What video encoding methods are supported. It sounds as if MP4 is not supported by the TV.
I have the following: Samsung LED TV UN40ES6100F, Samsung Galaxy Tab 2 10.1 and Western Digital MyBook Live 3TB. The TV and MBL are wired network connection. Files are stored in private shared folders on MBL. I am able to stream MP4 videos from MBE to tablet with NO problems. I can only stream MP3 audio to the TV. I can see the MP4 files on the TV but when I select a file to play, it keeps loading and finally times out.