Polytropon [2016-05-23 13:49 +0200] :
> I've installed mplayer which plays video and audio in MKV format just
> fine. Maybe you are missing a codec that is required (because MKV
> basically is a containter format, like AVI, with video and audio and
> maybe other data in a specific codec)...
Another great choice is multimedia/mpv.
Niklaas