Hi! I've been trying to play animes without converting on my tablet for quite some time... The first player that worked really great was MoboPlayer (not Mobo Video Player just Mobo player) - it played all my videos flawlessly - and it still does, but it has a problem with subtitles as many other players... The problem arose when I tried playing an mkv with softcoded subtitles in it (.ass) - they didn't show up on whatever player I tried - I found some solutions: like extracting the subtitles (look up MKVToolNix), I also found an android app that could extract the subtitles - mkv SubExtract and finally I found MX Video Player and it actually played the mkv with subtitles! Hope this helps somebody! By the way I tried all this on my Zenithink ZT-280 C91, Android version - ICS. If you have any questions please feel free to ask.