MP4 Files Not Play on Samsung Blu-ray Player

Some MP4 files not play on Samsung Blu-ray player I have played many videos of many file types on my Samsung BR player by a usb memory stick. When I use the usb stick it says "file type not supported". I have changed files that won't play to the same as ones that do, such as MP4 but they will not play when others do. All connections are the same, network is working, I am at a loss. Play loca...
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