I have the same problem too in Wheezy (Debian 7). It is ok when run "gstreamer-properties" at first time and I got this error after second time.
$ gstreamer-properties (gstreamer-properties:4804): Gtk-WARNING **: Unknown property: GtkDialog .has-separator (gstreamer-properties:4804): Gtk-WARNING **: Unknown property: GtkDialog.has-separator gstreamer-properties-Message: Skipping unavailable plugin 'alsasink' gstreamer-properties-Message: Skipping unavailable plugin 'artsdsink' gstreamer-properties-Message: Skipping unavailable plugin 'esdsink' gstreamer-properties-Message: Skipping unavailable plugin 'sunaudiosink' gstreamer-properties-Message: Skipping unavailable plugin 'glimagesink' gstreamer-properties-Message: Skipping unavailable plugin 'sdlvideosink' gstreamer-properties-Message: Skipping unavailable plugin 'v4lmjpegsrc' gstreamer-properties-Message: Skipping unavailable plugin 'qcamsrc' gstreamer-properties-Message: Skipping unavailable plugin 'v4lsrc' gstreamer-properties-Message: Skipping unavailable plugin 'alsasrc' gstreamer-properties-Message: Skipping unavailable plugin 'esdmon' gstreamer-properties-Message: Skipping unavailable plugin 'sunaudiosrc' 程式記憶體區段錯誤 Sorry, the last line "程式記憶體區段錯誤" is traditional Chinese. It's means "program memory segment error" in English. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1017840 Title: Unknown property: GtkDialog.has-separator To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-media/+bug/1017840/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs