I remember when I used to use MythTV's commercial skipping that if it got fooled then the same things that fooled it would fool you too. So you would sometimes

I remember when I used to use MythTV's commercial skipping that if it got fooled then the same things that fooled it would fool you too. So you would sometimes miss a chunk and never know it other than coming away with an impression of a disjointed plot. Even though it did a good job and rarely got it wrong the rare wrong time was enough to make me stop using the commercial skipping. With MythTV you still had the complete file and could go back and check if you were suspicious. In this case the only way to tell would be to find the file somewhere else and compare.