A free mpeg commercial detector
Comskip can read MPEG and h.264 video and MPEG2, AC3 and AAC audio from PS , TS and dvr-ms files upto HD resolution (max 2000x1200) at 25fps (PAL) and 29.97fps (NTSC). The h.264 version is still in beta test and available for donators.
Comskip is a free mpeg commercial detector. It is a windows console application that reads a mpeg file and analyses the content based on a large amount of configurable parameters. After analysis it generates a file in various possible formats containing the location of the commercials inside the mpeg file.