I was having the same problem with the scraper hanging for over 20 minutes on *.iso files. Unchecking the media tags option did correct this.
Possibly there needs to be a conditional where it doesn't create media tags for 'image' formats (.iso, .img, .mds, etc) or a time out value where it will move on to the next file if it can't make sense of the video format in a reasonable amount of time, say 60 seconds.