Preserving frame rate option in nested compositions has no effect!!

[Walter Soyka]

What specifically are you trying to do?

A 24fps master comp will itself render 24fps; a 60fps comp nested within it will still be subject to the constraints of that final 24fps comp upon output.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive   |   RenderBreak [blog]   |   Profile [LinkedIn]

[Ali Jassim]

What specifically are you trying to do?

A 24fps master comp will itself render 24fps; a 60fps comp nested within it will still be subject to the constraints of that final 24fps comp upon output.

I know that already, but you can prevent that by selecting the option “Preserve frame rate when nested”. It means that if you nest 60fps comp into 24fps comp, its layer will stay at 60fps, where any other layers in the final 24fps will run at 24fps. I saw that many times, I’ve attached a video link on YouTube to see by yourself.

https://www.youtube.com/watch?v=XTs9mPJY-3U

He is Indian and I don’t understand what he is saying, but what he did is very clear and understandable. He nested three comp (60fps, 25fps and 8fps) into 25fps comp. All nested comps were running at the same frame rates been sett for them in their original comps. They didn’t get effect by the final 25fps comp.

I hope now it’s clear for you.

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[Walter Soyka]

[Ali Jassim] “you can prevent that by selecting the option “Preserve frame rate when nested”. It means that if you nest 60fps comp into 24fps comp, its layer will stay at 60fps, where any other layers in the final 24fps will run at 24fps. I saw that many times, I’ve attached a video link on YouTube to see by yourself… He nested three comp (60fps, 25fps and 8fps) into 25fps comp. All nested comps were running at the same frame rates been sett for them in their original comps. They didn’t get effect by the final 25fps comp. “

You cannot escape the frame rate of your output comp. It is the rate at which the precomps will be sampled in time. What the “preserve frame rate when nested or in render queue” switch changes is HOW that resampling occurs. When checked, Ae will treat the comp like footage, pulling only “existing” frames from the comp as if it were rendered media, and displaying them at the output frame rate. When unchecked, Ae will re-evaluate the contents of the comp at the time of the containing comp, without being subject to the precomp’s frame rate.

In the demo you showed, the 60 fps precomp will show 25 frames in one second with minimal motion blur, but it is skipping 35 other frames every second to get down to 25 fps. The 25 fps precomp will show precisely 25 unique frames in one second with normal motion blur. The 8 fps comp will show 25 frames with lots of motion blur in one second, and it is repeating 17 frames every second to make up the difference between 8 and 25.

Check out this demo, where I expand upon the demo you showed:
10693_preserveframerate.aep.zip

Again, maybe this would be easier to explain in the context of your practical question.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive   |   RenderBreak [blog]   |   Profile [LinkedIn]

[Ali Jassim]

Thank you Walter for your help.

It’s clear to me now, but is there any way that I can add two clips with different frame rates in one comp and preserve the frame rates of both them? I saw many videos (like Vlogs) on YouTube where some people record their vlogs with different cameras those record in different frame rates. The clips of their recordings shift from 30fps to 60fps and vise versa.

Thanks

[Walter Soyka]

[Ali Jassim] “The clips of their recordings shift from 30fps to 60fps and vise versa.”

In this case, work in a 60 fps comp. You can faithfully display 30 fps content in a 60 fps comp (every frame is simply doubled), but you cannot faithfully display 60 fps in a 30 fps comp (every other frame would be skipped).

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive   |   RenderBreak [blog]   |   Profile [LinkedIn]