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23.98 fps to 24 fps export

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George Roberson
23.98 fps to 24 fps export
on Sep 30, 2014 at 5:33:48 pm

Hi all,

I exported a .mov file through quicktime with setting of 24 fps (the original resource is 23.98 fps) and expected the final file a bit shorter than the original timeline sequence on FCP. But the exported file is actually longer (6 seconds longer for a 100 minute movie) - does that make sense at all?

Thanks for your input!

George


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Shane Ross
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 6:15:58 pm

It'll be longer. You are taking something that runs slower than 24fps, and slightly speeding it up to exactly 24fps...stretching it. Time will be added.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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George Roberson
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 8:06:27 pm

Thanks Shane!
When you say: speeding up- shouldn't it be faster, which results in a shorter product?
Quite confused.


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Shane Ross
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 10:02:08 pm

Oh...hmmm..right. 30 to 24 results in slow motion...longer time. Hmmm...OK then...

got me.

Shane
Little Frog Post
Read my blog, Little Frog in High Def


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George Roberson
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 10:04:00 pm

I was wishing you were right though! Because my exported 24 fps file is a few seconds longer than 23.98fps fcp sequence...


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Dave LaRonde
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 11:05:48 pm

Yeah, that's weird. I did some arithmetic indicating that if you conformed 24 to 23.976, 100 minutes of video would gain six seconds.

But 23.976 to 24? No way.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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George Roberson
Re: 23.98 fps to 24 fps export
on Sep 30, 2014 at 11:59:14 pm

It is so strange. Maybe I calculated the timeline sequence wrong?

The FCP 7timeline sequence I used to export the quicktime is from timecode (read on Canvas) 00:59:20:00 to 2:36:00:04. I check the sequence setting and it did say editing timebase 23.98.


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Dave LaRonde
Re: 23.98 fps to 24 fps export
on Oct 1, 2014 at 5:31:41 pm
Last Edited By Dave LaRonde on Oct 1, 2014 at 5:36:52 pm

Well, you could do this -- export the current timeline at the existing frame rate. Plop it into a 24fps timeline. How long is it then?

I'm thinking that QT didn't do a frame rate CONVERSION, which would result in a shorter file.

I think it just tried to spread 23.976 as evenly as it could across 24fps, and that the timecode you read in the 24fps timeline will indicate 6 extra seconds. I think you'll encounter tiny hitches in the motion every so often when you scrutinize the file. In other words, QT didn't do a frame rate conversion, nor did it conform to 24.

In which case, you ought to use Compressor for this job.... and Compressor isn't known for its blazing speed in doing frame rate conversions. It'll take a while.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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George Roberson
Re: 23.98 fps to 24 fps export
on Oct 2, 2014 at 8:25:17 pm

Thanks Dave, I haven't tried your method yet. But now that I thought I have a longer running time exported .mov 24fps file but it is not true. My final file, based on DCP making company, is 23.98 fps! how could this happen? - I exported using quick time with setting of apple pro res 422 24p 48Khz. or maybe this 24 p means 23.98?


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Dave LaRonde
Re: 23.98 fps to 24 fps export
on Oct 2, 2014 at 11:27:20 pm

Indeed it does: you did a frame-for-frame export at precisely the same frame rate.

Why do you need true 24 fps, anyway?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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George Roberson
Re: 23.98 fps to 24 fps export
on Oct 3, 2014 at 12:54:58 am

but why the running time is different?

What's the precise way to see the fps at timeline sequence on fcp?
I checked the sequence setting - not correct?


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Dave LaRonde
Re: 23.98 fps to 24 fps export
on Oct 3, 2014 at 2:54:09 pm
Last Edited By Dave LaRonde on Oct 3, 2014 at 3:45:41 pm

If you import the file in question into FCP, you will see an accurate frame rate in the browser. Okay, ALMOST accurate: 23.976 will show up as 23.98.

In any case, in order to go from 23.976 to 24, you can't simply export a timeline using QT, changing the frame rate to 24; you won't get the results you intend. You need to do a FRAME RATE CONVERSION, which is a different process. It requires a plugin like Twixtor or using Compressor to do it.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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