itunes playback performance issue

All my iTunes library files are kept on the Airport extreme and so every time I play a movie, it skips, stutters, loses sound here and there, it's getting quite annoying. I noticed that if a movie is projected to the big screen using apple TV, it will buffer like a youtube video and plays absolutely fine. Also, if I go directly to the folder and right-click on the file, play with VLC, there is no problem. It would appear to me that the problem is with iTunes' playback of videos on my Airport Extreme.

Does anybody have the same problem and is there a solution?