Back on 2 Feb, hand of fate suggested looking at VLC. Their web site,
www.videolan.org, looked impressive! I installed VLC as follows:
1. On the download page, I followed the instructions for Fedora Core 4 to get and install the installation public key.
2. Files vlc.repo and vlc-contrib.repo were created in /etc/yum.repos.d, as per supplied text. I substituted "4" for "$releasever", and "i386" for "$basearch".
3. "yum update" then ran.
4. The VideoLAN forums has a thread "Fedora 6 Trouble - Missing Dependency" which indicates there are problems with the next step - "yum install vlc". I did not do the stuff shown in [Part 1] of that thread, I simply went to [Part 2] and "yum instll videolan-client". A lot of dependencies were installed.
5. Applications -> Sound & Video" now lists "VLC media player", and it runs! I can play DVD's, and they look good!
Problem fixed. My thanks to Ben and Hand for their advice and assistance in this matter - well done!. LinuxQuestions forums work...
Regards,
Jon