Okay! So this is a proof-of-concept video scrobbler. It works with QuickTime and (currently) only mov/mp4/m4v files with metadata. Here's a video of how it works.
It works with my VideoScrobbler website to keep track of what you're watching and when. Even that website is proof-of-concept, please don't expect it to be fit for use, but please do contribute if you're keen!