I would like to add that cutting commercials will fail sometimes when TV stations run a “crawl” or put up weather maps in the lower left corner, during storm events, breaking news, elections, or school closings for example. I think it is because the crawl and/or radar/weather image appears during both the show and the commercials, there is no clean “break” between the show and the advertisements for comskip or ShowAnalyzer to detect.
Another recent always-on “crawl” that comes up is a notice from the local OTA station that the bad greedy cable companies won’t pay to carry the local channels and tell viewers to complain to their cable company to keep carrying the nice friendly local OTA stations. Conversely, if you are recording clear QAM cable, they do the same thing and complain about the bad greedy OTA stations, telling viewers to complain to the stations to agree to your nice friendly cable company’s offers.
Just something to consider, especially if it is happening intermittently or with a channel that likes to do that (run continuous crawls even across commercials).