Original commit message from CVS:
2006-02-10  Andy Wingo  <wingo@pobox.com>

* examples/play.py (GstPlayer.query_position)
(PlayerWindow.update_scale_cb): Only return position, duration
from query_position -- fixes a bugaboo.
(main): Add some input validation.

* examples/pipeline-tester (data): Add a pipeline to test software
scaling.