I am preparing an experiment which includes presentation of few video commercials (30 seconds each). I would like to put markers (code values) not only at the start and end of each of them, by also in the middle (in certain points which I choose, e.g. after 2.3 second from the start).
Anyone has idea, how to do that?
I would appreciate your help.
I haven’t found any clues in this forum and in any other places.