Slowing down 50fps 720

[Jon Barrie]

Check out my tutorial on dslr over cranked frame rates and smooth slow mo.

https://www.youtube.com/watch?v=ebVQnMmMRVU

– Jon Barrie

Jon Barrie
aJBprods
http://www.jonbarrie.net
http://www.suiteskills.com

[Einar Bragi]

Well, I know about that feature, but than I would have to slow it down to 35 fps (0,7*50=35) which is not exactly a good frame rate to work with, especially since not all the video is taken at 130% speed.

Then I would have some of the video in a 50 fps sequence, and another at 35 fps. Is there any way to mix those two sequences together?

[Jon Barrie]

It all comes back to your output file properties for screening.

If its for TV broadcast in PAL land you will want to work in a 25fps seq.

There is currently no such format to playback 35fps outside of a computer file manually set to 35fps. Why are you wanting to work with such an outside standards frame rate?

130% of 25 fps is how the math should have been worked out before shooting. So 200% of 25fps = 50fps = 50% slow motion. So the song should have been 200% for clean sync in the edit for 25fps broadcast standard. 50fps in broadcast doesn’t really exist as far as I know and then you would be wanting to shoot higher fps speeds for slow motion in a 50fps playback so 200% fps to make 50% slow motion should be 100fps (not achievable with HDSLR cams – 60fps is the highest).

I am interested to know the method behind your approach.

35fps interpret would allow for a roughly 75% slow motion in a 25fps seq and should effectively work with clean frames not meshed blends while using speed/duration or timeremapping. If you duplicate clips you want to speed ramp toghether then you can have a slow version and a normal 50fps version for realtime playback in the 25fps timeline/output. Or you can just speed up the slow version when the edit requires it, but that is not as clean as using the clean frames of an interpret.

– Jon Barrie

Jon Barrie
aJBprods
http://www.jonbarrie.net
http://www.suiteskills.com

[Sylvia Porter]

From what I’m understanding, you don’t want every fifth frame to have no motion.

In motion, on Mac, from what I understand “Optical Flow Retiming” does what you are looking for.

[Einar Bragi]

Thanks for the replies, shooting the video at 50 fps and intepreting it to 25 was not an options since the song was way to fast for anybody to sing in sync at 200% speed.

I’ve found out that the best approach is to intepret the footage to 25 and speed it up 140%.

The only bug for me now is to keep the audio in sync with the video while editing, not a huge problem but if there’s a way to fix this it would be great.

It seems like this slow-motion effect is much easier if you’re in an NTSC land. By speeding the song up by 40.06% shoot it at 50 fps and intepret it to 29.97, unless you have a very slow song where you would be able to speed it up by 50%, but that was not an option in my case.

[Uvi Orogun]

Please I need help 🙂 am a bit lost too. My Cameraman suggested we shoot on 50fps and the track has been speeded up to 120%. How can I do the maths to get the sync? Thanks for your urgent help, thank you.

[Uvi Orogun]

What if in my case, the song was at a 120% unlike your which was at 130%? I am currently converting to 24p using Nattress converter 1.5 (They dont have option for 25fps). Once conversion is done, What should I speed my video by? in your case, you sped your to 140% based on the song being at the speed of 120%. Is there some sort of fomular that you used to work this out? or was it just a trial and error? in which case I have to wait for a render each trial…

Thanks a bunch

[Christoffer Hove]

Hi Jon
I love this tutorial, but I have a problem. I can’t drag and drop my ‘slow’file onto the new item icon – when ever I try nothing happen – do you have any ideer what I might be doing wrong?

[Jon Barrie]

That’s not expected… Which version of PPro are you using?

Jon Barrie
aJBprods
Jon’s YouTube Tutorial Page
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[Christoffer Hove]

CS3
I can work around it by just creating a new sekvens and drop the clip into it, but your method just seems a bit easier.