The CPU in the DS918+ is not powerful enough to transcode the video in real time.
Look at Handbrake or similar tools to convert the video from VC1 to H.264 or H.265, so it will direct play on your Plex clients.
Edit: See this thread for a very quick guide to converting DVD/Blurays with Handbrake. It will help get you going and you can adjust as needed.
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