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Problem With Audio/Video Being Out of Sync
I’ve got a Mac Pro 2.1 running OSX 10.6.5 w/8 gigs of ram. It’s a quad-core Intel Xeon. We’re cutting with FC 7.0.3 and have a G-Speed 3TB Raid connected with fiber that we use as the primary hard drive. We use only the Apple codec in our sequences. This suite is our best of four suites and runs day in and day out.
For the last month, when I start playing a program in the sequence, the audio and video are synched perfectly. Very quickly the audio and video go out of sync with the audio behind the video. It’s progressive so at the end of a twenty minute program, the audio fades down ten seconds after the video has gone to black. It’s happening with any media we use. We’ve rebooted everything, thrown out the preferences and racked our brains trying to understand where the problem is but to no avail. Any suggestions? -
2 Replies
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Does all audio match the sequence settings (48khz, uncompressed PCM 16 or 24bit)?
Are you monitoring via a Kona card and are the drivers up to date (vers 8 from memory). This applies to any I/O card but I had noticed a sync drift with my Kona3 before updating drivers a few months back.
Also read this to make sure it isn’t a file import problem –
https://library.creativecow.net/lyon_matt/fixing-fcp-assets/1
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I recently had this issue when editing a conference video- listen to the whole thing without skipping any, VERY carefully, you may notice a barely perceptible pop, which can happen either on capture or if the audio went through any kind of mixer/ external audio device. There may not even be a pop, but what can happen is that there can be an odd kind of break/ repeat type thing which may only last for half a second, meaning everything after that slips out of sync. Try and work out exactly where it first slips, and see if that’s he issue.
It may well not be, a number of things can cause this. Good luck!
😀
Tom Morter-Laing
Freelance Editor
Certified Apple Product Proffessional, 2010
http://www.depictproductions.co.ukSony Z5, with Rode NTG2.
iMac 27″ intel i7 2.93GHz, 12GB RAM, ATI HD5750 [1GB GDDR5], 2TB Int. SATA with 2TB External HDD; (FW800), with Elgato Turbo H264HD.
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