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Slow Motion/Optical Flow
What is the best way to get slow motion in Final Cut Pro?
I keep hearing about this “great” thing called Optical Flow in motion, however, when I try to use it, I get a message saying “disk space is too low to use optical flow”. Is that normal? Does it work? How are the rendering times with that? How much space does it actually take up?FCS is such a huge software that I have so many questions… however I can never think of or remember them.
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3 Replies
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Yes – it is normal – especially if you’re analyzing a clip that is long in legth. Optical flow analysis takes an incredible amount of disk space at times – and you really need to have a lot to even be able to think about doing optical flow retiming.
Optical flow does blow away time remapping in Final Cut – so if you can do it, don’t mind waiting, and have the disk space then it definitely is worth it. The workflow is pretty simple – from final cut right click a clip and send to motion – from there you can set the optical flow parameters and I’m sure you’re familiar with them since you’ve already done them…
BTW, you can set the cache directory that motion uses to store optical flow data in the motion 3 preferences. It’s possible you may have large files there that you don’t need and can delete. Again, these take up a lot of space.
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Paul Escandon
Producer | Director | Editor
Apple Certified Trainer – Final Cut Pro
Oremus Productions
http://www.oremusproductions.com
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Adjunct Professor of Media
John Paul the Great Catholic University -
[Kyle Troxell] “What is the best way to get slow motion in Final Cut Pro? “
The answer to this question is… what looks good to you eye? There are many ways to get good slo-mo in FCP. Optical Flow is one method but not the only answer to all slo-mo.
[Kyle Troxell] “I keep hearing about this “great” thing called Optical Flow in motion, however, when I try to use it, I get a message saying “disk space is too low to use optical flow”. Is that normal? Does it work? How are the rendering times with that? How much space does it actually take up?”
Well, this all depends on your media drive and how much is on the drive.
Yes, Optical Flow is awesome but there is a hit in rendering and analyzing video times. The major issue that people run into is length of time to render and analyze. All of this factors upon the length of your clip. If what you want to analyze is only about 10 seconds and your clip is 2 minutes, Optical Flow will analyze all 2 minutes. The way to circumvent this issue is to write a new file with the proper amount of time you want to apply the Optical Flow slo-mo.
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Wayne Carey
Schazam Productions
http://www.schazamproductions.com
https://blogs.creativecow.net/waynecarey -
[Kyle Troxell] “What is the best way to get slow motion in Final Cut Pro?”
Phantom HD! 1,000fps!
https://www.visionresearch.com/index.cfm?sector=htm/files&page=camera_HD_new
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog
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