3:3:2 pull-down, Ab c d – Apple Cinema Tools 3 User Manual
Page 195
Chapter 11
Working With 24P Video and 24 fps EDLs
195
2:3:3:2 pull-down
Another type of pull-down you can use is 2:3:3:2. As with 3:2 pull-down, the “3” in the
pattern represents three fields, where one redundant field is added to the original two
fields of a frame. See “
Working With 2:3:3:2 Pull-Down
” on page 188 for details about
this pattern and the advantages it provides.
While 3:2 is the conventionally supported pattern for NTSC devices, you may want to
use 2:3:3:2 pull-down to output video that you can record to tape and yet later convert
back to 24 fps with the advantages of 2:3:3:2 removal (the ability to remove the pull-
down without the recompression and re-creation of any frames).
2:2:2:4 pull-down
The 2:2:2:4 pull-down pattern is not typically supported for recording devices or
cameras, but it requires the least amount of processing power so it’s a good choice if
you are editing 23.98 fps video and want to preview it with as many real-time effects as
possible on an NTSC monitor. This pattern is also useful if you need to output video for
display from an older, slower computer (or a computer with a heavy processing load)
that drops frames when you try to output 3:2 or 2:3:3:2 pull-down video.
A
B
A
C
D
C
D D D
Before 2:2:2:4 pull down
24 fps frames
One second
After 2:2:2:4 pull-down
NTSC frames (divided into fields)
A A B B C C D D D D A A B B C C D D D D A A B B
C D D D D A A B
C
B
D
C
D D D A
B
A
B C
D
C
D D
C
D
A
B
C
D
A A
B
B
C
C
D
D D
D
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
B
A
B
C
D A
D A
B
C
D A
B
C
D A
B
C
D
A
C D
B
C
B
UP01101.Book Page 195 Thursday, March 10, 2005 3:16 PM