FZ1

Another solution may be to scan the video with TV commercial detection software used on home TV DVR's. These devs have worked for years on the logic, one method they use is to detect changes in black level (like those between many TV show segments and their commercials). Can't hurt to run them and see what comes out, both offer free versions. Comskip http://www.kaashoek.com/comskip/ Show Analyzer http://www.dragonglobal.biz/showanalyzer.html