Please verify you have installed gstreamer0.10-gnonlin

gir1.2-gstreamer-0.10		Description: GObject introspection data for the GStreamer library
gstreamer0.10-alsa		GStreamer plugin for ALSA
gstreamer0.10-ffmpeg		FFmpeg plugin for GStreamer
gstreamer0.10-fluendo-mp3	Fluendo mp3 decoder GStreamer plugin
gstreamer0.10-gnomevfs		GStreamer plugin for GnomeVFS
gstreamer0.10-gnonlin		non-linear editing module for GStreamer
gstreamer0.10-nice		ICE library (GStreamer plugin)
gstreamer0.10-plugins-bad	GStreamer plugins from the "bad" set
gstreamer0.10-plugins-bad-multiverse	GStreamer plugins from the "bad" set (Multiverse Variant)
gstreamer0.10-plugins-base	GStreamer plugins from the "base" set
gstreamer0.10-plugins-base-apps	GStreamer helper programs from the "base" set
gstreamer0.10-plugins-good	GStreamer plugins from the "good" set
gstreamer0.10-plugins-ugly	GStreamer plugins from the "ugly" set
gstreamer0.10-pulseaudio	GStreamer plugin for PulseAudio
gstreamer0.10-tools		Tools for use with GStreamer
gstreamer0.10-x			GStreamer plugins for X11 and Pango
libgstreamer-perl		Perl interface to the GStreamer media processing framework
libgstreamer-plugins-bad0.10-0	GStreamer shared libraries from the "bad" set
libgstreamer-plugins-base0.10-0	GStreamer libraries from the "base" set
libgstreamer0.10-0		Core GStreamer libraries and elements
libgstreamer0.10-dev		GStreamer core development files