User guide

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Advanced 2:3:3:2 pulldown
Advanced 2:3:3:2 pulldown
Advanced 2:3:3:2 pulldown was developed as an alternative to the standard
pulldown method for making frame rate conversions in DV video. It is used to
convert 486p @ 23.98 fps video to NTSC (486i @ 29.97 fps) video. This
conversion is used when video footage is acquired by a DV camera at 23.98 fps
and recorded to DV tape with the recorder set for advanced pulldown (called
24PA or 24P Advanced mode on some devices). Advanced 2:3:3:2 pulldown
differs from standard 2:3 pulldown in that the two middle frames of the video
sequence are each converted to three video fields.
The following diagram demonstrates the process:
Advanced 2:3:3:2 pulldown is accomplished by representing the first frame of
progressive video (frame A) as two fields of video (fields a1 and a2), the second
frame (frame B) as three fields of video (fields b1, b2, and b3), the third frame
(frame C) as three fields (fields c1, c2, and c3), and the fourth frame (frame D) as
two fields (fields d1 and d2).
A B C D
a1 a2 b1 b2 b3 d1c3c2c1 d2
Progressive frames @ 23.98 fps
Video fields @ 29.97 fps
Frame A Frame C Frame DFrame B Frame E