I use Isedora Media Server
with my Panasonic TV, it has VLC embedded in it so it plays all the video content that I have tried. ITunes movies play fine through it.
I would agree with Adrian that the Panasonic does seem fussy about what it will and won't play, some .jpg still images will not work with it and some will, also the Media Player won't play music, for that one has to put the music on a USB dongle
I'm toying with getting an Apple TV, but that probably won't play .wmv files which Isedora does play
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