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What Shaga said, you will be better off posting in something like /r/AndroidQuestions
or the official minix forums
This is for devices that run the official AndroidTV operating system https://www.android.com/intl/en_au/tv/
In saying all that, you could provide more information than what you have i.e what the video file format is, is it playing from wifi/lan/usb/sd etc.
First 2 things i would try are
Does the video play fine on a laptop or computer?
Have you tried installing a different video player, i.e VLC or Kodi and get different results
This reddit is for official AndroidTV.
"Discussion of Android TV devices. ADT-1 Nexus Player Nvidia Shield Razer Forge TV Xiaomi Mi Box"