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I just finished my first Adobe Air Application. It is a simple bitrate calculator. It can be downloaded and installed and will allow you to compute the size of a video file given a specific bitrate and duration (minutes, seconds, hours). You can download a copy of my Bitrate Calculator here:
Download CK's Bitrate Calculator
You will also need the Adobe Air Runtime for this to run.
Since I haven' t been able to buy a Digital Signing Certificate yet, this application will come up with a bunch of "issues", but it is a valid working program.