open gspot, drag and drop the file that you want information on into gspot's window
press ctrl+prt scrn to take a screenshot of just the gspot window.(might have to press ctrl + fn + prnt scrn if you're using a laptop)
paste the screenshot into paint, save, imageshack it and then post the screenshot here.
Alternatively, you could read the gspot guide
and tell us which codec it says the file uses (Codec Name is what we're looking for)