Same problem here. I read that using TVersity it can be possibile to watch file .mkv even with DSM-510, that natively doens't support H264. I tried several times, but without success. I'm using TVersity 1.6 and Vista Business. When I try to play a .mkv D-Link shows a popup with error "The request media content is no longer available". But If I look at Status, I see in section Streaming --> DLink DSM 510...
Is there a particular configuration to be done to play .mkv on 510?
Can you help me? Or which is the best format and bitrate to play HD on 510?