HD-SDI live capture - Experiences? Settings? at DVinfo.net

Go Back   DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.

Thread Tools Search this Thread
Old January 31st, 2010, 01:41 PM   #1
Regular Crew
Join Date: Nov 2006
Location: Lincoln, NE
Posts: 162
HD-SDI live capture - Experiences? Settings?

I've been experimenting with the HD-SDI output on my HD250 capturing directly via a Blackmagic card. I have to say, I'm a little disappointed.

I was expecting less noise than HDV footage. I need to do some more testing, but my first impression is that the SDI footage is just as noisy as the HDV, well maybe a little less but not much. That makes me think it's CCD noise or I may need a totally different scene file recipe for SDI capture. I'm using the same tweaked version of Paolo Ciccone's True Color for the 250 that I use when shooting HDV. Or is it that my coax is too long? I'm testing with 15ft of cable.

Is anyone else doing this? What's been your experience? Are you using a special scene file recipe?
Chad Haufschild is offline   Reply With Quote
Old February 1st, 2010, 06:28 AM   #2
Major Player
Join Date: Nov 2005
Location: Belgium
Posts: 695
If you would compare Analog Component with HDV recording/SDI output you would see less or more noise between them.
HDV and HD-SDI are both digital, so the actual noise level from the CCD should show pretty much the same as there are no analog conversions in between. The only big difference between the HDV and SDI is that SDI is uncompressed video signal.
From my feeling because the camera compresses the signal on tape or FireWire, some degree of noise is compacted in HDV (showing black artifacts instead though)
HD-SDI is digital, so the length of the cable will not add more video-noise. It is the best available output you can get from the camera.
Marc Colemont - Belgium - http://www.mc-productions.be
JVC GY-HM850's, HM890, HM600
Marc Colemont is offline   Reply With Quote
Old February 1st, 2010, 10:32 AM   #3
Regular Crew
Join Date: Nov 2006
Location: Lincoln, NE
Posts: 162
Thanks, Marc. I suppose my expectations were too high. It makes sense that the noise is CCD related. I was hoping the HDV compression was introducing more noise than it actually is.

The cable length was a grasp at straws to explain my disappointment. It didn't make sense that 15ft would introduce any issues. I've run 100ft of coax in other applications without a problem, but never from this camera.

Now I just need to decide if being tethered to a capture system for 10bit 4:2:2 with similar noise is worth the hassle. I'm shooting my second feature with this rig in April.

The first was shot to tape and transcoded to Cineform for post (included green screen composites and color grading) and I was quite pleased with the results after using Neat Video to clean up the noise.

I was hoping to eliminate a great portion of the Neat Video cleanup. It's time consuming. I can see a theoretical advantage to 10bit 4:2:2 transcoded to Cineform as compared to the 8bit 4:2:0 HDV transcoded. Theoretically I should have better information for the color grading and compositing processes, but is so much better that it's worth the hassle of a tethered camera?

That's what I need to test. I need to capture the same footage to tape and via HD SDI and process the crap out of it and see what happens.

Any thoughts or experiences would be greatly appreciated.
Chad Haufschild is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 03:14 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network