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Plural eyes gradually going out of sync ...?

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josh smith
Plural eyes gradually going out of sync ...?
on Mar 21, 2013 at 10:23:41 am

Hi Guys,
Cant work this one out....
Im working in FCP 7 , shot an interveiw on a cannon 7D and recorded sound seperatly on a zoom h4. I got all the got both the sound and video clips into a sequence in FCP and sellected them both and hit plural eyes. It does make some adjustments, infact the start of the interveiw seems fairly in sync but it slowly goes more and more out of sync suggesting one is going faster than the other ...? could this be ...? its only 5 mins long.

Any help vey much appreciated !! :)

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Rob Wiltsey
Re: Plural eyes gradually going out of sync ...?
on Mar 21, 2013 at 4:19:22 pm

Actually, yes one track is going slightly faster than the other! Most likely, the audio clips were recorded at different sample rates (44.1khz and 48khz for example). Over time, they will go out of sync and this will become more noticeable especially on longer clips.

One really quick fix (that audiofiles may not prefer, but works nonetheless) is to change the speed of the longer clip to make it the same duration as the shorter clip (by selecting the clip and pressing command-J). It may take a very small change (in the neighborhood of 100.3%) for the clips to be virtually in sync. Play with it a little.

One effect of this will be that the clip will be slightly higher pitched than before, but the change will be so slight that it is totally indistinguishable from the other clip. I have had to do this many times in a pinch.


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Michael Gissing
Re: Plural eyes gradually going out of sync ...?
on Mar 25, 2013 at 6:13:40 am

The most likely scenario is that FCP has incorrectly flagged the imported wav files with the wrong frame rate. Yes check the sample rate and if it is 44.1 then convert the files to 48khz. Compressor can do this.

However the importing of audio files into FCP must always be done after checking that your Easy Setuo and current project sequence has the same frame rate.

This tutorial explains it and also offers a way to fix a project and the second half explains the correct import procedure.

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