Now obviously the disk has to be one or the other but just how can you tell
the two file formats apart ?   (pixel count/frame rate ???)

NTSC has a resolution of 720x480 pixels (typically 29.97 frames per second :)
PAL has a resolution of 720x576 pixels (typically 25 frames per second)

Have fun,
Shay (There is *much* arcana in TV, video and film formats. Trying to understand it will warp your mind)

--
=========================== Shay  Telfer ================================
 Perth, Western Australia   Technomancer  Join Team Sungroper in the
 Opinions for hire              [POQ]     2005 World Solar Challenge
 [EMAIL PROTECTED]         fnord     <http://sungroper.asn.au/>