walang problema ang filename niyan. ang encoding yan. hindi porke't mkv kasi yan pareho yan lahat. mkv is just a container file, it could mean the video is encoded in say h264, xvid, x264 etc. same goes for audio
get something like mediainfo, tingnan mo kung ano ang encoding the files sa loob ng mkv file na yan. then check mo kung supported yun ng media player mo
ano ang file size?