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Keycode number fields



I have received my first telecine with Keycode windows and I am
unclear as to what is the precise information conveyed in the last
alpha-numeric field of the Keycode number.  I know that it is related
to postion in the pull-down sequence, but I was a bit confused when
reading the sequence frame to frame on the video.  Each five video
frame sequence of Keycode numbers ends A1  B1  B3  C2  D2, with each
value appearing to be the same for both fields of a specific video
frame.  
-- 
Phillip J. Wacker-Hoeflin             pwacker at oa.ithaca.edu
Post Production Facilities Supervisor                   
Ithaca College, Roy H. Park School of Communications           
Ithaca, NY  14850-7256                Phone: 607-274-1973