
 GPU: Unknown
 RAM: 2802MiB / 7885Mi

After I installed OBS, I found that it could not capture system audio.
That is, there is no oscillation in Mixer while my music player is working well.

What I have tried:

  • In Sources, choose Audio Capture Device (ALSA). Not working, it actually captures sound from my earphone.
  • In Sources, choose Audio Output Capture (PulseAudio). Not working. There is no device available.
  • In Settings/Audio/Devices, the list of Desktop Audio is empty and so it's set to Disabled by default.

I guess this problem is caused by system audio applications.
Could you give me some hints about what applications I need to install and how to configure the audio system?

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