Comment # 13 on bug 1074273 from Wolfgang Bauer

As I somehow suspected, you have a wild mixture of 1.12.3 and 1.8.3 packages:
(In reply to Patrick Finie from comment #12)
> libgstreamer-1_0-0-1.12.3-95.7.x86_64
> gstreamer-plugins-bad-1.8.3-8.7.x86_64
> gstreamer-plugins-base-1.12.3-91.16.x86_64
> libgstreamer-1_0-0-32bit-1.12.3-95.7.x86_64
> gstreamer-plugins-good-lang-1.12.3-103.4.noarch
> gstreamer-plugins-ugly-1.8.3-10.2.x86_64
> gstreamer-plugins-base-lang-1.12.3-91.16.noarch
> gstreamer-plugins-good-1.12.3-103.4.x86_64
> gstreamer-lang-1.12.3-95.7.noarch
> gstreamer-plugins-bad-lang-1.8.3-8.7.noarch
> gstreamer-1.12.3-95.7.x86_64

Make sure all of those are either 1.12.3 or (preferably) 1.8.3 from the
standard 42.3 repo and/or Packman, and it should work. (click on "Versions" in
YaST e.g. to choose the version)

I'm not sure about those, but it's best to have all of them from the same repo:
gstreamer-plugins-farstream-0.2.8-3.4.x86_64
gstreamer-plugins-cogl-1.22.2-3.17.x86_64
gstreamer-plugin-gstclutter-3_0-3.0.18-3.3.x86_64

Not a bug though, such a mixture is unsupported.

> Also you have to go into the KDE settings and change the phonon preference
> or it will continue to default to the non VLC one.

Sure, you can explicitly set one or the other, and that setting will be
remembered.
On a fresh user account, the VLC backend should be preferred though if it is
installed.