When I run an event, I have one video with all my commercials in a loop, that I play 1 to 1.5 min at at time. I control them with a custom api, but sometimes I get out-of-sync just a second or two and would like to just go back a couple of seconds in the video to sync it where it needs to be. Another suggest is If I had video markers, I can just say go back to the last marker, or forward to next marker.