Quote:
Originally Posted by cbenham
Where are you going to get the bottom half of that field that gets dropped and the top half of the next field [also dropped] that completes the image for that film frame? 12 fields get dropped per second. http://en.wikipedia.org/wiki/Kinescope |
I think I know what you're getting at, but let me try to explain it this way-- the resultant kinescope film of your broadcast is going to be 24fps, rather than the 30 fps video rate of the original transmission. For each of those film frames, though, it's important to note that the exposure mechanism of the kinescope machine held the film in place until at least 2 video fields were exposed, meaning that the kinescope film image is just like any other strip of movie film: frame-based, rather than field-based.
If your question above refers to the now-missing 6 frames per second that were lost in the kinescoping process, then the answer is: they no longer exist, but also were never part of the kinescope film in the first place, so they are irrelevant to the discussion.
If your question refers to the standard 2:3 pulldown field blending that is part of making film conform to NTSC video transmission, then the answer is: all that is done when the 2:3 pulldown is created is the duplication of 1 frame in every 5, which turns one second of film (24 frames) into one second of video (30 frames). The duplicate frame is hidden by weaving its separated fields into those of the existing 4, in a standardized pattern. And today, it is indeed trivial to un-weave those fields, combine them back into frames, and then eliminate the duplicates to recover the original 24fps frames of the kinescope film.
So the short answer is: assuming the kinescope film was properly and professionally transferred, the full frames are all there-- it's just that their respective fields are slightly jumbled in places...
-Kevin