handler can be NULL if we did not support this dynamic format (codec).

Fixes issue 1658 (the crasher), although the format itself is obviously
still unsupported.

Originally committed as revision 21078 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rdt.c

@@ -67,7 +67,7 @@ ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
     s->prev_set_id    = -1;
     s->prev_stream_id = -1;
     s->prev_timestamp = -1;
-    s->parse_packet = handler->parse_packet;
+    s->parse_packet = handler ? handler->parse_packet : NULL;
     s->dynamic_protocol_context = priv_data;
 
     return s;