Using Cineform to go 24p (23.967p). at DVinfo.net

Desmond Sukotjo · December 14th, 2009, 09:49 PM

I was wondering what whould be the best way to output video framerate at 23.976p?
That is,
#1. Is it better to shoot at 29.97 interlace, and then converts to 23.976p using cinefrom.
#2. Is it better to shoot at 25fps interlace (50i), and then converts to 23.976p using cineform.

David Newman · December 14th, 2009, 10:20 PM

#2 wins no matter who's tools you use.

Desmond Sukotjo · December 14th, 2009, 11:00 PM

Even with that pulldown technique thing?

David Newman · December 15th, 2009, 12:27 AM

That only applies if you have pulldown, a 24p recording stored in 60i -- then that is best.

Desmond Sukotjo · December 15th, 2009, 04:59 AM

I thought if you recording at 24p on the camera, then during capture we use 24p (23.976p) preset then we end-up with a 24p footage already. Is this false?

Is this something that we can check if our footage has pulldown or not? Is there a way to do so?

In the case of recording video on 5Dmk2, which is 30p (not 29.97p), and we use HDLink to go to 23.976p, is the audio will be slowed down acoordingly? The audio pitch will be way off.

David Newman · December 15th, 2009, 09:42 AM

Your original question only asked about 60i and 50i sources. I assumed if your camera shot 24p you would have mentioned it. 24p sources stored in 60i have pulldown. Then absolutely you should use the pulldown removal to extract the true 24p (23.976) frames from within the 60i wrapper.

If you are shooting 30/29.97p you can add a 20% slowdown with audio pitch correction.

December 15th, 2009, 12:27 AM	#4
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	That only applies if you have pulldown, a 24p recording stored in 60i -- then that is best. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 15th, 2009, 09:42 AM	#6
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	Your original question only asked about 60i and 50i sources. I assumed if your camera shot 24p you would have mentioned it. 24p sources stored in 60i have pulldown. Then absolutely you should use the pulldown removal to extract the true 24p (23.976) frames from within the 60i wrapper. If you are shooting 30/29.97p you can add a 20% slowdown with audio pitch correction. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 14th, 2009, 09:49 PM	#1
Desmond Sukotjo Regular Crew Join Date: May 2004 Location: San Francisco, CA Posts: 88	Using Cineform to go 24p (23.967p). I was wondering what whould be the best way to output video framerate at 23.976p? That is, #1. Is it better to shoot at 29.97 interlace, and then converts to 23.976p using cinefrom. #2. Is it better to shoot at 25fps interlace (50i), and then converts to 23.976p using cineform.

December 14th, 2009, 10:20 PM	#2
David Newman CTO, CineForm Inc. Join Date: Jul 2003 Location: Cardiff-by-the-Sea, California Posts: 8,095	#2 wins no matter who's tools you use. __________________ David Newman -- web: www.gopro.com blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman

December 14th, 2009, 11:00 PM	#3
Desmond Sukotjo Regular Crew Join Date: May 2004 Location: San Francisco, CA Posts: 88	Even with that pulldown technique thing?

December 15th, 2009, 04:59 AM	#5
Desmond Sukotjo Regular Crew Join Date: May 2004 Location: San Francisco, CA Posts: 88	I thought if you recording at 24p on the camera, then during capture we use 24p (23.976p) preset then we end-up with a 24p footage already. Is this false? Is this something that we can check if our footage has pulldown or not? Is there a way to do so? In the case of recording video on 5Dmk2, which is 30p (not 29.97p), and we use HDLink to go to 23.976p, is the audio will be slowed down acoordingly? The audio pitch will be way off.