normally wala, kaya lang ang problem sa Home Theater In a Box (HTIB), over time yung firmware hindi updated to play smoothly newer mkv (for newer/better encoding) (and a lot of people wont update the firmware even if they find one probably due to the fact that if it fails, yari)
that's why they get NMTs (HD Media player seperately). so normally, get the samples you want to play, test it out sa HTIB na target mo. but should be 95% sure most newer ones play MKV and MP4.