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Old 03-05-2018, 10:28 PM   #1
Bassman
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Default 30p to 24p Conversion

Hello,

I have shot a lot in 60p and converted to 30p or 24p a lot with success. I am experimenting with shooting in 30p and not having the same success with conversion.

If I put 30p footage on a 24p timeline and the default is nearest neighbor, the footage has a strange awkward stutter. Like the timeline is having issues playing it back. But the buffer is full. I tried frame blending, but it was the same. I tried exporting an HXQ file and then placing back on the timeline but the stutter is still there.

It would seem that only being 6 frames away the conversion would not be a problem. Since this is not interlaced, I am not expecting a pulldown error.

So, are there any tricks I am missing to get 30fps footage to look good on a 24p timeline?

Thanks
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Old 03-05-2018, 11:19 PM   #2
Andreas_Gumm
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While you set "nearest neighbourhood" it is absolutely impossible to have fluid motion without stutter.
It will simply discard 6 frames only!
There is no good way to convert progressive footage 30 fps -> 24 fps.
Maybe SNEL Alchemist XF software can help here. They provide a test version.
Don't know if the test version provides full feature set without limitations.

Andreas
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Old 03-05-2018, 11:52 PM   #3
antonsvideo
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try optical flow, it should look better than nearest neighbor or frame blending
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Old 03-05-2018, 11:56 PM   #4
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Quote:
Originally Posted by antonsvideo View Post
try optical flow, it should look better than nearest neighbor or frame blending
Yes, but it will cause artifacts on fast motion, on objects who are moving into or out of the frame and it will even cause morphing effects on scene changes.

Andreas

Last edited by Andreas_Gumm; 03-06-2018 at 01:46 AM.
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Old 03-06-2018, 05:50 AM   #5
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Thanks for your input. No big thing I just thought if I did shoot in 30p it would be nice to be able to go to 24p. Yes, Optical flow is good and bad at the same time. Too risky to depend upon.
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Old 03-06-2018, 07:51 PM   #6
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Alchemist XF will do this really well - Optical flow, as you say, on most images with fast motion, is very poor.

Paul :-)
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Old 03-17-2018, 07:42 PM   #7
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Quote:
Originally Posted by Andreas_Gumm View Post
(...)
There is no good way to convert progressive footage 30 fps -> 24 fps.
(...)
I'd only wish I could tell my Android smartphone not to record at 30fps... ;-)
It's bad if you mix such material with other 24p material.
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Old 03-17-2018, 10:29 PM   #8
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Shooting in 60P gives a lot more freedom. Smooth motion, easy direct transfer to 30P and acceptable transfer to 24P. It is because of all those extra frames that are closer to the timing of frames for the slower frame rates.
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Old 03-18-2018, 02:38 AM   #9
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Quote:
Originally Posted by Steady Hand View Post
I'd only wish I could tell my Android smartphone not to record at 30fps... ;-)
It's bad if you mix such material with other 24p material.
you can

install the free app, Open Camera, then you can set the frame rate
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Old 03-18-2018, 03:22 PM   #10
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"Alchemist XF will do this really well"

But the price is very high: 10.000 eng. Pound, per license!
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