Smart TV is a fast moving technology at present. Most major manufacturers have apps for MKV files. Not all LG TV's will play MKV files. Sme older models could play the video, but did not have any audio. Televisions from Samsung and Sony play these files as well.
AirPlay will not work with the old version of Apple TV. It requires the new Apple TV or some other equipment that can connects with AirPlay (such as audio equipment) that can play your digital files as AirPlay streams them from your computer.
Apparently you can't.However for about a hundred dollars (plus an external usb hard drive) you can watch those formats with a media player.The WD TV seems to get great user reviews.
Yep
Yes! With apple TV
Though Apple TV can stream your video files from computers, it has video format limitation. It only support H.264 or MPEG-4 video format. If you attempt to sync unsupported video format like AVI to Apple TV, it will draw an error message from iTunes. In order to stream AVI video files to Apple TV successfully, we need to convert these AVI movies to a format compatible with iTunes and Apple TV The following will introduce a step by step guide on how to convert AVI to Apple TV supported format on Mac or Windows at http://ipad2software.blogspot.com/2012/03/how-to-convert-and-stream-avi-to-apple.html
mp4, flv, mkv, avi, wma
They tie you to your TV at home. It limit your devices to play different formats of files.
Apple TV+ is a streaming service featuring
Yes, the built in airplay function will do this. You will need an Apple TV to stream to, however
There is no such Apple product by the name of 'Apple Express'. Unless you are referring to the Airport Express, then yes, it does work with Apple TV.
No, Apple TV is an exclusive servise to only Apple devices.