l know this isnt exactly cctv however you guys are far more knowledgable than most.I have a bar that has eleven direct tv recievers that are modulated co l can watch any recieiver channel on any tv.I want to connect a dvd player to play comedy sketches of classic movies ie porkys,old school,comedians etc in between playing dj music.l want the dj to be able to switch all my tvs to the dvd player with one switch (not to go to each tv and change the channel) and then be able to switch back and play regular cds at the dj booth.The skits will be about a minute long every half hour or so.l am not sure how to do this ,maybe an a/b switch at the dj booth and some sort of switcher at the combiner or modulator???
Any help would be appreciated or any contacts or links to people who know would be appreciated.

you need a video injector. The dvd signal will be a normal CATV channel. I'll see if I can find a link.