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From the rst lm frame, two video elds are derived, the
second lm frame, three video elds are derived, from the
next lm frame, two video elds and so on.
The White Line ag works as follows:
Every time, the video eld corresponds to a new lm frame,
the letter will change either from A to B or B to A and the
number will be set to 1. As long as no new lm frame is
taken, the video elds are counted, beginning from 1.
Consequently A2 is the rst repetition of A1. B2 would be
the rst repetition of B1, B3 would be the second
repetition. On every A1 or B1, the selected video line will
get set to video signal white, indicating that only these
video frames correlate one-to-one to lm frames. The
duplicated video elds are not marked.
In spite of the fact that the name Pull-Down comes from
the working practice in the NTSC systems, where on a
telecine the lm is running on 23.976 fps and gets
converted to 29.97 fps, the denition of Pull-Down
information on the IVS can also be applied to PAL and to
lm speeds other than 23.976 fps.
Note: The insertion of White Line ags is only done,
when timecode is actually recorded on lm. If
there is no timecode recording, for example
because the camera is not running on a time-
code speed, no White Line ag is sent out.
Note: The White Line has priority over VITC lines. If
the same line is selected for White Line as well
as for VITC, White Line will appear.
Video-Ait-Sytem