slowmo and jitter at DVinfo.net

Sassi Haham · June 12th, 2007, 08:59 AM

Hi, I tried this slomo technique http://rarevision.com/articles/slow_motion.php
it worked very well but I got flickering.
Should I do anything in the process to eliminate this flickering?
Thanks
Sassi
You can see a sample here http://stage6.divx.com/user/sasi_yaa...ONEY-BUZZARD-2
the clip shows migrating raptors.
that is a 17MB file on stage6 so you will need a Divx codec (available for download there).

Alan James · June 12th, 2007, 07:55 PM

The jitter on the top and bottom is something that can happen. Depending on what program you use there are ways to eliminate it. I do my slow mo renders in after effects and it has a simple check box to interpolate lines and fix the problem. If you wanna do it low tech just scale it up a bit. Like 2% bigger. Shouldn't be an issue.

Have fun

Sassi Haham · June 12th, 2007, 10:30 PM

Quote:

Originally Posted by Alan James

I do my slow mo renders in after effects and it has a simple check box to interpolate lines and fix the problem.

Thanks Alan, where in the process I find this check box ?

Alan James · June 12th, 2007, 11:17 PM

Here is a really good explanation I have written up before about the subject.

http://www.dvinfo.net/conf/showthrea...hlight=slow+mo

If your using After Effects 7 it should be pretty easy to follow.

Have fun

Sassi Haham · June 13th, 2007, 01:11 AM

Thanks again,
This is exactly what I (think) have done.
Does the "preserve edges" check box eliminate the flicker?
Sassi

Alan James · June 13th, 2007, 06:55 AM

Yeah, its suppose to. It interpolates scan lines. Should clear it up. I have found that at time I still get a little jitter though, but not nearly as much as you had in ur comp. So if you still see jitter another solution is to apply a 2 pixel vertical directional blur to your comp. You will loose some detail, but the detail is what is causing the jitter. Unfortunately using this method there are always trade offs.

June 12th, 2007, 08:59 AM	#1
Sassi Haham Regular Crew Join Date: Mar 2006 Location: Yaad, Galilee Posts: 117	slowmo and jitter Hi, I tried this slomo technique http://rarevision.com/articles/slow_motion.php it worked very well but I got flickering. Should I do anything in the process to eliminate this flickering? Thanks Sassi You can see a sample here http://stage6.divx.com/user/sasi_yaa...ONEY-BUZZARD-2 the clip shows migrating raptors. that is a 17MB file on stage6 so you will need a Divx codec (available for download there).

June 12th, 2007, 07:55 PM	#2
Alan James Regular Crew Join Date: Jul 2006 Location: Tampa, Florida Posts: 261	The jitter on the top and bottom is something that can happen. Depending on what program you use there are ways to eliminate it. I do my slow mo renders in after effects and it has a simple check box to interpolate lines and fix the problem. If you wanna do it low tech just scale it up a bit. Like 2% bigger. Shouldn't be an issue. Have fun

June 12th, 2007, 11:17 PM	#4
Alan James Regular Crew Join Date: Jul 2006 Location: Tampa, Florida Posts: 261	Here is a really good explanation I have written up before about the subject. http://www.dvinfo.net/conf/showthrea...hlight=slow+mo If your using After Effects 7 it should be pretty easy to follow. Have fun

June 13th, 2007, 01:11 AM	#5
Sassi Haham Regular Crew Join Date: Mar 2006 Location: Yaad, Galilee Posts: 117	Thanks again, This is exactly what I (think) have done. Does the "preserve edges" check box eliminate the flicker? Sassi

June 13th, 2007, 06:55 AM	#6
Alan James Regular Crew Join Date: Jul 2006 Location: Tampa, Florida Posts: 261	Yeah, its suppose to. It interpolates scan lines. Should clear it up. I have found that at time I still get a little jitter though, but not nearly as much as you had in ur comp. So if you still see jitter another solution is to apply a 2 pixel vertical directional blur to your comp. You will loose some detail, but the detail is what is causing the jitter. Unfortunately using this method there are always trade offs.