Recently I made a discovery in my media playing setup that I'd like to share, hopefully saving others a headache in the future.. I have a Sony BD-S580 Blu Ray Player, which has a DLNA renderer built-in. In order to save money I downloaded PS3 Madia Server, an open source an free DLNA server, on my iMac with Lion. All of my media has been transcoded using handbrake on the normal settings (h264, aac, mp4 container m4v extension). Problem was the bluray would read the files from the server and put (MEncoder) after the file names, but would say file format not recognized when I went to play them. Interestingly the bluray would label the files m2ts and would indicate the MEncoder was required to play them, To solve the problem, turn off MEncoder in PS3 Media Server. Go to the transcoding settings, highlight MEncoder, and hit the X at the bottom. My bluray now shows all the files as mp4, not m2ts and works great. Hope it works for others. And I've tested this on the linux, windows, and mac builds (1.5) for PS3 Media Server.