The ATI display drivers are unified for their Radeon and FireGL products -- meaning a single driver package is compatible with all of their products (except for some of their older hardware such as the R200 class). The ATI fglrx package is now also combined for x86 and x86_64.
What media player are you using? I imagine Totem? If so, install mplayer from FreshRPMS.net and then install the codecs.
You need to repeat the installation process everytime you update your kernel and everytime a new driver is released (if you want). The 8.29.6 driver requires my script but all future ATI drivers will have the script merged.
If you have any additional questions don't hesitate to post.