graphical/mpv: add useFullFFmpeg option

graphical/mpv.nix

@@ -15,6 +15,17 @@ in
 
     package = lib.mkPackageOption pkgs name { };
 
+    useFullFFmpeg = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        Use pkgs.ffmpeg-full within mpv, for more media support.
+        For instance, this makes jxl viewing and screenshots possible.
+
+        However, this will (almost certainly) require a local compilation of mpv
+      '';
+    };
+
     extraConfig = lib.mkOption {
       type = lib.types.lines;
       default = ''
@@ -44,7 +55,8 @@ in
 
   config = lib.mkIf cfg.enable {
     environment.systemPackages = [
-      (cfg.package.override {
+      (
+        cfg.package.override {
           extraMakeWrapperArgs = [
             "--add-flags"
             "--config-dir=${
@@ -57,7 +69,13 @@ in
               }
             }"
           ];
-      })
+        }
+        // lib.optionalAttrs cfg.useFullFFmpeg {
+          mpv-unwrapped = pkgs.mpv-unwrapped.override {
+            ffmpeg = pkgs.ffmpeg-full;
+          };
+        }
+      )
     ];
   };
 }