Go Back To Your Cave!
I think it’s funny that you can’t review or feature a video streaming device on the Internet without those last five guys on the planet coming into the comments section asking if you can stream MKV files to it over your home network.
It’s like the FLAC guys for audio stuff - “FLAC-compatible, or I do not buy.” Well, given that it’s a $39.99 device that comes with $1.99 headphones, I really doubt you’re going to “be sure you can tell the difference” between 256-bit MP3 and FLAC on this awful device.