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Removing Strange Pulldown Patterns
Anyone know of a good way to do non-standard pulldown?
I have this old TV show (from the 60’s) shot on film that was given to me on Digibeta. I think it was telecined to NTSC, then converted to PAL, then converted back to NTSC. It has what is essentially a 6:5 pulldown pattern. I normally use JES or Nattress – neither of which can handle this.
I’ll probably just convert to 30p if I can’t figure anything else out. But since this is ultimately for the web, that useless 6 redundant frames per second eats into the quality/size ratio for the various web compressions I need to deliver.
Any ideas? There’s over 20 tapes and no budget for a Teranex or anything like that.
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3 Replies
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Im facing a similar problem with 24 to 25, with a 12-13 pulldown. (every alternating 12 / 13 frame a frame is introduced with one field duplicated. Thus i have interlaced frames on half of them (or, field reversed progressive frames)
What i’m working on right now is kinda complicated, but fun.
Using a key image (1 pixel horizontal black/white lines) to key the original with the original at a 1 frame offset.
Thus restoring the field reversed frames.Next is a macro to cut out the unwanted frames.
You could do something similar, but if the cadence is not constant you will go nuts….
hth
Bouke
http://www.videoToolShed.com
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[Sean ONeil] “I think it was telecined to NTSC, then converted to PAL, then converted back to NTSC.”
If this is the case any field/frame relation with the source 24P was blown away when the 29.97 telecine was PAL converted. The standards conversion process generates its own unique fields/frames.
Matt
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[Matthew Nelson] “If this is the case any field/frame relation with the source 24P was blown away when the 29.97 telecine was PAL converted. The standards conversion process generates its own unique fields/frames. “
True, but it can still be repaired. There are tools capable of deinterlacing anything, and there are tools which can intelligently remove duplicate frames and output a desired framerate. Unfortunately I can’t find an app that combines both techniques in order to solve this particular problem.
Good news is I contacted the author of JES and he says he’ll be able to add this feature.
Sean
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