Apple Cinema Tools 4 Uživatelský manuál stáhnout pdf (Strana 225)

3:2 Pull-Down

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

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)

A BA B B CC 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 BB CC D D D A BA B B CC D DB 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).

225Chapter 13 Working with 24p Video and 24 fps EDLs

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Apple Cinema Tools 4 Uživatelský manuál Strana 225