2 pull-down, 3:3:2 pull-down, A b c d – Apple Cinema Tools 4 User Manual

Page 225

3:2 Pull-Down

3:2 pull-down is the same type employed by a telecine. See

for more information. Because 3:2 pull-down is the conventionally supported pull-down
pattern for NTSC devices, you need to use this pull-down pattern to record to an NTSC
device, such as an SD television, an MPEG-2 encoding device, or a high-end finishing
system.

Before (23.98 fps)

B B

D D D

A B C D A

D A B C D A B C D A B C D A B C D

B C

A A B B B C C D D D A A B B B C C D D D A A B B

C C D D D A A B

D D D A

B B

D D

A B C D

A A B B B C C D D D

Field

3:2 Pull-Down

After (29.97 fps)

One second

2:3:3:2 Pull-Down

Another type of pull-down you can use is 2:3:3:2 pull-down. 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

for details about this

pattern and the advantages it provides.

Although 3:2 pull-down 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 23.98 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).

225

Chapter 13

Working with 24p Video and 24 fps EDLs