Hi. I discovered this thread while working on the same problem: trying to send a TTL during the display of a movie (.avi) stimulus----e.g., the movie we wish to display is about 6 seconds long and we wish to deliver a TTL to an external device during this 6-second clip. I've tried the suggested work-around but (a) the movie gets cut short or doesn't play at all and (b) the TTL is not successful... advice? thx in advance!
cheers