That looks like a gstreamer bug, I've forwarded it upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=413801
** Changed in: gnome-media (Ubuntu)
Sourcepackagename: gnome-media => gstreamer0.10
Status: Needs Info => Confirmed
** Bug watch added: GNOME Bug Tracker #413801
http://bugzilla.gnome.org/show_bug.cgi?id=413801
** Also affects: gstreamer (upstream) via
http://bugzilla.gnome.org/show_bug.cgi?id=413801
Importance: Unknown
Status: Unknown
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[apport] gstreamer-properties crashed with SIGSEGV"
https://launchpad.net/bugs/89130
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