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How do you correct jerky playback on slowed down shots?
I have a shot slowed down to 70% in a programme, but the playback is very jerky, does anyone have any good tips for how to smooth things out a bit? It has been slowed down using ctrl click > speed. Due to the archival nature of the footage we don’t really have any choice in the matter.
Thank you!
Michael Lansdell
Online Editor,
Available Light Productions LtdMy system:
2 x 3 GHz Quad-Core Intel Xeon
5GB DDR2 RAM
512MB ATI Radeon X1900 XT
OS X 10.4.11
Final Cut Pro 6.0.4
Blackmagic Design DeckLink HD Extreme (6.6.2) -
11 Replies
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if you want to stick with FCP, make sure the “Frame Blending” box is check in the Speed Change dialogue box.
IMO, FCPs time remapping isn’t that good. I suggest taking the clip into Motion and using the Optical Flow feature. Motio will create new frames as opposed to just blending existing frames. I think Shake does this too.
Robert J. Grauert, Jr.
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Hi Michael,
I agree with Rob. FCP isnt great at this. Remember to render and set the render settings in the Timeline option menu to best.Try adding a field blend filter, can sometimes make it better.
Otherwise take that clip to ‘motion’. Its really easy to do, and produces much better results.
best wishes
Nick
Offline/Online Editor, UK
Mac Pro, FCP 6, AJA IO -
Isn’t Optical Flow available from directly within FCP6?
I’m not where I can see the manual.
there are some gotchas when sending a clip to Motion for Optical Flow analysis. to prevent most of them I usually export an uncompressed clone of my clip, trimmed out of the master clip. Sometimes Motion will try to analyze the entire master clip, that can take hours.
also, if your footage contains much motion blur, fast moving objects or camera and captured with a 1/30 or 1/60 shutter speed, Optical Flow can get really confused. If you have not shot this footage yet, or can reshoot it, try to shoot at 1/120 or 1/250 second.
bogiesan
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Hi, the footage is 1950’s archive, so a reshot isn’t really an option. The machine I’m on doesn’t have motion, if I get time I’ll try that on a machine that does though, thanks!
For now, I turned off the frame blending and deinterlaced the footage, so there’s non of that horrible ghosting and no two steps forward on step back malarky going on.Right, now I shall put my next question to the forum…
:o)
Michael Lansdell
Online Editor,
Available Light Productions LtdMy system:
2 x 3 GHz Quad-Core Intel Xeon
5GB DDR2 RAM
512MB ATI Radeon X1900 XT
OS X 10.4.11
Final Cut Pro 6.0.4
Blackmagic Design DeckLink HD Extreme (6.6.2) -
[Michael Lansdell] “so there’s non of that horrible ghosting and no two steps forward on step back malarky going on”
This sounds like an interlacing issue.
Make sure that all the field-order setting.
You are not working with PAL footage, don’t you?
Rafael -
Hi Michael,
I sow that you are based in the UK, so I may suppose you are working in PAL.
Are you working with footage with the “shift-fields” filter on?
Rafael -
Isn’t Optical Flow available from directly within FCP6?
I believe the answer is no.
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[Michael Lansdell] “the footage is 1950’s archive, so a reshot isn’t really an option.”
This footage must have originated on film and must have 2:3 pulldown. Retiming without removing the pulldown will be problematic. You’ll probably need to use Shake or AE to remove the pulldown. While you’re at it, you can retime the footage there, as well.
Arnie
Post production is not an afterthought!
https://www.arniepix.com/ -
Has nobody other than me had that weird issue with Optical Flow when it gives you that “watery” effect surrounding the moving object?
Is this just me?
Best
Harry
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My experience (even back years ago when I was in a linear suite) has been that usually the smoothest slow motion can be achieved at 66.6% or 33.3%. Your clip is set to 70%, changing it to 66% won’t look all that different.
Of course, I think these frame rates work in NTSC because you are going from 30 fps (100%), to 20 fps (66.6%), to 10 fps (33.3%). PAL might be different.
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