I am able to use upnplay and vplayer to stream from my MyBook Live using the Twonky server to provide the access. No problems, all my movies are mkv encoded h.294 with aac (usually) sound. I can also see the media player stream shared from my PC. It looks like upnplay is the best bet as it uses an installed player instead of the default player, which didn't play my mkvs.
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