Streaming movies on my drive through my ps3 wirelessly

I have a Wesrtern Digital My Book World Edition 1 tb external hard drive.  I try to stream the movies I have saved on the drive through my PS3. when the movie starts to play the audio is not in sync with the movie, and it stutters as well. What can I do? Is trying to do this wirelessly the cause of my problem. Any help is much appreciated.

And how does this relate to the WDTV products? You need to go to the correct forum for your device.