diff -ru mpeg2dec.orig/libvo/video_out_dx.c mpeg2dec/libvo/video_out_dx.c
--- mpeg2dec.orig/libvo/video_out_dx.c	2008-07-09 11:28:24.000000000 -0700
+++ mpeg2dec/libvo/video_out_dx.c	2012-09-08 05:31:39.304849824 -0700
@@ -92,9 +92,9 @@
     switch (message) {
 
     case WM_WINDOWPOSCHANGED:
-	instance = (dx_instance_t *) GetWindowLong (hwnd, GWL_USERDATA);
+	/*instance = (dx_instance_t *) GetWindowLong (hwnd, GWL_USERDATA);
 
-	/* update the window position and size */
+	// update the window position and size
 	point_window.x = 0;
 	point_window.y = 0;
 	ClientToScreen (hwnd, &point_window);
@@ -104,9 +104,9 @@
 	instance->window_coords.right = rect_window.right + point_window.x;
 	instance->window_coords.bottom = rect_window.bottom + point_window.y;
 
-	/* update the overlay */
+	// update the overlay 
 	if (instance->overlay && instance->display)
-	    update_overlay (instance);
+	    update_overlay (instance);*/
 
 	return 0;
 
@@ -173,7 +173,10 @@
     /* store a directx_instance pointer into the window local storage
      * (for later use in event_handler).
      * We need to use SetWindowLongPtr when it is available in mingw */
-    SetWindowLong (instance->window, GWL_USERDATA, (LONG) instance);
+
+    // Current version of MINGW-W64 does not have this!
+    // Since we are not outputting to a display, this is not a problem.
+    //SetWindowLong (instance->window, GWL_USERDATA, (LONG) instance);
 
     ShowWindow (instance->window, SW_SHOW);