jittery video playback ?

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http://forums.opensuse.org – Hi I just finished trying to install the codecs for various audio/video playback (Restricted Formats/11.2 - openSUSE-Community) and now i can play flash, mp3s and such but most of the video playback is very jittery and is not watchable. I have now tried it with mplayer and kaffine but still the same. I had this problem before as well and even tried VLC but no luck. I had thought i could just add the Nvidia repository and type in my graphics card, install and be done with it but no such luck (nothing even comes up when i type geforce). Has anyone else had this problem? any ideas on how to resolve it would really be appreciated! Cheers -Gaiko (Distributions)