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24p to 2997 what is correct method

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Phil Coulloudon
24p to 2997 what is correct method
on Sep 22, 2011 at 6:07:55 pm

I have 24p tiff image sequences and need to convert to ProRes4444 at 29.97fps. The content is animation.

What is the correct procedure for re-timing these in AE CS5?

Thanks,
Phil


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Dave LaRonde
Re: 24p to 2997 what is correct method
on Sep 22, 2011 at 6:39:18 pm

It's surprisingly simple:
  • Conform the image sequence to 23.976 fps, the film frame rate associated with 29.97. File>Interpret>Main, then type in the frame rate.
  • Drop the newly-conformed image sequence onto the Make Comp icon at the bottom of the project window. AE makes a comp in the proper resolution and frame rate, 23.976.
  • Add the comp to the AE Render Queue or use the Make Movie command; either works to get the comp there.
  • In the Render Settings, set the proper field order for the comp. 1080 is upper field first, and SD (e.g. 720x480) is lower field first.
  • Also in Render settings, select add 3:2 pulldown. I'm lazy so I pick the first pattern just 'cause it's first. AE will now add pulldown to get to 29.97.
  • In the Output Module, select the codec of choice.
  • Select a file path for the rendered file, save the project, and hit the render button.
If you're rendering a 720P file, you'll have to jump through a few more hoops to get done.

Here's info on the Render Settings:
http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c11...

...and here's info on adding pulldown:
http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c11...

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Phil Coulloudon
Re: 24p to 2997 what is correct method
on Sep 22, 2011 at 9:43:41 pm

Thanks Dave...I will look at the resources you supplied.

I want to note that I am not ever going to tape, staying in file based environment. Editing in both MC and FCP at 1080p/2997.

This is character animation source that will eventually be synced with sound. Do I still need to select the 23.976 instead of 24 for the Interpret footage and add 3:2? I have been selecting 24 and changing composition settings to 29.97 and rendering out ProRes.

Thanks,
Phil


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Dave LaRonde
Re: 24p to 2997 what is correct method
on Sep 22, 2011 at 9:54:34 pm

The thing about 1080 is that the ONLY tried and true way to get 23.976 to 29.97 in AE is to add interlacing. If you happen to have Final Cut Suite 3, you could use Compressor to go from 23.976p to 1080 29.97p.




[Phil Coulloudon] "I have been selecting 24 and changing composition settings to 29.97 and rendering out ProRes."

Bad Idea. The motion will be choppy, because there will be duplicated frames along the line.



[Phil Coulloudon] "This is character animation source that will eventually be synced with sound."

I'd like to know why you simply can't animate at 29.97p and be done with it. You'll save yourself a boatload of problems.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Phil Coulloudon
Re: 24p to 2997 what is correct method
on Sep 23, 2011 at 4:34:39 am

[Dave LaRonde] "I'd like to know why you simply can't animate at 29.97p and be done with it. You'll save yourself a boatload of problems."

The animation exists as true 24p and will not be changed. I do not want to introduce interlacing into a file-based 1080p/2997 (if that is what choosing fields and adding 3:2 will do) or am I misunderstanding.

Phil


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ben g unguren
Re: 24p to 2997 what is correct method
on Sep 23, 2011 at 12:17:15 pm

I see your problem -- interlacing (like 3:2 pulldown) is only a good idea when the delivery format is a television.

Dropping the 24 into a 30fps comp will cause every 5th frame to be duplicated, which creates choppy motion. In the end, it's your call, however -- there are times when somewhat-choppy motion has been an acceptable option compared to the alternatives.

Another possibility comes to mind, however: the Timewarp filter. Drop your 24fps sequence in a 30fps comp, apply Timewarp, then change the speed parameter to 80% to go from 24fps to 30fps. The filter will use the existing image data to create new frames (using a kind of morphing technology). The success of this process largely depends on what the existing images are doing -- it's best to apply the filter and see what happens.

Ben Unguren
Motion Graphics & Editing
http://www.mostlydocumentary.com


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