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Pro Tools --> Final Cut Pro --> sync problem

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Torgeir Arntzen
Pro Tools --> Final Cut Pro --> sync problem
on Jun 8, 2011 at 9:36:48 am

Hey!
When importing the audio file bounced from Pro Tools after the sound mix was finished, the sound ended up drifting out of sync in Final Cut. (Sound appears shorter than video, 1-2 seconds pr. 10 minutes). Both the Pro Tools and the Final Cut sessions were set to 25 FPS, audio samplerate were 48kHz.
I've had an experienced Pro Tools user look at the Pro Tools session, and he is saying that the problem probably lays in the Final Cut session. Any ideas?


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Michael Kammes
Re: Pro Tools --> Final Cut Pro --> sync problem
on Jun 8, 2011 at 2:16:24 pm

Verify the PT project is at 25fps.

The audio mix that you got from your sound person, load it up in QT and check the frame rate.

Do a spot check inside FCP AFTER you get the audio mix to verify it's drift - and not just a poor offset (i.e. spot check by jumping ahead every minute or so, seeing if loss of sync is there or it only happens when playing the sequence for awhile)

Drift is usually caused by someone doing a frame rate conversion, or adding a pullup (or pull down). Since the difference is slight (and cumulative) it gets worse over time.

~Michael



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John Pale
Re: Pro Tools --> Final Cut Pro --> sync problem
on Jun 8, 2011 at 3:45:32 pm

Make sure of the Easy Setup selected in FCP when you import your audio. If it wasn't 25 fps (and its possible to have a project with many time bases...so just because your sequence setting is correct, doesnt mean anything) your imported audio will inherit the timebase of that setting.


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Chris Borjis
Re: Pro Tools --> Final Cut Pro --> sync problem
on Jun 8, 2011 at 4:32:23 pm

[Torgeir Arntzen] "he is saying that the problem probably lays in the Final Cut session"

everyone likes to say that....but the truth is it could be either.



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