diff --git a/modules/environments/immich/default.nix b/modules/environments/immich/default.nix
index f1b50f2..46c6a51 100644
--- a/modules/environments/immich/default.nix
+++ b/modules/environments/immich/default.nix
@@ -24,7 +24,13 @@ in
       mediaLocation = "/var/lib/immich";
       machine-learning.enable = true;
       accelerationDevices = [ "/dev/dri/renderD128" ];
-      settings.server.externalDomain = "http://${hostName}:${toString port}";
+      # Setting `settings` puts Immich in config-file mode: the admin settings
+      # UI becomes read-only and system config is managed declaratively here.
+      settings = {
+        server.externalDomain = "http://${hostName}:${toString port}";
+        # Intel Quick Sync hardware transcoding (jupiter's iGPU).
+        ffmpeg.accel = "qsv";
+      };
     };
 
     # The native module does not add GPU groups; required for VAAPI/QSV transcoding.