When using the mediainfo CLI for mac OSX 10.7.3 I encountered a bug where mediainfo will not be able to parse a variable. For example, I declare a variable FOO as "~/desktop/song.mp3" and then use a basic mediainfo command of `mediainfo "$FOO"`. However, this returns a blank line. Doing the same exact command, but with the variable replaced with its value does return a value though. So the command `mediainfo ~/desktop/song.mp3` will return the regular mediainfo information.