What is 2-3 pulldown?
2-3 pulldown is a method of converting a 24 frame per second film into 59.94 field per second NTSC. It does not apply to films encoded for PAL. It works by showing every second frame for three fields, resulting in a frame-to-field pattern of 2-3-2-3-2-3 … 2-3 pulldown is also known as 3:2 pulldown, but that name is confusing, since it is not a ratio. If you’re paying attention, you’ll notice that using this sequence will cause 24fps to be shown at 60fps, but NTSC is actually 59.94 fields per second. To compensate for this, before applying the pulldown sequence, the film is slowed down to a speed of 23.976fps, and the audio is also slowed down to compensate. The difference is small enough that you don’t notice (but if you’re writing a DVD player or ripper, you should!).
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