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Old March 2nd, 2009, 09:54 AM   #1
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Best practice for slo mo?

Hi there,

Until recently I thought that filming slo mo was just a case of overcranking to 60 frames in 720 50p. However I noticed (on another forum!) that it has been suggested shooting in 720 25p and using the S&Q motion at 60 frames produces better results plus gives you the benefit of seeing the results in camera.

I was wondering how you guys (wiser than myself) are doing it? Which method is best with regards to workflow and mixing slo mo in with normal footage.

Many thanks!
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Old March 2nd, 2009, 11:42 AM   #2
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I always shoot 60fps in 25P outdoor and 50fps 25P indoor.
The reason is that in Europe the electric frequency is 50hz as opposed to the states that have 60hz.
If I shoot 60fps under artificial lighting the image will pulsate as itīs out of sync with the frequency.

I always presumed that if you shoot 60fps in 50P you only slow down the motion 10% or so?
I mean 50fps in 50P is normal speed right?
You need to shoot 25P to get a proper slo-mo effect.
When we shoot actionsport we normally shoot 720 50P to get as smooth sction as possible and when ever we want slo-mo
we switch the camera to 720 25P and crank it to 60fps.

We drop it all into the same timeline and it inter cuts very well.
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Old March 2nd, 2009, 11:53 AM   #3
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Joachim,

Many thanks!

Yeah, it would seem that 10 percent is a good argument! Plus I love seeing the action in cam after.

I use Final Cut Pro and it occurred to me that unless you are dropping your slo mo footage in to a 60fps timeline are you going to get the best from it? If your first clip is shot at 50fps then you drop in a 60fps clip then will the slo mo be affected because it is in the wrong kind of sequence setting?

Interesting stuff!
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Old March 2nd, 2009, 12:17 PM   #4
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On a different tack, you may want to look at Alex Gollner's Compressor tests for making slomo - especially interesting if you're not working with interlaced footage:

Final Cut slow motion at various speeds on Vimeo

BTW, Alex also has some free plugins for FCP that do really useful stuff (I couldn't do without alex4d-vignette) - Free FCP Plug-ins
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