digiKam3: Export to Video Slideshow produces "missing element" errors


there was a recent thread at the german openSUSE mailinglist about using the new feature “Export to Video Slideshow” [1]. This export offers several formats: AVI, VCD, …, DVD, OGG. The only one that works is OGG. The others fail with error messages about missing gstreamer elements “xvidenc” or “mpeg2enc”. I’ve installed (almost) all gstreamer-plugins from the Packman repository, including “bad” and “ugly” - without success.
Also gst-inspect-0.10 does not show any signs of the missing elements. Does anyone know, how to make this work?


[1]: opensuse 12.3 und digikam 3.0 ff.