Are you confused that your Vizio TV even can't recognize USB storage devices or you can play certain MP4 files from USB on Vizio TV but fail to play other MP4 files due to the unknown reasons. Never mind, this video will give you helpful solutions to let the MP4 file work properly on Vizio TV from USB.
Official Guide(More details here): http://www.pavtube.com/play-mp4-on-vizio-tv-from-usb.html
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Pavtube Video Converter for Mac: http://www.pavtube.com/video-converter-mac/
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