1) The video format is x265, please use lastest version of "Potplayer" to playback. You can find it on http://www.potplayer.org/2) The mkv include one japanese AAC audio track only, we provide one lossless audio track for you as well, you can plug-in to playback.3) The mkv include one original Japanese sup subtitle track and one Chinese subtitle track provided by J.X.Encode by MGRTChinese subtitle provided by J.X