If you have get some AVI files encoded with Divx, MKV or MP4 video encoded with H.265 codec, your WD TV Media Player will definitely fail to play them via USB stick. To fix this codec incompatible issue, you can follow this video.
Official Guide(More details here): http://www.multipelife.com/wd-tv-not-play-video-from-usb-stick.html
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