This is an efficient but low-quality playback option used for previewing 23.98 fps
footage on an NTSC monitor. Few systems can reverse this kind of pull-down, so you
should never record footage with this kind of pull-down. This option is available for
situations when processing power is at a premium and your system is unable to
generate 2:3:2:3 pull-down or advanced pull-down during playback.