A pulldown converts non-interlaced film to interlaced video sequences.
The frame rate of the film sequence (normally 24fps)
The frame rate of the output video (30fps for NTSC, 25fps for PAL)
The frame offset where the pulldown pattern begins.
The field dominance of the video.
Odd Dominant (Field 1)
The odd scanlines (1,3,5…) appear in the first field of the video pair.
Even Dominant (Field 2)
The even scanlines (2,4,6…) appear in the first field of the video pair.