{ config, pkgs, lib, ... }:
{
  # enable opengl (headless)

  # https://github.com/NixOS/nixpkgs/blob/nixos-22.11/pkgs/development/libraries/ffmpeg/generic.nix
  # https://github.com/NixOS/nixpkgs/blob/nixos-22.11/pkgs/development/libraries/jellyfin-ffmpeg/default.nix

  nixpkgs.config.openglSupport = true; # why is this not set by hardware.opengl.enable ?
  nixpkgs.config.vaapiSupport = true;
  nixpkgs.config.libmfxSupport = true; # intel
  nixpkgs.config.libaomSupport = true;
  nixpkgs.config.vdpauSupport = true; # intel

  hardware.opengl.enable = true;
  #hardware.opengl.extraPackages = [ pkgs.mesa.drivers ];
  hardware.opengl.extraPackages = with pkgs; [ mesa.drivers vaapiIntel libvdpau-va-gl vaapiVdpau intel-ocl ];
}