You can choose between several movie players shipped with your openSUSE. Kaffeine is the default KDE movie player and can be run with several back-ends, such as Xine and MPlayer.
The formats you can view with Kaffeine depends on the back-end (by default, Xine is used). Xine interprets many of the most common multimedia formats available. For more information, refer to http://xinehq.de/.
In case the format is not supported by the player's engine, openSUSE offers to search for a suitable codec which you can then install with YaST.
Kaffeine can also play multimedia streamed over the Internet and can be used as a plug-in for Konqueror. It provides the usual options for playing files in full screen mode, navigating through files, and more. You can also take a snapshot of the video and save it as an image.
Apart from Kaffeine, openSUSE also ships RealPlayer for Linux. RealPlayer supports RealAudio, RealVideo, Ogg Vorbis, Theora, and more.