Last year I tested some apps and I thought I found the best player: Oplayer. I found it's much smoother and gave a better picture than VLC (VLC is too contrasty). I haven't used it for a few months. Because of this thread I checked the app again and to my horror, it's getting worse. Looks like there's some bugs from updates. It just isn't as smooth as before.
Why do I think it's a bug? Because I play both large files (>720 wide res) and ordinary file (720 wide res) and both are a bit stuttered just the same.
When I tested these files with other apps. In VLC the ordinary file played fine. No stutter at all. But the large file stuttered badly. Same as Azul Player which, I think, use the same engine as VLC.
Don't bother with yxplayer. It's really crude.
Looks like my search for the best player is on again.
PS1: OP, I tested 3 wmv clips I have and every apps mentioned above all played it with no problem.
PS2: Anyone who would like to have VLC should just buy Azul Player. It use the same decoder I believe. I tested many files and it behaved the same as VLC but gives a better picture (more natural, not too contrast like VLC) and it cost only a buck.