Index: libhb/dvd.c
===================================================================
--- libhb/dvd.c	(revision 69)
+++ libhb/dvd.c	(working copy)
@@ -607,7 +607,19 @@
     return 1;
 }
 
+
 /***********************************************************************
+ * is_nav_pack
+ ***********************************************************************
+ * Pretty much directly lifted from libdvdread's play_title function.
+ **********************************************************************/
+int is_nav_pack( unsigned char *buf )
+{
+    return ( buf[41] == 0xbf && buf[1027] == 0xbf );
+}
+
+
+/***********************************************************************
  * hb_dvd_read
  ***********************************************************************
  *
@@ -632,6 +644,11 @@
                 return 0;
             }
 
+            if ( !is_nav_pack( b->data ) ) { 
+                (d->next_vobu)++;
+                continue;
+            }
+
             navRead_DSI( &dsi_pack, &b->data[DSI_START_BYTE] );
             
             block     = dsi_pack.dsi_gi.nv_pck_lbn;