Inverse Telecine

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NNehring
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Posted Sat Apr 3, 2010 2:31PM
I have a DV video transfer from film, which came out Telecined. Should I leave it as is as an interlaced video, or do an Inverse Telecine and duplicate frames for a progressive video?  Which would be more useful to those who would purchase videos?

(Edited on 2010-04-03 14:32:50 by NNehring)
vesperstock
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Posted Sat Apr 3, 2010 2:55PM
Could you explain what you mean by "came out telecined"? Telecine is a process of transfering film to video, so your description doesn't help us get to a solution for you. Can you tell us the original speed at which film was shot (eg. 15fps, 24fps, 25fps, 29.97fps or something else)? What format is the DV copy? Was the film speeded up/slowed down at all during the transfer and/or were extra fields/frames added?
NNehring
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Posted Sat Apr 3, 2010 3:28PM
17.126 FPS was the original framerate, copied onto DV Video (Mini DV) at 59.94 fields per second, no change in speed.  I have AVISynth Scripts to restore the original progressive framerate, but iStockvideo wants 29.97 progressive or 59.94 interlaced.
vesperstock
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Posted Sat Apr 3, 2010 4:09PM
Hmm. Sounds like the original was 8mm shot at 16fps or 18fps and then telecined at 17.126fps (which is a compromise speed to get to 59.94 fields using a "pulldown pattern" which essentially doubles some fields/frames). If you restore the original frame rate to 17fps, you're right, that won't be acceptable for upload to istock. I suggest you upload from the video with interlacing and pulldown (which is what you have) and see if istock accepts it that way (eg. because of its historical nature and/or the aesthetic quality of old film). 59.94 fields per second is the same as 29.97 frames per second, so you should be good to go.
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