vlc codecs problem

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http://www.linuxquestions.org – i followed this site http://vcn.bc.ca/~dugan/setting-up-slackware.html to install the codecs. i downloaded the codecs from this site http://www.mplayerhq.hu/design7/dload.html but when i use vlc to run a video of format(mpg, mpeg) Code: No suitable decoder module: VLC does not support the audio or video format (HowTos)