Not only does it tell you what codecs the video uses, it tells you if you have them installed. Also in the mix is a bunch of useful/useless video statistic information. Every video application from Quicktime, Windows media Player all the way to Premiere, Avid and Final Cut should make this info available from a simple right click <properties>. But it's not that easy until G Spot.
It also has a cool visual GOP feature that gets into the nitty gritty of Base Key, Layout Width, Frame Order, Frame Number Overlay, B-Frame Dependencies, and Interlace / Pulldown for those of you that are into the building blocks of a video file. Show your support to the developer and donate if you can or at least look at the ads to see if there is something you can use ;-). I'm a firm supporter of freeware that doesn't take over a computer. Have a good night.