Comment 18 for bug 981224

David asked my IRC personification named Onkeltem to post more info about my system.

Well, it's Ubuntu 11.10, x86_64, with medibuntu repo, gnome 3 (gtk 3.2).
As far as I know, I have no custom libraries or codecs installed.

fantomas@alpha:~$ COLUMNS=200 dpkg -l '*gstreamer*' | grep ii
ii gir1.2-gstreamer-0.10 0.10.35-1 Description: GObject introspection data for the GStreamer library
ii gstreamer0.10-ffmpeg 0.10.12-1ubuntu1 FFmpeg plugin for GStreamer
ii gstreamer0.10-fluendo-mp3 0.10.15.debian-1 Fluendo mp3 decoder GStreamer plugin
ii gstreamer0.10-gconf 0.10.30-1ubuntu7.1 GStreamer plugin for getting the sink/source information from GConf
ii gstreamer0.10-gnomevfs 0.10.35-1 GStreamer plugin for GnomeVFS
ii gstreamer0.10-nice 0.1.0-2ubuntu1 ICE library (GStreamer plugin)
ii gstreamer0.10-plugins-bad 0.10.22-2ubuntu4 GStreamer plugins from the "bad" set
ii gstreamer0.10-plugins-base 0.10.35-1 GStreamer plugins from the "base" set
ii gstreamer0.10-plugins-good 0.10.30-1ubuntu7.1 GStreamer plugins from the "good" set
ii gstreamer0.10-plugins-ugly 0.10.18-3ubuntu1 GStreamer plugins from the "ugly" set
ii gstreamer0.10-pulseaudio 0.10.30-1ubuntu7.1 GStreamer plugin for PulseAudio
ii gstreamer0.10-x 0.10.35-1 GStreamer plugins for X11 and Pango
ii libgstreamer-plugins-base0.10-0 0.10.35-1 GStreamer libraries from the "base" set
ii libgstreamer0.10-0 0.10.35-1 Core GStreamer libraries and elements

fantomas@alpha:~$ COLUMNS=200 dpkg -l '*264*' | grep ii
ii libx264-116 2:0.116.2042+git178455c-1ubuntu1 x264 video coding library