[PatK]

4k bluray playback from server without buffering

Do I understand correctly, you have blu-ray playback locally but not from a remote server? Networking issue? Perhaps one of the specific support forums is a better fit for this post?  What o/s system are you using? A proper debug log goes a long way around here.Log file/Advanced (wiki) along with a short description of your hardware, gfx cpu and connections.