Weird preview artifacting at DVinfo.net

Ben Winter · July 26th, 2006, 11:52 PM

I'm getting weird artifacts when rendering HDV previews.

http://www.frozenphoenixproductions..../artifacts.JPG

anyone know what this is?

Pete Bauer · July 27th, 2006, 05:09 AM

Ben, first off-the-cuff guess is the video driver needs an update. But more info will help people help you diagnose the problem. What version of PPro are you using, are you capturing native or using Cineform, which camera using what frame rate, what project settings, and does the green stripe show up or not show up in the source monitor, and/or an exported frame or clip as well as in the program monitor? What effects are you applying...I assume the split screen look is due to a color correction effect that you applied?

BTW, your profile shows you using a GL2. Guess you've spent some money since your last profile update? ;-)

Ben Winter · July 27th, 2006, 01:50 PM

Pete,
I have the latest video drivers from Matrox, so far as I know. I am using a Matrox Parhelia APVe card.

I am using Premiere Pro 2.0, I captured this natively, using FX1 1080 60i, Adobe HDV 60i project preset. The artifacts show up when I render the effect (it is one layer, half opacity, over another layer with 29 Gaussian blur). The source footage looks fine.

Profile has been duly updated :)

Frank Hool · July 27th, 2006, 05:11 PM

Ben, try turn off hardware acceleration under troubleshooting tab in vga driver options. Does it change things?

Ben Winter · July 27th, 2006, 11:16 PM

Turned off acceleration, rerendered--no change.

Pete Bauer · July 28th, 2006, 06:14 AM

Try rendering a short sample each way, changing only one thing with each trial:
- reversing the layers (adjust their opacities as required, of course)
- with say, 20 and 50 on the Blur setting
- the Gaussian Blur unchanged, except toggled off
- replace the Gaussian Blur with a couple of different effects, one a different blur and the other anything else, such as a sharpening effect

What I'm after here is to isolate whether the artifact is coming from a bug in the Gaussian effect itself, the opacity effect, or the render engine. Kinda seems you're heading toward a bug report to Adobe, though.

July 26th, 2006, 11:52 PM	#1
Ben Winter Trustee Join Date: Jun 2005 Location: Hollywood, CA Posts: 1,675 Images: 1	Weird preview artifacting I'm getting weird artifacts when rendering HDV previews. http://www.frozenphoenixproductions..../artifacts.JPG anyone know what this is?

July 27th, 2006, 05:09 AM	#2
Pete Bauer Wrangler Join Date: May 2003 Location: Eagle River, AK Posts: 4,100	Ben, first off-the-cuff guess is the video driver needs an update. But more info will help people help you diagnose the problem. What version of PPro are you using, are you capturing native or using Cineform, which camera using what frame rate, what project settings, and does the green stripe show up or not show up in the source monitor, and/or an exported frame or clip as well as in the program monitor? What effects are you applying...I assume the split screen look is due to a color correction effect that you applied? BTW, your profile shows you using a GL2. Guess you've spent some money since your last profile update? ;-) __________________ Pete Bauer The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. Albert Einstein Trying to solve a DV mystery? You may find the answer behind the SEARCH function ... or be able to join a discussion already in progress!

July 27th, 2006, 01:50 PM	#3
Ben Winter Trustee Join Date: Jun 2005 Location: Hollywood, CA Posts: 1,675 Images: 1	Pete, I have the latest video drivers from Matrox, so far as I know. I am using a Matrox Parhelia APVe card. I am using Premiere Pro 2.0, I captured this natively, using FX1 1080 60i, Adobe HDV 60i project preset. The artifacts show up when I render the effect (it is one layer, half opacity, over another layer with 29 Gaussian blur). The source footage looks fine. Profile has been duly updated :) Last edited by Ben Winter; July 27th, 2006 at 02:23 PM.

July 28th, 2006, 06:14 AM	#6
Pete Bauer Wrangler Join Date: May 2003 Location: Eagle River, AK Posts: 4,100	Try rendering a short sample each way, changing only one thing with each trial: - reversing the layers (adjust their opacities as required, of course) - with say, 20 and 50 on the Blur setting - the Gaussian Blur unchanged, except toggled off - replace the Gaussian Blur with a couple of different effects, one a different blur and the other anything else, such as a sharpening effect What I'm after here is to isolate whether the artifact is coming from a bug in the Gaussian effect itself, the opacity effect, or the render engine. Kinda seems you're heading toward a bug report to Adobe, though. __________________ Pete Bauer The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. Albert Einstein Trying to solve a DV mystery? You may find the answer behind the SEARCH function ... or be able to join a discussion already in progress!

July 27th, 2006, 05:11 PM	#4
Frank Hool Major Player Join Date: Apr 2006 Location: Barca Spain Posts: 384	Ben, try turn off hardware acceleration under troubleshooting tab in vga driver options. Does it change things?

July 27th, 2006, 11:16 PM	#5
Ben Winter Trustee Join Date: Jun 2005 Location: Hollywood, CA Posts: 1,675 Images: 1	Turned off acceleration, rerendered--no change.