Best way to get slow motion for 1080/24P film? at DVinfo.net

Emre Safak · September 22nd, 2006, 02:11 PM

Do you think it would be better to capture 720p60 and adjust the resolution, or to get 1080i60 and interpolate the 24P frames? The first option is a lot simpler, but I am not sure which one would yield the best results.

Barry Green · September 22nd, 2006, 02:38 PM

The best way would be to shoot 1080/30p and adjust the frame rate of the clip. That'll give you full-resolution frame-accurate 1080 slow motion; it just won't be very slow is all.

Other than that, I haven't spent any time trying it but I'd guess you'd have more success with 720/60p rather than de-interlaced 1080/60i.

Mike Schrengohst · September 23rd, 2006, 06:32 AM

Try a test both ways. Also try shooting 720 24pN at 60 fps
and uprez that to 1080 24p....

Emre Safak · September 23rd, 2006, 11:29 AM

I doubt I will have the luxury to test this shot, so I wanted to bank on your experience.

Mike Schrengohst · September 23rd, 2006, 01:22 PM

Try testing ahead of time.....
Go outside and record some traffic or
a scene similiar to what you
will be recording....
I have been doing this 25 years
and I still test and experiment
all the time.

Rami Golan · February 16th, 2007, 06:45 AM

Quote:

Originally Posted by Barry Green

The best way would be to shoot 1080/30p and adjust the frame rate of the clip. That'll give you full-resolution frame-accurate 1080 slow motion; it just won't be very slow is all.

Other than that, I haven't spent any time trying it but I'd guess you'd have more success with 720/60p rather than de-interlaced 1080/60i.

Barry, sorry for the newbie question, how you can adjust the frame rate of the clip?

Andzei Matsukevits · February 19th, 2007, 09:09 AM

just do it in NLE but setting the speed of clip, i think he ment it this way...

Jason Boyce · February 20th, 2007, 03:05 PM

If you try to slow down too much in NLE (at least in FCP) you'll get ghosting as inbetween frames are "rendered." But maybe if you shoot 1080/60, you can then drop it in a 30fps timeline and get slowmo.

I've beend oing lots of slow-mo using 720p, 60fps/24p and it's come out beautifully, plus I can slow it down even more in post without worrying about the ghosting. I've gotten a 10 second shot up to a minute long without seeing the ghost renders, and that was with birds in flight. However, their wings move pretty fast, so if you don't need to catch such a fast moving object, you'll be fine doing it in post.

Robert Lane · February 20th, 2007, 04:18 PM

If you're on a Mac the best way is to use Shake to create your slow-motion effects. Unlike FCP which uses frame-blending which looks like staggered frames Shake instead uses "optical flow-based retiming" to create glass-smooth slo-mo. Check out the Shake demos on the Apple site and you'll see what I mean.

If you're on a PC I'm not sure which of the post-add ons would do the same thing as Shake.

Emre Safak · February 21st, 2007, 06:21 AM

After Effects 7 for one. Realviz retimer, or revisionfx twixtor (the people that started it all).

September 22nd, 2006, 02:11 PM	#1
Emre Safak Trustee Join Date: Feb 2004 Location: Brookline, MA Posts: 1,447	Best way to get slow motion for 1080/24P film? Do you think it would be better to capture 720p60 and adjust the resolution, or to get 1080i60 and interpolate the 24P frames? The first option is a lot simpler, but I am not sure which one would yield the best results.

September 23rd, 2006, 06:32 AM	#3
Mike Schrengohst Major Player Join Date: Apr 2006 Location: Dallas, TX Posts: 355	Try a test both ways. Also try shooting 720 24pN at 60 fps and uprez that to 1080 24p.... __________________ Mike Schrengohst dvd.pro@verizon.net

September 23rd, 2006, 01:22 PM	#5
Mike Schrengohst Major Player Join Date: Apr 2006 Location: Dallas, TX Posts: 355	Try testing ahead of time..... Go outside and record some traffic or a scene similiar to what you will be recording.... I have been doing this 25 years and I still test and experiment all the time. __________________ Mike Schrengohst dvd.pro@verizon.net

February 20th, 2007, 04:18 PM	#9
Robert Lane Go Go Godzilla Join Date: Nov 2004 Location: Scottsdale, AZ USA Posts: 2,825 Images: 15	Shake it up If you're on a Mac the best way is to use Shake to create your slow-motion effects. Unlike FCP which uses frame-blending which looks like staggered frames Shake instead uses "optical flow-based retiming" to create glass-smooth slo-mo. Check out the Shake demos on the Apple site and you'll see what I mean. If you're on a PC I'm not sure which of the post-add ons would do the same thing as Shake.

September 22nd, 2006, 02:38 PM	#2
Barry Green Barry Wan Kenobi Join Date: Jul 2003 Location: North Carolina Posts: 3,863	The best way would be to shoot 1080/30p and adjust the frame rate of the clip. That'll give you full-resolution frame-accurate 1080 slow motion; it just won't be very slow is all. Other than that, I haven't spent any time trying it but I'd guess you'd have more success with 720/60p rather than de-interlaced 1080/60i.

September 23rd, 2006, 11:29 AM	#4
Emre Safak Trustee Join Date: Feb 2004 Location: Brookline, MA Posts: 1,447	I doubt I will have the luxury to test this shot, so I wanted to bank on your experience.

February 19th, 2007, 09:09 AM	#7
Andzei Matsukevits Major Player Join Date: May 2005 Location: Tallinn, Estonia Posts: 300	just do it in NLE but setting the speed of clip, i think he ment it this way...

February 20th, 2007, 03:05 PM	#8
Jason Boyce Regular Crew Join Date: Apr 2006 Location: San Francisco, CA Posts: 77	If you try to slow down too much in NLE (at least in FCP) you'll get ghosting as inbetween frames are "rendered." But maybe if you shoot 1080/60, you can then drop it in a 30fps timeline and get slowmo. I've beend oing lots of slow-mo using 720p, 60fps/24p and it's come out beautifully, plus I can slow it down even more in post without worrying about the ghosting. I've gotten a 10 second shot up to a minute long without seeing the ghost renders, and that was with birds in flight. However, their wings move pretty fast, so if you don't need to catch such a fast moving object, you'll be fine doing it in post.

February 21st, 2007, 06:21 AM	#10
Emre Safak Trustee Join Date: Feb 2004 Location: Brookline, MA Posts: 1,447	After Effects 7 for one. Realviz retimer, or revisionfx twixtor (the people that started it all).