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A/V Sync drift when mixing .wav and .aif files
Using: 3.2GHz MacPro, 8GB RAM, Kona LHe, internal 3TB RAID-0 stripe, playing back ProRes HQ at 1920×1080, 23.976PsF. OS10.5.4, FCP 6.0.4, QT 7.5.5, Kona Driver 5.1NDD.
Problem: Getting FCP project delivered with mixture of .wav and .aif files and the sync is drifting. When I stop and start the play head, the sync returns, only to drift out in seconds. The AIF files stay in perfect sync, the .wav files are the ones that drift. All audio is 24-bit 48khz. The system that delivered the project isn’t having any issues.
Anyone else seen this? Is the only fix to convert all .wav files to .aif? Why is the problem only existent on this machine and not the other one?
Struggling with this one. Thanks.
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5 Replies
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Hi,
If the .wav files are BWAV/BWF it might be your FCP settings. Compare them to the other machine where it stays in sync.
Andreas
Spherico
https://www.spherico.com/filmtools -
not .bwf or .bwav files. These are .wav files. Is it possible this is a reference issue?
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I didn’t mean the extension, I meant the type of file.
A BWAV/BWF file does have the .wav entension.Andreas
Spherico
https://www.spherico.com/filmtools -
Update: Converting the .wav files to .aif is not fixing the problem. There’s something associated with these specific files that’s causing the problem. It’s only on this system. I’ve moved the project to two other systems without issue. Just this one setup. These .wav files were created from another editor’s FCP system. They are not broadcast wave files.
So weird.
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Problem solved. It was a combination of things. Once we realized the sync issue was NOT related to media (drifted on any type of media), we reinstalled Kona drivers, moved the card to another slot, and then went through the FCP settings again. Voila.
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