It's depending on the format of your VIDEO.
If your video is in a VCD, Use Clipper: *www.simtel.net/vcliper.zip*www.softlookup.com/display.asp?id=10416
If your file is MPEG, Use Splitter: *www.boilsoft.com/videosplitter/
If your Video is in DVD, Use Cinimatize: *www.miraizon.com/support/downloads.html