On Sun, Apr 12, 2009 at 6:46 PM, hce <webmail.hce at gmail.com> wrote: > I am running CentOS 5.2. I tried to burn rmvb video files to DVD+R > disk using Nautilus 2.16.2, the files were burned to the disk, but > could not play it back with errors "Unkown file format". It was no > problem to play the same file located on the disk. Any advice please? I use K3b and I always specify that a verification be done. If you can play the same file on your hard drive, but not one you copied from there and burned to a DVD, I suspect the burn is bad. OT: You should upgrade to CentOS 5.3 so you will have the latest packages for security and stability.