You can play high-definition videos (HD, Ultra-HD, or 4K) in the Movies & TV app on Windows.
To enjoy high-definition quality, make sure that:
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The video itself is HD or 4K (not SD)
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Your hardware (device and screen) can play high-definition (check the manufacturer’s website)
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If you're using an external screen, it’s connected using the appropriate cable—HDMI, DVI, or DisplayPort (check the manufacturer's website)
Note: Internet connection speed may also affect streaming video quality.