I got VLC because it has all the codecs to play the files I'm trying to watch including MKV. the problem I am experiencing is that in certain parts of the show the video will just freeze for several seconds while the audio plays smoothely, then finally it will return to normal. generally after this has happened once, it becomes more and more frequent and sometimes the VLC player will encounter a fatal error. I have noticed that the most often when I am encountering this problem it's at a very active point in the show liek a fight scene or something. this made me think that the problem could possibly be related to my video card but I never have any other problems playing video, only with MKV.