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Download Handbrake. It's free.

You can also use MPEG Streamclip, also free.

Quicktime Pro works too, but will cost you $20.
 
ffmpegx is good, but it can be tricky to install for non-savvy users and is not user friendly.

Are you referring to ffmpeg or ffmpegX?
ffmpegX is fairly straightforward, just follow the instructions.
ffmpeg is a far too difficult for the "non-savvy" user.
 
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