30fps to 24fps? at DVinfo.net

Corey Aucutt · March 26th, 2006, 09:10 PM

Hello all. I was curious to know if it is possible to shoot something in 30fps (XL1)
and then in post knock it down to 24fps?

I was told that was doable.

Raza Ahmad · March 26th, 2006, 10:09 PM

http://www.redgiantsoftware.com/magbulsuit.html

This is the only method of doing this that I know of... the problem is that with a 30 --> 24 conversion you are actually needing frames that exist between the frames of a 30fps stream, (as opposed to going to 15fps, 10, etc.) you are actually using every 1.25th frame, so magic bullet blends the in and out frames around the desired point in the video stream to create the needed image... its a loooooooong render.... good software though...

they used this product for vanilla sky...

-raza

Glenn Chan · March 26th, 2006, 11:42 PM

DVFilm
Nattress (nattress.com) for Final Cut Pro
Vegas (editing program)

are other products that do this. MBSuite is quite slow from what I've heard.

2- If you want the same effect. there are a variety of de-interlacers out there. I can't tell the difference between 30p and 24p. 24p has slight distribution advantages (better compression for DVD and streaming, translates into PAL easily whereas 30p origination doesn't).

Corey Aucutt · March 27th, 2006, 09:30 AM

awesome thanks.

David Jimerson · March 27th, 2006, 05:19 PM

It's physcially possible, but the results will probably not be great. Converting 60i to 24p is easier because there are so many more motion samples to choose from when making the conversion (60i has 2.5x the motion samples of 24p), but 30p has only six more motion samples per second, and it doesn't translate well. If you have more than just a tiny bit of motion, it will be very choppy and stroby (especially on pans), and the edges of moving objects will likely have a "ghosting" effect.

Just letting you know what you're in for.

David J. Payne · March 30th, 2006, 11:18 AM

is there anyway to do this using the built in effects in premiere pro 2.0 or do you have to use magic bullet? Is there any way to set up a 25fps timelime in prem pro also? as this would give a relatively close feel to the 24fps conversion that magic bullet offers.
thanks

Joshua Provost · March 30th, 2006, 11:59 AM

Corey,

When you say 30fps, are you referring to normal interlaced 60i footage, or progressive 30p footage (with the Canon FRAME mode)? 60i will convert well to 24p using a variety of methods. 30p doesn't convert so well.

MB doesn't blend, it interpolates. Each product uses a different method. Maker is a combination of selective field doubling and frame blending.

Josh

Corey Aucutt · April 2nd, 2006, 04:35 PM

im talking about frame mode in the xl1.

Joshua Provost · April 2nd, 2006, 10:47 PM

Corey,

Ah, FRAME mode. Well, if you want to maintain the speed of the clip, it won't convert to 24p very well. All of the manuals and help files for the conversion software will say as much. Don't shoot FRAME mode.

However, if you want to do a slight slow-motion effect, you can just interpret your 30p as 24p, and each second will become a second and a third. Audio won't match, of course.

If you want to convert to 24p in the future, shoot 60i.

Josh

March 26th, 2006, 09:10 PM	#1
Corey Aucutt New Boot Join Date: Dec 2005 Location: Baton Rouge, LA Posts: 14	30fps to 24fps? Hello all. I was curious to know if it is possible to shoot something in 30fps (XL1) and then in post knock it down to 24fps? I was told that was doable.

March 26th, 2006, 10:09 PM	#2
Raza Ahmad Regular Crew Join Date: Aug 2004 Location: los angeles, ca Posts: 61	magic bullet http://www.redgiantsoftware.com/magbulsuit.html This is the only method of doing this that I know of... the problem is that with a 30 --> 24 conversion you are actually needing frames that exist between the frames of a 30fps stream, (as opposed to going to 15fps, 10, etc.) you are actually using every 1.25th frame, so magic bullet blends the in and out frames around the desired point in the video stream to create the needed image... its a loooooooong render.... good software though... they used this product for vanilla sky... -raza

March 27th, 2006, 05:19 PM	#5
David Jimerson Jubal 28 Join Date: Mar 2005 Location: Wilmington, NC Posts: 872	It's physcially possible, but the results will probably not be great. Converting 60i to 24p is easier because there are so many more motion samples to choose from when making the conversion (60i has 2.5x the motion samples of 24p), but 30p has only six more motion samples per second, and it doesn't translate well. If you have more than just a tiny bit of motion, it will be very choppy and stroby (especially on pans), and the edges of moving objects will likely have a "ghosting" effect. Just letting you know what you're in for. __________________ www.wrightsvillebeachstudios.com

March 30th, 2006, 11:59 AM	#7
Joshua Provost Major Player Join Date: Sep 2004 Location: Phoenix, AZ Posts: 493	Corey, When you say 30fps, are you referring to normal interlaced 60i footage, or progressive 30p footage (with the Canon FRAME mode)? 60i will convert well to 24p using a variety of methods. 30p doesn't convert so well. MB doesn't blend, it interpolates. Each product uses a different method. Maker is a combination of selective field doubling and frame blending. Josh __________________ Owner/Operator, 727 Records Co-Founder, Matter of Chance Productions Blogger, Try Avoidance

April 2nd, 2006, 10:47 PM	#9
Joshua Provost Major Player Join Date: Sep 2004 Location: Phoenix, AZ Posts: 493	Corey, Ah, FRAME mode. Well, if you want to maintain the speed of the clip, it won't convert to 24p very well. All of the manuals and help files for the conversion software will say as much. Don't shoot FRAME mode. However, if you want to do a slight slow-motion effect, you can just interpret your 30p as 24p, and each second will become a second and a third. Audio won't match, of course. If you want to convert to 24p in the future, shoot 60i. Josh __________________ Owner/Operator, 727 Records Co-Founder, Matter of Chance Productions Blogger, Try Avoidance

March 26th, 2006, 11:42 PM	#3
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	DVFilm Nattress (nattress.com) for Final Cut Pro Vegas (editing program) are other products that do this. MBSuite is quite slow from what I've heard. 2- If you want the same effect. there are a variety of de-interlacers out there. I can't tell the difference between 30p and 24p. 24p has slight distribution advantages (better compression for DVD and streaming, translates into PAL easily whereas 30p origination doesn't).

March 27th, 2006, 09:30 AM	#4
Corey Aucutt New Boot Join Date: Dec 2005 Location: Baton Rouge, LA Posts: 14	awesome thanks.

March 30th, 2006, 11:18 AM	#6
David J. Payne Major Player Join Date: Oct 2005 Location: Southend-On-Sea, England Posts: 368	is there anyway to do this using the built in effects in premiere pro 2.0 or do you have to use magic bullet? Is there any way to set up a 25fps timelime in prem pro also? as this would give a relatively close feel to the 24fps conversion that magic bullet offers. thanks

April 2nd, 2006, 04:35 PM	#8
Corey Aucutt New Boot Join Date: Dec 2005 Location: Baton Rouge, LA Posts: 14	im talking about frame mode in the xl1.