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Frame Rate - Motion Blur Reduction


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#1 Mike Berger

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Posted 08 May 2005 - 11:15 PM

Hi folks,

Your advice is needed. We're shooting a promo that involves a fast paced tap dance number. Our client is describing the desired look of an Old Navy commercial. I've seen this style of blur-less motion in many music videos and feature films that have fast action like an intense sporting event. I think I even recall seeing this motion style used in "Gladiator" during the intense battle/fight scenes.

Is this motion effect achieved by controlling my shutter speed? I am shooting on a Sony DSR-570 16:9 DVCam using a 19x Canon Lens with appropriate Tiffen 4x4 filters.

I plan to convert our 60i footage to 30p in post using Magic Bullet.

How can I create this motion effect that seems so popular for intense fast paced scenes?

Thanks for any help you can offer!
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#2 Phil Rhodes

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Posted 09 May 2005 - 04:27 AM

Hi,

Yes, you can emulate the effect by increasing shutter speed. Don't go too nuts, or you can start giving yourself other problems - 1/250 should be fine, roughly the equivalent of a 45-degree shutter on a film camera at the same frame rate (so marginally more staccato than a 45-degree shutter at 24fps).

Very staccato movement like this with little motion blur between fields is challenging for the deinterlacer. There are smart ones out there that will deal better with it than others; I don't know how good Magic Bullet is in this regard.

Phil

Edited by Phil Rhodes, 09 May 2005 - 04:28 AM.

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#3 drew_town

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Posted 09 May 2005 - 11:45 AM

The effect is also amplified or more apparent in closeup.
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#4 Mike Berger

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Posted 11 May 2005 - 09:42 PM

Thanks for the input guys...

Do you think that this motion effect could be a digital strobing effect or do you think think they are creating the effect in-camera by controlling the shutter speed?

I just saw the same style used on a few music videos today.

How do you think the pros are creating this motion effect?

Thanks!

Edited by Mike Berger, 11 May 2005 - 09:43 PM.

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#5 Phil Rhodes

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Posted 12 May 2005 - 03:26 AM

Hi,

They're doing it by decreasing the period the shutter is open, as I described above. It's the same principle on film or video.

Phil
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#6 David Mullen ASC

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Posted 12 May 2005 - 09:22 AM

And one of the advantages of video is that you can try out different shutter speeds and see the effect right there on set on the monitor.
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#7 Joshua Provost

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Posted 12 May 2005 - 05:23 PM

Mike,

It's all in the shutter speed, in camera. This will still look pretty good, as long as you deinterlace to 30p. If you want to go to 24p, it won't look so good, and Magic Bullet manuals tell you to shoot 1/60 (default shutter speed) when going to 24p.

If you want to go to 24p and still have the fast shutter speed: Shoot at 1/250 shutter. Deinterlace to 30p. Interpret the 30p output as 24p during editing. It will be a slight slow motion (1 sec slows to 1.3 seconds), but it will have the sharp shutter effect and by very smooth.

Josh
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#8 Mike Berger

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Posted 13 May 2005 - 06:48 PM

Thanks guys for taking the time to give such helpful advice.

It is greatly appreciated.

Thanks!
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