Yep I finally came around knowing what I was doing wrong. I simply forgot to put a sample bitrate! See, thing is, although I could use a frontend GUI (sort of a window to make it look like a software) and make it an easy drag and drop thing, I wanted to do it myself with a command line. So yep, I simply forgot to put the sample bitrate. So the command line looked as simple as this;

mencoder 00001.avi -o 00002.avi -ovc lavc -oac mp3lame -srate 16000

That simple. Yep. So it was me to blame ;D

Anyway now I've uploaded the video which is me playing the song Stellar by Incubus at Guitar Hero on the Expert difficulty. Quite an easy song I must admit, but it remains one of my favorites to play in the game. I did a little mistake, where I accidentaly pushed the higher fret when holding down a long note which simply cuts the sound short, but doesn't mess up my combo or anything. Enjoy!

By the way, the weird dark, thick line passing through is cause from my cam filming the TV, don't worry,my TV doesn't do that lol.

[video=KidikTT75b0MvD_d]