Video in background over several responses?

[doug]

I want to use MediaLab to have subjects view a video of a street scene and click buttons on screen or press keys when they see certain events (stop light, child in street) in the video. I can't get this to work - I thought I could put the video as a background video to the que file within the exp file, but the video doesn't play when the que file starts. If I put it as a background to a scale response, it starts over with each new question. Is there a way to have the video play in the background continuously and have subjects respond to several events in it? I'd prefer this be done entirely in MediaLab even thought the timing is not as good as DirectRT.