
I am looking for a free mkv file converter, or a cheap one

I was looking at river past video cleaner and it's demo seemed to work real well though it still compressed the video after it was converted. Also it's $30 which right not is a lot.
Is there a program that will allow me to convert mkv files to a files that premiere can read that isn't compressed? Since I don't want it compressed while being converted then being compressed again when I'm finished with the video.
also is VirtualDubMod a converting tool? i can't seem to figure out what it is.
I'm also interested in converting ogm files but that seems to be easier than mkv's.
Help appreciated.