OBS Studio (Flatpak version) can't record audio

Help
1

Hello anyone.
I have problem from OBS Studio installation from Flatpak. It can’t record audio input. I haven’t idea how to fix it because in Flatseal microphone slider in Flatseal is disabled. Please help me to solve this problem. I attach any relevant information about this problem.

This is my OBS Studio configuration (get focused to “Source” section)

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It disabled on Flatseal and it can’t change to enable it

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This is my audio configs

   # Enable sound with pipewire.
   sound.enable = true;
   hardware.pulseaudio.enable = false;
   security.rtkit.enable = true;
   services.pipewire = {
     enable = true;
     alsa.enable = true;
     alsa.support32Bit = true;
     pulse.enable = true;
    # If you want to use JACK applications, uncomment this
    #jack.enable = true;
  };

My Nix info

anifyuli@ThinkPad-X280:~  
$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.1.90, NixOS, 23.11 (Tapir), 23.11.6827.383ffe076d9b`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - channels(root): `"android-nixpkgs, home-manager-23.11.tar.gz, nixos-23.11, nixos-hardware, nixos-unstable"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

I install NixOS on ThinkPad X280

2

You’re using Pipewire, which could be breaking things (I know it breaks Musescore at least), try Pulseaudio – replace your sound section with this (and change things if needed):

  sound.enable = true;
  hardware.pulseaudio = {
    enable = true;
    support32Bit = true;
    extraConfig = "load-module module-combine-sink";
  };
  security.rtkit.enable = true;

Also don’t forget to add “audio” to your extraGroups in your user section. Here’s some more explanations on this code: PulseAudio - NixOS Wiki

3

This problem solved with change to unstable channel for core system and using OBS Studio from Nixpkgs