Synchronized multi-screen setups generally work best with the use of:

• Brightsign Mediaplayers (very reliable but complicated to implement), 
• Dulltech Mediaplayers (easier but with certain limitations), 
• or a set of Raspberry Pi players with an ethernet hub (also complicated and we’re still testing the reliability at this time)

For certain projects which just need a very quick sync solution, you can use the screens’ built-in media players with USB sticks. 

• Use exactly the same model of screen, for example Philips 48PFK4100, or Philips 49PFS4131
• Try to use the same kind of USB stick for every screen if possible (better quality USB sticks tend to give better results)
• Your video files should be encoded as .mp4 with the same settings
  • generally 1920x1080p, 12 megabit per second or so
  • CBR (constant bit rate) with tend to work better than VBR (variable bit rate)
  • if your video is only a couple of seconds or minutes long, copy / paste the material into a longer sequence so that you have a longer mp4 file… for example 15 minutes.
  • it should be self-speaking, but all files should be exactly the same length.
  • make sure that there is only one video file on each USB stick
• Use one remote control – for all your screens simultaneously – to select the file and initiate playback
  • it may take a number of attempts to get all your screens to start together, but once they are running, they should loop and stay in sync without problems
  • double check the that each screen is set to loop the playback of your file, and in the same way: ‘repeat title’ rather than ‘repeat all’
    • it may be useful / easier to setup each screen individually first
  • sync will not be a temporally perfect, frame-locked situation, but good enough for certain projects

PUB used this technique quite successfully at de School.

[photos]