I am using Plex on a 5-year-old MacBook Pro connected by ethernet through a router to a Samsung plasma tv. My media are on a WD external hard drive connected to the computer by USB, and computer to DVD player using ethernet. About half my movies register as "format unsupported," even those I have watched before when connected directly to the DVD player. Every time I begin a compatible movie, it plays for a few seconds and then stops, and I get the message "device disconnected. Check your connections."
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