New Patreon Tier and Early Access Content available. If you would like to support AVForums, we now have a new Patreon Tier which gives you access to selected news, reviews and articles before they are available to the public. Read more.
HD is neither PAL nor NTSC but the frame rates are historically related. In ntsc countries the mains frequency is generally 60Hz. NTSC is nominally 30fps (29.97fps). In PAL countries the mains are 50Hz and PAL is 25fps.
HD camcorders for 1080 progressive content use double the normal frame rate.
US based 2 x29.97fps UK based 2 x 25 fps.
For burning to DVDs for PAL countries 720 x 576 25fps is a lot easier to divide the frame rate by half. Same for NTSC 720 x 480 29.97 fps.