streaming iTunes movies from a wireless media device

Hi, I've just bought a Seagate Wireless plus storage device so that I can store movies on there for the kids when we go on holiday and stream to their iPads. Unfortunately when I try and stream the m4v iTunes movies they won't stream. `it looks like files need to be MP4, the device does suggest other players e.g. Infuse 3, VLC but can't get these to work either. Any suggestions would be welcome. Many thanks, Paul