Pulldown in HD at DVinfo.net

Brian Critchlow · August 31st, 2006, 07:20 PM

Hey folks,

We're trying to shoot 1080p24 through SDI to a Blackmagic Multibridge pro, and I noticed in the manual about the different pulldown settings. This is important, as the camera actually outputs 60i in 1080p, but the real 24p footage is pulled down to 60i.

The manual indicates that the various modes are only available for SD. What pulldown mode does the XL-H1 use for 1080p24? This is crucial for recovering the original progressive frames in Final Cut / Cinema Tools.

Thanks in advance,

-Brian Critchlow

P.S. Is there a way to have the manual focus distance always displayed instead of just popping up when you are racking focus?

Michael Galvan · August 31st, 2006, 08:44 PM

The H1 applies a standard 3:2 pulldown to conform 24F footage to 60i through the HD-SDI spigot.

Brian Critchlow · September 2nd, 2006, 12:52 AM

Thanks Michael.
We brought the footage into after effects 7 and used its magic little tools to deal with the pulldown.

Brad Schreiber · September 2nd, 2006, 11:00 AM

I imported my footage through Aspect HD (via Firewire) and that removed the pulldown as well. From there you can convert it into Quicktimes in MPEG Streamclip.

Lee Alford · September 3rd, 2006, 08:39 AM

brad, i thought i read somewhere that there is no pulldown in the firewire. just 24 progressive frames.

Nate Weaver · September 3rd, 2006, 10:35 AM

The trick used to put 24p in an MPEG stream could either be described as "pulldown"...or not. Depends how you look at it. That's why there'a so much confusion on the matter.

Also, depending on how the MPEG decoder works in the conversion stage to Aspect, there may or may not be pulldown to remove. The Aspect MPEG decoder could decide to convert to native 24p, or could heed the repeat flags in the stream and add extra fields.

Brad Schreiber · September 3rd, 2006, 02:00 PM

I had the resulting Quicktime's metered for speed, and they rate at 23.98. Whether it was the Aspect HD, or MPEG STreamclip, the process worked. Also, I shot 24F mode, not 60i.

Brian Critchlow · September 3rd, 2006, 03:45 PM

We are shooting 24f, but as per the manual, the camera automatically does a 3:2 pulldown and the signal is 60i (59.94) coming into the machine, which then has to be reversed to restore the 24f, as we are doing in after effects.

John Benton · September 3rd, 2006, 10:50 PM

It just BAFFLES me that FCP doesnt do 24f yet.

J

August 31st, 2006, 07:20 PM	#1
Brian Critchlow Regular Crew Join Date: Dec 2005 Location: Santa Cruz, CA Posts: 133	Pulldown in HD Hey folks, We're trying to shoot 1080p24 through SDI to a Blackmagic Multibridge pro, and I noticed in the manual about the different pulldown settings. This is important, as the camera actually outputs 60i in 1080p, but the real 24p footage is pulled down to 60i. The manual indicates that the various modes are only available for SD. What pulldown mode does the XL-H1 use for 1080p24? This is crucial for recovering the original progressive frames in Final Cut / Cinema Tools. Thanks in advance, -Brian Critchlow P.S. Is there a way to have the manual focus distance always displayed instead of just popping up when you are racking focus?

August 31st, 2006, 08:44 PM	#2
Michael Galvan Major Player Join Date: Sep 2004 Location: New York, NY Posts: 775	The H1 applies a standard 3:2 pulldown to conform 24F footage to 60i through the HD-SDI spigot. __________________ www.michaelgalvan.com www.screenanthology.com

September 2nd, 2006, 11:00 AM	#4
Brad Schreiber Regular Crew Join Date: Feb 2006 Location: Los Angeles, CA Posts: 96	Other Pulldown Methods I imported my footage through Aspect HD (via Firewire) and that removed the pulldown as well. From there you can convert it into Quicktimes in MPEG Streamclip.

September 3rd, 2006, 10:35 AM	#6
Nate Weaver Wrangler Join Date: Oct 2002 Location: Los Angeles, CA Posts: 2,100	The trick used to put 24p in an MPEG stream could either be described as "pulldown"...or not. Depends how you look at it. That's why there'a so much confusion on the matter. Also, depending on how the MPEG decoder works in the conversion stage to Aspect, there may or may not be pulldown to remove. The Aspect MPEG decoder could decide to convert to native 24p, or could heed the repeat flags in the stream and add extra fields. __________________ My Work: nateweaver.net

September 3rd, 2006, 02:00 PM	#7
Brad Schreiber Regular Crew Join Date: Feb 2006 Location: Los Angeles, CA Posts: 96	Aspect or MPEG I had the resulting Quicktime's metered for speed, and they rate at 23.98. Whether it was the Aspect HD, or MPEG STreamclip, the process worked. Also, I shot 24F mode, not 60i.

September 2nd, 2006, 12:52 AM	#3
Brian Critchlow Regular Crew Join Date: Dec 2005 Location: Santa Cruz, CA Posts: 133	Thanks Michael. We brought the footage into after effects 7 and used its magic little tools to deal with the pulldown.

September 3rd, 2006, 08:39 AM	#5
Lee Alford Regular Crew Join Date: Jul 2006 Location: Los Angeles, CA. Posts: 29	brad, i thought i read somewhere that there is no pulldown in the firewire. just 24 progressive frames.

September 3rd, 2006, 03:45 PM	#8
Brian Critchlow Regular Crew Join Date: Dec 2005 Location: Santa Cruz, CA Posts: 133	We are shooting 24f, but as per the manual, the camera automatically does a 3:2 pulldown and the signal is 60i (59.94) coming into the machine, which then has to be reversed to restore the 24f, as we are doing in after effects.

September 3rd, 2006, 10:50 PM	#9
John Benton Major Player Join Date: Oct 2005 Location: NYC Posts: 658	It just BAFFLES me that FCP doesnt do 24f yet. J

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