Matrix (Xvid Presets?)

[Blizzardstar]

Hello, I've been reading a few topics related to this but I've been having a lot of trouble understanding how to use it. Could anyone give me some useful threads about this or write (in a intended for newbs way) guide in here. Please.
I don't even know what/where is the Enc tool.
I must learn to crawl before I learn to walk. :confused: