Amarok not playing m4a

[andrea]

I cant play m4a files with amarok.
They do not even appear in the list of files when browsing.

It is configured to use gstreamer and I have the following plugins installed

PackageKit-gstreamer-plugin-0.7.5-1.fc17.i686
gstreamer-plugins-bad-free-extras-0.10.23-7.fc17.i686
phonon-backend-gstreamer-4.6.0-1.fc17.i686
gstreamer-plugins-ugly-0.10.19-1.fc17.i686
gstreamer-plugins-good-0.10.31-4.fc17.i686
qt-gstreamer-0.10.2-1.fc17.i686
gstreamer-plugins-bad-0.10.22-4.fc17.i686
gstreamer-plugins-bad-free-0.10.23-7.fc17.i686
gstreamer-tools-0.10.36-1.fc17.i686
gstreamer-ffmpeg-0.10.13-2.fc17.i686
gstreamer-0.10.36-1.fc17.i686
gstreamer-plugins-base-0.10.36-1.fc17.i686


mplayer of course plays it with no problems.

Any idea what I might be missing?