Stuttering HD playback on LCD TV

Hi guys,

I recently obtained a nice 40 inch Samsung LCD TV and managed to hook it up with my MBP via XtremeMac DVI-HDMI cable....However,when i am playing high defintion movies, it seems to stutter constantly every 5 seconds.

The video playback is smooth using other monitors....

Any advice...???by the way, i am using VLC to play those HD movies which are primarily mkv files..