Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
PAL and NTSC are different methods of broadcasting. Video files, however, are not broadcasted directly and are therefore neither PAL nor NTSC.

However, some people use the video frame rate to determine whether a certain file would play best on PAL or NTSC equipment. You can find out the frame rate by opening the file in QuickTime Player, then doing a Show Movie Info. PAL is 25 frames per second and NTSC is 29.97.
 
PAL is 720x576 pixels and runs at 25 frames per second.

NTSC is 720x480 pixels and runs at 30 (29.97) frames per second.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.