Because I cannot find where to report this, I will smply post this information here. MPlayer seems to have some trouble with Nvidia cards and the VIDIX driver. They are also not sure how it works under SiS cards. I have played around with a few distros and my cards to see how it works out.

Fedora Core 2 and Nvidia:
Failed to find VIDIX driver even with Nvidia drivers installed.

Ubuntu and Nvidia:
Failed to find VIDIX driver even with Nvidia drivers installed.

Knoppix v3.8.1 and Nvidia:
Successful install without Nvidia drivers.

Fedora Core 3 and Nvidia:
Successful install even without Nvidia drivers.

Fedora Core 3 and SiS 650:
Successful install.