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changing the fps in music

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kelly armstrong
changing the fps in music
on Oct 9, 2012 at 9:29:54 am

Hello,

I'm shooting a 50 fps music video tomorrow so I need to change the song to both 50fps and 30fps.

How do I do this on fcp?

Thanks!


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Michael Gissing
Re: changing the fps in music
on Oct 9, 2012 at 9:57:55 am

What is the editing frame rate going to be? if it is 29.97 and the 50fps is to be slowed to 29.97 then you have to speed up the music for playback so that you have sync at 29.97.

With a trusty calculator you can work out the speed difference and then use Compressor to make a sped up version. My quick calculation says 50 fps is 166.9% faster.


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kelly armstrong
Re: changing the fps in music
on Oct 9, 2012 at 10:13:54 am

I understand 50 fps would be 200% sped up, but what would 30fps be?


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Michael Gissing
Re: changing the fps in music
on Oct 9, 2012 at 10:31:45 am

If your edit rate is 25fps then yes 50 is 200%. So take your calculator and divide 30 by 25 and you get 1.2 . So 30 is 120% faster than 25. Make sure the camera is actually shooting true 30 fps and not 29.97. If 29.97 you can get a more accurate %.


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kelly armstrong
Re: changing the fps in music
on Oct 9, 2012 at 10:35:44 am

Okay thanks. I just wanted to make sure I did it correctly .

Thank you!


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kelly armstrong
Re: changing the fps in music
on Oct 9, 2012 at 11:07:00 am

Actually there's a problem.

By speeding up the track, the singers voice sounds like the chipmunks, which is not good.

Is there a way to change the speed so this doesn't happen?


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Dave LaRonde
Re: changing the fps in music
on Oct 9, 2012 at 2:26:49 pm

What form does this music currently take? How do you plan to use it when you shoot?

Most music files don't HAVE a frame rate: they have a sample rate and a bit depth, but no frame rate. If you have to deliver both 50 and 29.97 fps versions of the completed work, you can do a frame rate conversion of the final deliverable file. A 50 to 29.97 conversion probably would be best.

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


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