Video recorded with guvcview doesn't have audio of the microphone

system:

[chris@f34 Downloads]$ neofetch
          /:-------------:\          chris@f34.ec 
       :-------------------::        ------------ 
     :-----------/shhOHbmp---:\      OS: Fedora 34 (Workstation Edition) x86_64 
   /-----------omMMMNNNMMD  ---:     Kernel: 5.12.9-300.fc34.x86_64 
  :-----------sMMMMNMNMP.    ---:    Uptime: 14 hours, 55 mins 
 :-----------:MMMdP-------    ---\   Packages: 1956 (rpm), 5 (flatpak) 
,------------:MMMd--------    ---:   Shell: bash 5.1.0 
:------------:MMMd-------    .---:   Resolution: 1920x1080 
:----    oNMMMMMMMMMNho     .----:   DE: GNOME 40.2 
:--     .+shhhMMMmhhy++   .------/   WM: Mutter 
:-    -------:MMMd--------------:    WM Theme: Adwaita 
:-   --------/MMMd-------------;     Theme: Adwaita [GTK2/3] 
:-    ------/hMMMy------------:      Icons: Adwaita [GTK2/3] 
:-- :dMNdhhdNMMNo------------;       Terminal: gnome-terminal 
:---:sdNMMMMNds:------------:        CPU: Intel i5-4430 (4) @ 3.200GHz 
:------:://:-------------::          GPU: NVIDIA GeForce GT 610 
:---------------------://            Memory: 8216MiB / 15793MiB 

[chris@f34 Downloads]$ 

webcam : logitech c920 HD with microphone included.

Installed guvcview by:

sudo dnf install guvcview

audio controls, guvcview

I have tryed with some combinations without success.
In Cheese (webcam app) the recorded video has audio only the video isn’t sharp

Any advice is welcome, thanks.

You could ask the developer if he checked it already for Gnome 40.0

Here is the link:
guvcview / Git-Master / [fdc0d4]

Do you have the pipewire-pulsaudio library installed?
Here the link how to do it:
Changes/DefaultPipeWire - Fedora Project Wiki

I had more or less the same problem as you. I know it sounds strange but on Fedora Silverblue I found that for some reason, if I don’t turn the microphone volume on the webcam to the maximum, it doesn’t record anything. But it works fine!