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Footage with variable frame rate

Hello,


My footage is a OBS stream:


Frame rate mode: Variable

Frame rate: 30.000 FPS

Minimum frame rate: 29.412 FPS

Maximum frame rate: 30.303 FPS


When I import that mp4 into FCP, the frame rate shows as 29.41 fps however I would prefer 30 fps for my project.


What would happen to the clip when I would set my project to 30fps?

Is this a problem? (dropped or double frames)


Thank you.

Posted on May 12, 2022 5:13 PM

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Question marked as Top-ranking reply

Posted on May 13, 2022 12:40 AM

Does automatic frame rate work with this?


AFAIK it converts any fps to frame-by-frame with the project fps. I have used that to mix 25 and ~30fps footage to a project (AFAIR preserve audio pitch is automatically selected).

8 replies

May 12, 2022 5:56 PM in response to Tom Wolsky

Hello Tom,

Thanks for your quick reply!

It seems you have answered while I was correcting my question.

Because the clip is 29.41 fps, FCP didn't allow

that non-standard frame rate, and I had to select 30 fps.

So to prevent frame problems what would be better:

optimizing (normally I avoid this due to large file size)

or converting the frame rate – is there a simple & good app?

Thanks again.

(The recording can't be repeated, but next time I will avoid OBS altogether –

I know ScreenFlow and Filmage record constant frame rates.)


May 13, 2022 6:15 AM in response to Matti Haveri

Hello Matti and thank you!


I checked the FCP manual and found nothing about "automatic frame rate".

Do you mean "Automatic Speed"? (http://lutslounge.com/retiming-using-automatic-speed-in-final-cut-pro-x/)


> 1. In the Final Cut Pro timeline, select the clip whose original frame rate you want to maintain.

> 2. Click the Retime pop-up menu below the viewer and choose Automatic Speed.


"preserve audio pitch is automatically selected" sounds helpful too. I will test it.

I noticed "Speed Transitions" is also checked by default. Which results does this give?


BTW I also read in the FCP manual about "optimizing":

> Create optimized media: This option transcodes video to the Apple ProRes 422 format, which provides

> better performance during editing, faster render times, and better color quality for compositing.


Nothing is mentioned here about a positive influence on deviant frame rates, so I'm afraid this wouldn't help in my case.


May 14, 2022 8:03 AM in response to coxorange

Result with "Automatic Speed":


It worked! No missing or double frames any more – it looks just normal.


I unchecked the "Preserve Pitch" option, because IMO it sounded a bit artificial at some points – not that it would be bad, but I prefer the modified pitch (+2% in my case).


I couldn't test "Speed Transitions", because my footage was just one long clip (about 1 hour).


This is not only helpful for OBS/Twitch, but also for Capto recordings in variable frame rates.

Footage with variable frame rate

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