(feat): jellyfin transcoding support

features/server/multimedia/jellyfin.nix

@@ -1,5 +1,22 @@
-{ config, ... }:
+{ pkgs, config, ... }:
 {
+  # 1. enable vaapi on OS-level
+  nixpkgs.config.packageOverrides = pkgs: {
+    vaapiIntel = pkgs.vaapiIntel.override { enableHybridCodec = true; };
+  };
+
+  hardware.opengl = {
+    # hardware.opengl in 24.05
+    enable = true;
+    extraPackages = with pkgs; [
+      intel-media-driver
+      intel-vaapi-driver # previously vaapiIntel
+      vaapiVdpau
+      intel-compute-runtime # OpenCL filter support (hardware tonemapping and subtitle burn-in)
+      vpl-gpu-rt # QSV on 11th gen or newer
+      intel-media-sdk # QSV up to 11th gen
+    ];
+  };
   services.jellyfin = {
     enable = true;
     openFirewall = true;