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Speeding up 23.976fps footage
I’m working with a single drone shot of 3 min, shot in 24 fps. The shot is smooth and looks great in real time, but I need to speed up a portion of it.
I thought this was going to be simple … but it’s not. When I speed up the footage, it doesn’t look good any more. It’s kind of jerky, like if it was skipping frames.
When I speed it up 200%, or 400% the footage, it’s OK, but anything in-between is far from perfect. Like 150% of the speed seems to be skipping frames.
Even if I could work with 200%, the speed ramping to get there look choppy in-between.
Is there some kind of math rules I should follow to make sure everything is as smooth as possible?
I have tried with Media Composer, Resolve and Premiere and I’m having the same result. Any thought?
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3 Replies
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I think that when you shoot in 23.976fps, you should also have set the shutter speed to 1/50.
This will give you a certain amount of motion blur.
You may have to use an ND filter to be able to adjust to the correct shutter speed.Regards
Douglas
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Speeding up basically skips frames. You could try frame blend options including optical flow. You might need to experiment with the best options in optical flow to get the smoothing you need. Also you might need to render to get smooth playback. Drones usually shoot H264 or 265 so they are taxing for the CPU.
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I would check Michael’s suggestions. If you are not satisfied with your result, I would check a plugin like RE:Vison FX Twixtor (OFX included): you will have much more controls over how the frame selection and blending happen over your timeline frame rate and timing.
I usually prefer After effects over Resolve to deal with any frame rates issues outside of the ordinary. You have many more controls and quality output is better.
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