To stream region-locked DVD on Xbox One S, you can follow this video to rip and convert DVD to Xbox One S supported video format then play them via USB.
Official Guide(More details here): http://www.pavtube.cn/rip-dvd-to-xbox-one-s.html
Pavtube ByteCopy: http://www.multipelife.com/bytecopy
Pavtube ByteCopy for Mac: http://www.multipelife.com/bytecopy-mac
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