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2:2:2:2:2:2:2:2:2:2:3 Pulldown, sometimes referred to as 12:1 or 24:1 Pulldown, is used to convert 24fps video from film sources to 25fps for PAL video. Although not as common a method for standards conversion as simply speeding up the video by approximately 4%, it doesn't result in the slight pitch difference for the audio either. Like any pulldown pattern that doesn't repeat all fields, it results in a slight amount of judder due to a single Field being displayed longer than the 11 before or after, however it's less noticeable than in NTSC's 2:3 Pulldown, in which every fifth field is repeated.
Performing 2:2:2:2:2:2:2:2:2:2:2:3 Pulldown
2:2:2:2:2:2:2:2:2:2:2:3 Pulldown can be performed by DGPulldown, a utility for applying pulldown flags in a number of different patterns. You can find more information plus a download for DGPulldown on Donald Graft's website.