libs/gst/base/gstcollectpads.c (gst_collect_pads_chain): Only update last_stop if...

libs/gst/base/gstcollectpads.c (gst_collect_pads_chain): Only update last_stop if we're in TIME format and the timest...

Original commit message from CVS:
2006-02-07  Andy Wingo  <wingo@pobox.com>

* libs/gst/base/gstcollectpads.c (gst_collect_pads_chain): Only
update last_stop if we're in TIME format and the timestamp is
valid.

* libs/gst/base/gstcollectpads.c (gst_collect_pads_event)
* libs/gst/base/gstbasetransform.c (gst_base_transform_eventfunc):
* libs/gst/base/gstbasesink.c (gst_base_sink_configure_segment):
If we get a new newsegment with a different format, adapt
accordingly.

* gst/gstclock.c (gst_clock_set_calibration): Accept a numerator
of 0. Not a problem, really.