Apple M8728Z/A User Manual - Page 225
:2 Pull-Down, Working with NTSC Video, Working with 2:3:3:2 Pull-Down
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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. ABCD AAB B B C C DDD Field Field Field Field Field Field Field Field Field Field 121 2 121 21 2 3:2 Pull-Down Before (23.98 fps) A B CDA BC DAB C DAB C DA BC DAB CD A A B B B C C DDD A A B B B C C DDD A A B B B C C DDD A A B B B C C DD D A A B B B C CDDD A A B B B C CDDD 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). Chapter 13 Working with 24p Video and 24 fps EDLs 225