How do I Installing a codec for Real Player

Hi there,
I am pretty sure that some of you has counter this problem before this,
I just finished installed RealPlayer11Gold. But the problem arrive when I was about to play .avi file extensions.

I know that everyone in the forum that I search in Google has suggest the other to used other than real player such as mplayer or vlc, but I just want to know that is it possible to install the codec and how?

I don't have any problem with the other player, but the problem for me is especially at the seekbar. Sometimes when I want to go back by click, it drag to early, when I want to go forward, it go to fast. I have installed mplayer classic, but it is useless, cannot be used under wine or crossover..

Thank You.

you could try installing the gstreamer plugins. that was suggested on another forum but the OP that this solution was suggested to said that didn't work for them.

which distro are you running?

oh, i try search that first, I am using Ubuntu right now.