Hi
Kodi has two primary players: VideoPlayer for (video) and PAPlayer for audio.
My understanding is that MKA support isn’t 100% implemented in Kodi, but playback should work. For example: if you want gapless playback, I believe you’d need to use VideoPlayer instead of PAPlayer for playback. At least that was the case at the time.
There’s some discussion here about matters: .mka files containing 5.1 DTS/DTS-HD + 2.0 flac tracks playback issues. Keep in mind that this post is three years old, so I suspect there have been a number of improvements since.
Regarding M4V: I would have expected that to contain video, not just audio. If you send me a sample file, I could check things are doing what they should be doing here.