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greenscreen - SxS or HDSDI ingest for FCP?

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Sam Cole
greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 4:19:08 am

We have a greenscreen shoot next week and was wondering if ingesting directly out of the camera from the SxS cards as 10bit uncompressed via the HDSDI would give a better greenscreen key than using the conventional XDCAM workflow built into Final Cut Pro?

We use 'CHV Key Pro' mainly but also use After Effects occasionally. We have had good results with both but would like as much control as we can get.


Sam Cole
On line Mastering Facility
FCP, Avid, Adobe
Sydney, Australia


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Rafael Amador
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 5:13:46 am

Hi Sam,
Out of the compression (1.500 mbps vs 35mbps), the SDI out is 4.2.2 while the SxS records 4.2.0. Double number of color samples. Any chroma based effect should works much better.
rafael


http://www.nagavideo.com


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Sam Cole
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 5:41:53 am

Ok so from what I understand playing back off an SxS card has no advantage where as ingesting directly off the camera via HDSDI while shooting will be a definite advantage.

thanks

Sam Cole
On line Mastering Facility
FCP, Avid, Adobe
Sydney, Australia


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Rafael Amador
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 11:40:02 am

Right.
rafael

http://www.nagavideo.com


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Dean Sensui
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 12:06:19 pm

Here's a sample of something that was shot with an SxS card. Composited in After Effects using Primatte.

If you can get HDSDI out at 4:2:2 then that would be better. But it's pretty good with 4:2:0 sampling.

http://hawaiigoesfishing.com/greenscreen_demo.html

It hold hair flying in the breeze, translucent plastics, etc.

Dean Sensui -- Hawaii Goes Fishing


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Rafael Amador
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 26, 2010 at 1:30:50 pm

Really good.
rafael

http://www.nagavideo.com


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William Urschel
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 27, 2010 at 10:53:21 am

Rafael:

Yes, yes, 4:2:2 Rocks! Instead of the insanely high data rate with SDI out totally uncompressed, please consider using something that compresses in 4:2:2 at around 100Mbps, which you won't, for the most part, be able to tell from straight out totally uncompressed. Try the nanoFlash by Convergent Designs - set to 100 Mbps long GOP - I just wouldn't be without it, not only for green screen, but for its superior production without misquito noise and particularly other artifacts in high motion shots! See Convergent designs site http://www.convergent-design.com/ for a list of editors which will handle their files. By the way, I am not in any way affiliated with CD, I'm just an overboard admirer of the EX1 and the nanoFlash!


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Rafael Amador
Re: greenscreen - SxS or HDSDI ingest for FCP?
on Jun 27, 2010 at 11:37:05 am

Hi William,
I bought my Nano-flash even before CD released it.
Its really rocks.
rafael

http://www.nagavideo.com


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