diff --git a/home/.config/mpv/input.conf b/home/.config/mpv/input.conf
index 7dcbd6d..c97d02a 100644
--- a/home/.config/mpv/input.conf
+++ b/home/.config/mpv/input.conf
@@ -22,3 +22,7 @@ Alt+left  add video-pan-x  0.05
 Alt+right add video-pan-x -0.05
 Alt+up    add video-pan-y  0.05
 Alt+down  add video-pan-y -0.05
+
+# sub-delay for fixing 24 empty frames on blu-ray
+Alt+z add sub-delay -1
+Alt+Z add sub-delay +1