"Other" category filling the storage bar

Over the past month or so, I've been recording a lot of videos for a Let's Play channel. I've noticed that as the amount of space taken up by the "Movies" category increased, the space taken up by the "Other" category has increased drastically. Currently, the "Other" category is taking up a ludicrous 103.04 GB and I see no possible reason why that is.

I've tried all the suggestions on a frequently suggested website (http://pondini.org/OSX/DiskSpace.html) that I thought might apply to me but nothing worked. Does anyone have any suggestions on how I might be able to find all the files that are taking up so much space?