Original commit message from CVS:
* ext/mad/gstmad.c: (gst_mad_src_query), (gst_mad_sink_event),
(gst_mad_chain):
Add convert function for proper timestamp calculations.

* gst/avi/gstavidemux.c: (gst_avi_demux_send_event),
(gst_avi_demux_stream_header), (gst_avi_demux_handle_seek),
(gst_avi_demux_process_next_entry), (gst_avi_demux_loop):
Send out initial discont.