Hmmm, I’ve actually heard the exact opposite from a couple different trailer editors recently. They were saying that the “out” is really where picture goes “out” (i.e. meaning, picture stops – or no picture). So for a ;30 second spot the out point should be placed at 01:00:30;01 if you want exactly ;30 seconds to be spit out and the last frame of picture to be at 01:00:30;00.
Might be good to hear a couple others as I’m still getting conflicting feedback.