They do worst than that... Now, they advertise the show you are presently watching before they start showing you the commercial advertisement, making it near impossible to know if you are still watching the show or the advertisement of the show (Discovery Science is the worst in that regard).I've been using VideoReDo TVSuite H.264 (legal) on a second computer for commercial removal. Broadcasters are getting savvy about comskip utilities and are constantly bumping commercials up against programming without any breaks whatsoever. I find it faster to manually skip through the recording, rather than using Ad-Detective, mark and remove commercials. It does a fair job at remuxing to h.264, but the files always end up larger than Handbrake. So I batch the edits in VideoReDo, then batch Handbrake to convert overnight, then use Renamer to sort the episodes for TV-Series. Any recordings that we don't save for TV-Series, we just use the skip feature in MP to get through commercials.