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Michael Ruiz
jitters when monitoring
on May 29, 2012 at 6:17:54 am

Hello All

I have a project that is Canon 5D Mark III footage converted to 23.98 ProRes. When editing or grading I see a heavy Judder in pans when monitoring out of Black Magic DeckLink Extereme to a calibrated monitor. This is in FCP and Resolve. I understand that there are limitations to a DSLR / panning issues with a 23.98 frame rate and this is not a rolling shutter issue. I have all my sequences set to ProRes 23.98 and the DeckLink is behaving properly. I triple checked footage to see if it was captured and converted properly. I'm just not sure about the monitoring issue. When I monitor I see a substantial judder in fast pan movements but when I compress to a VIMEO compression and view on my laptop the judder decreases substantially.


I need some advice on whats happening technically.

Thanks Everyone !

m i c h a e l



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Juan Salvo
Re: jitters when monitoring
on May 29, 2012 at 6:26:18 am

What monitor are you using? Can you feed it a P instead of PsF signal?

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Michael Ruiz
Re: jitters when monitoring
on May 29, 2012 at 6:30:58 am

Thanks Juan

Im on a JVC DT-V24L coming in SDI. Is this a normal issue when monitoring? I think I could feed it a P. Not sure how I would set that up but it shouldn't be an issue.



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Margus Voll
Re: jitters when monitoring
on May 29, 2012 at 6:38:38 am

just test it out. in config page see that your resolution number for timeline has P with it as progressive.

dslr material should be handled as progressive as it was shot.

look if it helps.

--

Margus

http://iconstudios.eu

DaVinci 8.2.1 OSX 10.7.3
MacPro 5.1 2x2,93 24GB
GTX 470 / Quadro 4000
Multibridge 2 Pro


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Michael Ruiz
Re: jitters when monitoring
on May 29, 2012 at 6:51:13 am

Hey Margus

I'm looking at the Config Tab and I see:

Timeline Format

1920 x 1080
Pixel: Square
PlayBack Frame Rate: 24 --- should I change to 23.976?

Image Processing: 32 bit

My Deck Capture / PlayBack is HD 1080psf 23.98

Thanks



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Margus Voll
Re: jitters when monitoring
on May 29, 2012 at 8:46:10 am

Have you tested 2:3 pull also ?

I do not work myself in 23 fp but just trying to think with you on that.

It seems to me like config problem.

--

Margus

http://iconstudios.eu

DaVinci 8.2.1 OSX 10.7.3
MacPro 5.1 2x2,93 24GB
GTX 470 / Quadro 4000
Multibridge 2 Pro


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Sascha Haber
Re: jitters when monitoring
on May 29, 2012 at 10:41:12 am

You guys think this is a technical problem ?
I think its a footage "feature"
Rolling shutter means almost no motion blur.
Can we see two chronological frames of the footage ?
My money is on that...And ReelSmart Mblur can help a lot in those cases.

A slice of color...

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Michael Ruiz
Re: jitters when monitoring
on May 29, 2012 at 4:28:34 pm

Hey Sascha

Yea ... It's a footage issue. check these 2 sequential shots from a pan down.

image_01.jpg

image_02.jpg



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Sascha Haber
Re: jitters when monitoring
on May 29, 2012 at 9:32:31 pm

That actually looks reeeally weird.
Like someone shot in 50i and converted to 25p.
The second image looks like two fields merged together.
Also you are looking at horizontal contrast stripes...worst case scenario :)
But first I would see if you can interpret that footage differently.
is this the source, or some FCP output (which i dont trust more than JPMorgan)

A slice of color...

DaVinci 8.2.1 OSX 10.7.2
MacPro 5.1 2x2,4 24GB
RAID0 8TB
GTX 470 / Quadro 4000
Extreme 3D+

ICA Instructor
http://www.icolorist.com/Sascha.html


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Michael Griggs
Re: jitters when monitoring
on May 29, 2012 at 2:16:19 pm

[Michael Ruiz] "My Deck Capture / PlayBack is HD 1080psf 23.98"


Check out this explanation of the difference between PsF and Progressive:

http://forums.creativecow.net/thread/132/860992#861016


At the least, it should help you understand what you're looking at.....even if it doesn't tell you how to "fix" it :-)


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Michael Ruiz
Re: jitters when monitoring
on May 29, 2012 at 4:29:18 pm

Thanks Michael

I'll read it shortly when I get a render going :)

Thanks !!



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