--- branches/dev-api-4/xvidcore/vfw/src/codec.c	2003/12/05 14:44:35	1242
+++ branches/dev-api-4/xvidcore/vfw/src/codec.c	2003/12/06 14:54:00	1245
@@ -489,9 +489,11 @@
     int i;
 
     for (i=0; i<config->num_zones && config->zones[i].frame <= framenum; i++) ;
-    i--;
 
-    frame->type = config->zones[i].type;
+    if (--i < 0) return; /* there are no zones, or we're before the first zone */
+
+    if (framenum == config->zones[i].frame)
+		frame->type = config->zones[i].type;
 
     if (config->zones[i].greyscale) {
         frame->vop_flags |= XVID_VOP_GREYSCALE;