101
That creates a situation shown in this drawing.
Film
1
Film
2
Film
3
Film
4
A1 A2 B1 B2 B3 A1 A2 B1 B2 B3
From the first film frame, two video fields are derived. From the second
film frame, three video fields are obtained. From the next film frame, two
video fields are derived and so on.
The Pull-Down information is created as follows:
Every time, the video field corresponds to a new film frame, the letter
changes either from A to B or from B to A, and the number is set to 1. As
long as no new film frame is taken, the video fields are counted,
beginning from 1. Consequently A2 is the first repetition of A1. B2 would
be the first repetition of B1, and B3 would be the second repetition.
In spite of the fact that the name Pull-Down comes from the working
practice in the NTSC systems, where on a telecine the film is running on
23.976 fps and gets converted to 29.97 fps, the definition of Pull-Down
information on the IVS can also be applied to any combination between
HD-Link speed and film camera speed.
Although this information shows the HD-Link mode to be in interlaced
mode, the same system works also for progressive mode. The system only
uses half of the duplicated images.
Note: Pull-Down information is only inserted, when time code is actually
recorded on film. If there is no time code recording, for example
because the camera is not running on a time code speed, only A1
will be displayed.
Summary of Contents for K2.47050.0
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