This is my first post here on the CentOS forums.  I've been running Fedora since FC4, and have been working with RHEL 4 at work.  But this is my first foray into CentOS.

I followed the multimedia guidance on the wiki, and now have the ability to view a lot of different video clips on the Internet, and have the ability to listen to a variety of music files.  However, watching a DVD movie still escapes me. I followed all the steps on the page in the wiki, and had no errors in the output.

When I put the DVD (Master and Commander in this case), into the drive, totem automatically comes up and I get a warning that I don't have the correct codec to play it.

I killed totem and manually tried to start the DVD with mplayer. mplayer sat there...not recognizing that there was a DVD in the drive.

So...what final steps do I need to complete to get a commercial DVD movie to play?

machine is a Dell Latitude D830 with 2GB of ram and an Intel Core 2 Duo.