Try going to the APP store and looking for MXPlayer. I noticed that MXPlayer plays a lot more versions than stock player.
MXPlayer has free version, and pay version. Only difference is ads, but they do not get in the way while playing video. The thing I like about it is that if you slide finger left to right, it will move movie accordingly (like fast forward), and if you move it up and down, it will change volume accordingly. I think that is pretty neat.
Good luck