I was experimenting witht trick modes using the tutorial at http://docs.gstreamer.com/display/GstSDK/Basic+tutorial+13%3A+Playback+speed It seems that after changing the seek direction twice, playback stops (and cannot not be resumed with the keyboard controls provided in the example). For example, inverting the seek direction at t=5 played the movie backwards (OK) then inverting again at t=2 played the movie forwards (OK) but then playback stops at t=5. Changing "GST_SEEK_TYPE_NONE, 0" to "GST_SEEK_TYPE_SET, -1" on line 29 fixed the problem.
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