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MP4Box
Because I'm snotty, and I hate typing commands in caps, I've got a symlink from MP4Box to mp4box on my box, hence the examples being lower case. MP4Box dumps output to stderr, so I get to be snotty in return. :D
Display information about a file:
mp4box -info media.mp4
Set language to English on (all) tracks:
mp4box -lang eng media.mp4
Set a title for the video (assuming it's the first track):
mp4box -name 1="beandog's awesome media playback history documentary of doomness" media.mp4