Apple Final Cut Pro 5 - Manual (Page 1314)

Chapter 23 Using RT Extreme 527
III
 2:2:2:4: This is a good choice if you are editing 23.98 fps video and want to preview
video with as many real-time effects as possible on an NTSC monitor. Because it
requires less processing, the 2:2:2:4 pull-down pattern is also useful if you need to
output pull-down video from an older, slower computer (or a computer with a
heavy processing load) that drops frames when you try to output 2:3:2:3 or 2:3:3:2
pull-down video. Keep in mind, however, that this pull-down pattern is for rough
draft video only. While you can record video output with 2:2:2:4 pull-down using
any NTSC camcorder or deck, there will be more noticeable temporal artifacts
(stuttering of frames) than with the other pull-down options.
The following two patterns are available when your sequence has an editing timebase
of 24 fps and you choose a 25 fps external video output.
 24@25 Pulldown: In this pattern, 12 progressive frames are displayed, followed by
13 re-interlaced frames. For 25fps output, this pattern has the best perceived
motion quality.
 24@25 Repeat: In this pattern, 24 progressive frames are displayed and the 24th is
repeated to create the 25th frame. This leads to a noticeable stutter every second,
but requires less processing.
A B C
C
D
A B D D
Repeated frame
24 fps
2:2:2:4 pulldown
One second
1 2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 6 7
1 2 3 4 5 8 9 10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
12 13 14 15 16 17 18 19 20 21 22 23 6 7 24
Interlaced frames
One second
1 2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 6 7
1 2 3 4 5 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 24 6 7
Repeated frame