Index: demux_nsv.c
===================================================================
--- demux_nsv.c (revision 20480)
+++ demux_nsv.c (working copy)
@@ -170,6 +170,8 @@
                 
             // NSVs
             stream_read(demuxer->stream,hdr,17);        
+            if (stream_eof(demuxer->stream) || strncmp(hdr, "NSVs", 4))
+                return 0;
         }
 
         // dummy debug message