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FCP7 audio sync drift MEGA-weirdness
Long story – so bear with me (also posted in the AJA Kona forum):
I edited a short film 2 months ago which was just accepted into a festival – requiring me to bring up the old project and fix some grades and lay in a new audio master from the sound designer. I did the original edit and grade on FCP2 – and have since updated to FCP3.
In the meantime I’ve been editing a feature shot-on-RED and had to uninstall all my Kona 3 drivers as they were affecting the framerate playback in FCP.
Now to fix the short film I’ve reinstalled the new Kona 3 version 7.0 drivers. I’ve laid in the new audio track and for no apparent reason the sync gradually slips over the course of the 17minute film until by the end it is several seconds out.
Here’s the kicker – the original audio mixdown from the sound designer is in perfect sync (after reimporting it and dropping it into the timeline). And if I stack the new and the old files on top of each other in the timeline and turn on Audio Waveform display they are PERFECTLY aligned the entire way. But if you play them – you gradually hear the new track delaying more and more as the film plays. So it seems to be a playback issue rather than a problem with the file. Although I tried exporting the whole sequence to a Quicktime and it’s still got the same sync problem (in Sync at the start but way out by the end). I’ve also tried a myriad of Audio/Video settings combinations but to no avail.
Also, when I drop the new audio file in it has a green ‘render-me’ bar on the clip itself in the timeline. The audio file is a WAV – but I’ve tried converting that to AIFF via Quicktime and the issue is the same.
Workstation config is as follows:
2 x 3.2ghz Quad Core
8gb RAM
Dual 4gb fibre-attached to XSan2 volume (20tb (usable) promise RAID storage pool – currently getting 250MB/s avg read)
OSX 10.5.7
FCP3
Kona3 with version 7.0 driver
REDrocket card
2 x 30″ cinema display
JVC 24″ broadcast LCDProject settings as follows:
RED Anamorphic – converted via Monkey Extract to 2048×1080 DPX (with aspect ratio padding) and graded in Color then output to 2048×1080 AJA 10bit RGB codec and sent back to FCP
24fps
audio – tried both 16bit48khz and 24bit96khz (received both from sound designer) – same issue.thanks in advance,
dan graetz
https://www.graetzmedia.com -
9 Replies
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Funny I came here in the off chance I would see something like this as I’m having similar issues.
Last year finished a TV series and all was good. Now they want to do international versions so it needs a remix.I have since upgraded to FCS3, but didn’t think it would affect this job.
I exported the Masters as DV reference files for the audio mixer, who did his work.
Sent back the new WAV files and I placed them on new tracks.Just like you they start off ok but very quickly begin to drift out of sync to the point where I reckon
it must be close to two seconds by the time I reach the end of the show. (24 minutes)What’s even weirder is that the waveforms are drifting out a bit but nothing like what I’m hearing.
Maybe 4 frames difference.Bizarre.
R E D N A I L – M E D I A
web: http://www.rednail.com.au
email: rednail@me.com -
hi Sean,
I just received this reply over in the Kona forum from Jeremy Garchow (I’ve tried the steps below and it’s fixed the problem):
‘Very important.
Delete the new mix from the timeline and your project.
Reset an FCP easy setup that matches your timeline which sounds like 2K 24.0.
Quit FCP, then reopen the project.
Reimport your sound mix and then put it back in the timeline.
In sync? (not the boy band).
Jeremy’
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Mate! What can I say?
THANK YOU THANK YOU THANK YOU.
You just saved me hours and hours of trouble shooting. I was fearing my weekend was about to consist of a clean install of OS 10.6 followed by FCS3. But now it’s absolutely perfect.
Cheers. I owe you a beer.
R E D N A I L – M E D I A
web: http://www.rednail.com.au
email: rednail@me.com -
i got the same bug. relaying new audio (wich is supposed to be sinc) on the timeline…on two stations. one with a kona3 card and one with a BM HD extreme. the ‘out-of-sinc’ disappears when you disable the videocard. i really really begin to hate FCP.
the other day i got a 4x HDCAM dump at 11 PM and the audio went out of sinc as descibed above. the client freaked out..
beginning to question the ‘pro’ on the pro-apps -
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OMG !! Thank You..
I only wasted the good part of one day chasing this insanity around.For others searching for this I will add a few tags..
I noticed it when switching between FCP 7 and Logic 9
Snow Leopard 10.6.2, Sync Problems, Drift, Final Cut Audio Export
aif duration, media start media end not matching timeline duration,
Waveform wierdness.. !Ugh!Thx
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Thank you! Your solution saved me a lot of head ache.
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Thank you so much guys!
I had the same problem with a ProRes timeline and a HDV Easy Setup!! -
Saved my bacon – thanks so much!!
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