Video Converters for mac ***NOT PC***

Hey guys, just wondering if there are any video codecs out there that work for macs, i've tried all of the suggested programs with all of the set parameters and nothing works, simply nothing. Now, I KNOW some of you keep posting all of these quick and easy ways of converting videos, but, as it turns out, they are always programs for the PC which is getting thoroughly frustrating. Can anybody help? I've tried everything so far, and when I say everything, I MEAN everything. I'm sure I would get the full experience if I had a PC, but, seriously, this is insane if it has to be THIS inconvenient because I have a mac.

did you try ffmpegx? http://homepage.mac.com/major4/

i have that same problem

and ffmpegx doesnt work either

I mean, I have tried ffmpegx and it doesn't work. I am playing around with Mencoder these days and it SEEMS promising, but who knows.... I just have to get the right parameters.