Program to equalize video volumes

Ok, I have a lot of video files (most are mpegs, but there are a few oddballs). I don't mind converting the odd ones if the software will only work with mpegs. Anyway, the volume on a lot of them is either substantially higher or lower than the rest. Does anyone know of any kind of software that will re-encode (preferably as a batch since there's over a 100 of them) them with the same reference volume. That way I'm not constantly having to adjust the volume every time a different one starts playing.

Anyone have any idea? Or at least something that will let me set a reference volume file by file?

yeah i completely agree with you, sometimes they are REALLY loud and sometimes they are really soft, even in some moves there parts u can just about here but then then theme music is REDICULOUSLY loud! i hope someone knows sometign!