I've been spending hours trying to find out the best way to get a FCX project exported to MPEG-2, and there doesn't appear to be any way to do it directly (without getting FCP). I have ffmpegX, and I could get other MPEG-2 encoding apps, but having to export from FCX first, what would be the best option to choose to not loose to much video/audio quality (NO compression would result in a file a bit larger than I care to handle)?