Not sure if this question is really in the right category, but I'll be building what my boss eventually wants to do anyways in after effects.
Anyways has anyone ever played video's on multiple TV's before? ...I work for a small buisness and eventually my boss would like to have three TV's side by side and play that play a video on the screens obviously but then have all the screens conjoin together and have them play one big image across about 3 tv's like in Tim Hortons, or Mcdonalds for example. How the tv's in there show the menu then eventually switches and plays one big movie all across the screens.
The only thing I could think of is making 3 different movies and try to get them to all start at the same time.
If you are on a Mac, make those three videos like you are planning, put them into three different Keynote's or PowerPoint slide decks and then, have three Macs ready and loaded with those decks. In order to trigger / control /script those target Macs for simultaneous playback, use my KeyShowX. It's been used this way for many scenes in a lot of moves and TV shows, where multi-screen / multi-monitor setup is in use: