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Very Odd 60 to 23.976 Conversion
Greetings,
I just received an edited clip from our client’s agency that is 1080 / 60p ProRes. Here’s the odd bit: it appears that the segment was cut @ 24p, then pulldown was added, and then the framerate was doubled. Why? I have no idea… too many layers of bureaucracy to get at the source, though.
So, the first thing I need to do is simply remove every other frame – after which I can remove the pulldown and get back to 23.976 (which is where I want to be, natch).
Do you have any idea as to how I might accomplish the removal of every other frame?
Thanks for your time
Doug Metz
Anode
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5 Replies
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If you drop a p60 in a p30 sequence, you get rid of half of the frames.
Hope the correct one.
rafael -
Step through the video frame by frame. You should see a pull down pattern of 3 repeated frames followed by 2 repeated frames. If that’s the case, you can try to remove the pulldown in Compressor using its reverse telecine function under the Frames tab.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/ -
That seems to have the desired result – exporting directly from QuickTime at half the frame rate does, too.
Now to figure out why I can’t cleanly remove the pulldown… every fourth frame is interlaced on my 23.976 output – be it from Compressor, JES Deinterlacer, or Cinema Tools. Actually, Cinema Tools spits out a file that is exactly opposite – every fourth frame is progressive, all else is interlaced.
Ugh.
Doug Metz
Anode
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[Doug Metz] “every fourth frame is interlaced on my 23.976 output – be it from Compressor, JES Deinterlacer, or Cinema Tools.”
That’s not a correct pulldown pattern. You should see 2 interlaced frames out of every 5, and they should be together.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/ -
Well, that’s the rub, Arnie.
When I remove the duplicate frames from the 60fps source, I see perfect 3:2 pulldown on the resulting output. The problem comes when I try to remove the pulldown to get to 23.976.
I’m seeing one in four frames as interlaced on the 23.976 output (see above post).
So I’m trying some other things (field order change, primarily) to see if that changes things for the better.
Any other ideas?
Thanks guys!
Doug Metz
Anode
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