HD to SD produces Artifacts and Jaggies at DVinfo.net

Tom Blizzard · July 29th, 2010, 05:16 PM

I'd sure appreciate some help and suggestion(s)

I'm trying to downconvert HD video taken from my Canon HV 40 to SD in order to mix it with video from my GL2 cams. Problem is that when I downconvert the HD, it has lots of minor "flashing" in the background and very noticeable jaggies wherever there are high constrasting objects in the frame.

How can I smooth this out? I've tried downconverting to .avi, .wmv, and other formats. However "DVD" mpg2 looked best, but when burned to a DVD it still has very noticeable picture defects.

Eugene J. Kulak · July 29th, 2010, 05:48 PM

What program are you using?

Tom Blizzard · July 29th, 2010, 06:00 PM

For downconverting or editing?

1, I downconverted with four different programs to get the best pic quality.
First, I tried: Prism Video Converter. -looked pretty good
Scond, I tried another........... freeware program - didn't look as good as the first.
Third, I tried one called Any Video Converter. - this looked best - I thought........
I also tried Handbrake which I use for Viemo but it seemed to be for converting to MP4
and my editing software would not take that format.

2. I'm editing on Adobe Premiere Eements

Tom Blizzard · July 29th, 2010, 06:48 PM

Found this.. thanks for being patient...http://www.dvinfo.net/forum/what-hap...d-quality.html

Eugene J. Kulak · July 30th, 2010, 06:50 AM

Hi Tom. I personally use a system built around a Matrox RT.X2 and for software I use Adobe CS4. With the Matrox system I am provided with a downscaling alternative that works very well. That being said, you are in a different situation. I have heard that many are getting good results using Cineform software. Also this link, http://www.dvinfo.net/forum/adobe-cr...m-quality.html is to another thread that is dealing with using maximum render quality in AME to achieve acceptable results. I am not too familiar with the elements version so I don't know if these options are available to you, but check out the thread as it may help.

Tom Blizzard · July 30th, 2010, 08:03 AM

Gene,
Thanks so much for the info and links. I will check them out. I just got a new PC with quad core and I have had CS4 for a while. Now I can use Premiere Pro.

Interesting, I have a niece in the wedding videography business in Nashville and she uses the Matrox card. I will have to learn about it.
Regards, Tom

Eugene J. Kulak · July 30th, 2010, 10:19 AM

Just be careful if considering Matrox. Make sure your system components meet their requirements.

Ron Evans · July 31st, 2010, 07:51 AM

I think you will find TMPGenc to give the best results of all the downconverters/encoders.

TMPGEnc - Products: TMPGEnc 4.0 XPress - Product Overview

Ron Evans

Tom Blizzard · July 31st, 2010, 10:36 AM

Thanks Ron........ downloading it now..... Free trial too. I'll give it a try.

Alister Chapman · August 1st, 2010, 03:31 AM

The problem is caused by having too much resolution in the HD image that leads to aliasing when down converted to SD without some kind of anti-aliasing pre filtering. The simplest way to do this is to add a very slight blur to the HD footage via a filter prior to down converting. A 3 pixel blur would work very well. I have some examples of this here: XDCAM-USER.com Getting SD from HD and the problems of oversampling.

Tom Blizzard · August 12th, 2010, 08:32 PM

Quote:

Originally Posted by Ron Evans

I think you will find TMPGenc to give the best results of all the downconverters/encoders.

TMPGEnc - Products: TMPGEnc 4.0 XPress - Product Overview

Ron Evans

SOLD !!! Amazing. Thanks Ron..... I've never seen SD look so good......

July 29th, 2010, 05:16 PM	#1
Tom Blizzard Regular Crew Join Date: Jun 2007 Location: West Rosemary Beach, Florida Posts: 199	HD to SD produces Artifacts and Jaggies I'd sure appreciate some help and suggestion(s) I'm trying to downconvert HD video taken from my Canon HV 40 to SD in order to mix it with video from my GL2 cams. Problem is that when I downconvert the HD, it has lots of minor "flashing" in the background and very noticeable jaggies wherever there are high constrasting objects in the frame. How can I smooth this out? I've tried downconverting to .avi, .wmv, and other formats. However "DVD" mpg2 looked best, but when burned to a DVD it still has very noticeable picture defects.

July 29th, 2010, 05:48 PM	#2
Eugene J. Kulak Regular Crew Join Date: Feb 2004 Location: New Britain, CT Posts: 95	What program are you using? __________________ Gene, Black Hole Video

July 30th, 2010, 06:50 AM	#5
Eugene J. Kulak Regular Crew Join Date: Feb 2004 Location: New Britain, CT Posts: 95	Hi Tom. I personally use a system built around a Matrox RT.X2 and for software I use Adobe CS4. With the Matrox system I am provided with a downscaling alternative that works very well. That being said, you are in a different situation. I have heard that many are getting good results using Cineform software. Also this link, http://www.dvinfo.net/forum/adobe-cr...m-quality.html is to another thread that is dealing with using maximum render quality in AME to achieve acceptable results. I am not too familiar with the elements version so I don't know if these options are available to you, but check out the thread as it may help. __________________ Gene, Black Hole Video

July 30th, 2010, 10:19 AM	#7
Eugene J. Kulak Regular Crew Join Date: Feb 2004 Location: New Britain, CT Posts: 95	Just be careful if considering Matrox. Make sure your system components meet their requirements. __________________ Gene, Black Hole Video

August 1st, 2010, 03:31 AM	#10
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	The problem is caused by having too much resolution in the HD image that leads to aliasing when down converted to SD without some kind of anti-aliasing pre filtering. The simplest way to do this is to add a very slight blur to the HD footage via a filter prior to down converting. A 3 pixel blur would work very well. I have some examples of this here: XDCAM-USER.com Getting SD from HD and the problems of oversampling. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

July 29th, 2010, 06:00 PM	#3
Tom Blizzard Regular Crew Join Date: Jun 2007 Location: West Rosemary Beach, Florida Posts: 199	For downconverting or editing? 1, I downconverted with four different programs to get the best pic quality. First, I tried: Prism Video Converter. -looked pretty good Scond, I tried another........... freeware program - didn't look as good as the first. Third, I tried one called Any Video Converter. - this looked best - I thought........ I also tried Handbrake which I use for Viemo but it seemed to be for converting to MP4 and my editing software would not take that format. 2. I'm editing on Adobe Premiere Eements

July 29th, 2010, 06:48 PM	#4
Tom Blizzard Regular Crew Join Date: Jun 2007 Location: West Rosemary Beach, Florida Posts: 199	Found this.. thanks for being patient...http://www.dvinfo.net/forum/what-hap...d-quality.html

July 30th, 2010, 08:03 AM	#6
Tom Blizzard Regular Crew Join Date: Jun 2007 Location: West Rosemary Beach, Florida Posts: 199	Gene, Thanks so much for the info and links. I will check them out. I just got a new PC with quad core and I have had CS4 for a while. Now I can use Premiere Pro. Interesting, I have a niece in the wedding videography business in Nashville and she uses the Matrox card. I will have to learn about it. Regards, Tom

July 31st, 2010, 07:51 AM	#8
Ron Evans Inner Circle Join Date: Mar 2003 Location: Ottawa, Ontario, Canada Posts: 4,220	I think you will find TMPGenc to give the best results of all the downconverters/encoders. TMPGEnc - Products: TMPGEnc 4.0 XPress - Product Overview Ron Evans

July 31st, 2010, 10:36 AM	#9
Tom Blizzard Regular Crew Join Date: Jun 2007 Location: West Rosemary Beach, Florida Posts: 199	Thanks Ron........ downloading it now..... Free trial too. I'll give it a try.