I believe that probably there is no competent player as professional as KMplayer, because it has every single tool you would need. What do you want, to adjust the subtitle, to adjust the audio, to change the Pan & scan easily, to enjoy the easeness of the interface, to play incompletely downloaded videos, to play almost every video & audio file, easiest playback controls and what's more, IT IS ABSOLUTELY FREEEEEEEEEEEE!