how to install real player and vlc player offline

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http://forums.fedoraforum.org – hi friends, i am using fedora 12. How can i install vlc player and real player in offline? And one more is , in fedora we have the default players Rythmbox and movieplayers. If i tried to play songs or movie it showed an error saying "need codecs"? How can i resolve these problems? please give an urgent reply to my questions as soon as possible. (HowTos)