Playing m4a files in banshee

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http://forums.opensuse.org – How come I am able to play m4a music files in : - Amarok - VLC Media Player - MPlayer (with some flashing error messages though) and not in : - Banshee (asks to search for a suitable codec, but that leads me nowhere) - Rhythmbox (same as Banshee) - Totem (error message : GStreamer encountered a general stream error) Shall I check the gstreamer libs that i have installed? How do I do that? Or shall I check something else? I would really like to make it work in banshee because it's the only music player that supports audio CDs correctly without crashing... Thanks, A total newbie :). (Distributions)