Totem codecs and complements

"A.MUÑUMER" <[email protected]>
Newsgroups gmane.linux.redhat.rhn.user
Message-ID <[email protected]>
  I am working RedHat Enterprise Linux 5 and when starting Totem to 
watch films on dvd I receive a error message " You need codecs .........."
Could anybody tell me where to get the necesary codecs and rest of 
complements to run Totem ?
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