From Samsung official website, we clearly know that Samsung TV is only compatible with MP4 in H.264/MPEG-4 AVC video codec and AAC audio codec. However, MP4 is a container format which contains various kinds of video and audio codecs. Once the MP4 files can't meet the requirement of Samsung TV input format, you'll get into trouble to play MP4 in Samsung TV.
To solve "Samsung TV not playing MP4" issue, a widely recommended solution is to convert MP4 to Samsung TV more compatible MP4 format.
Tutorial on How to Play MP4 Video on Samsung TV at http://www.videoconverterfactory.com/tips/samsung-tv-mp4.html
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