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Wander sync captures (24pA)
I’ve experienced this before, usually rare and spotty, and have just made adjustments and lived with it. But on this project I’m having massive sync issues on at least a third of my thirty-four hours of captured media.
The material is in sync on tape, all recorded 24pA, 48kHz. Timecode is continuous on these cloned tapes. But audio sync on the captured / pulled-down material often drifts over time. Sometimes it is 48kHz (yet still drifts), and sometimes it is not quite 48k. It may be 48,175Hz, or 48,0040Hz.
What is this about? Again, on tape it is in sync.
Thank you, somebody, for your thoughts! Fixing this shot-for-shot on my 34 hours of captured material is a real drag.
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6 Replies
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Did you capture whole tapes or log and capture?
i have to look up the audio sample rate dealy, that’s happened before on this forum but I don’t remember the fix.
Jeremy
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Yup, big capture nows…
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Yeah, that’s probably your problem. When ever you are removing pulldown on the fly with FCP (be it 24pA dv or 720p dvcpro HD) you really need to log and capture as the pulldown cadence might not be consistent across the entire tape. If the operator changed a battery in the middle of a tape, reviewed a clip in the middle of the tape, a tc break, anything can break that cadence.
Try capturing in smaller segments and see how that goes.
Jeremy
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Thanks – well, though being able to recapture thirty-four hours — shot for shot — in a day or two down time isn’t gonna happen.
It’s funny, because the drift (and it’s a drift, not a simple offset) begins right away. It doesn’t “pop” in after a tape break or anything like that. Still?
“THE LOST SKELETON OF CADAVRA” –
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[Bill Russell] “It’s funny, because the drift (and it’s a drift, not a simple offset) begins right away. It doesn’t “pop” in after a tape break or anything like that. Still?”
Thats because according to the clone you are digitizing from – there may not a TC break so the audio it is capturing is correct.
Do yourself a favor.
create a new seq turn off all RT and see if the clips need to be rendered for playback, and if so what is causing the render to activate.my guess is the the audio drift may due to poorly cloned tapes.
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD -
Gary might be on to something, but in answer to your question, yes, still.
As FCP begins to capture and not know what to do with the pulldown it is basically creating a rogue capture where audio and video aren’t processing together even though FCP thinks it is.
Do me a favor, capture ONE of the tapes log and capture and see if it drifts.
ALso, if you have a firewire deck and a firewire drive on the same bus, you could be causing some conflicts.
Figuring this out now will save your a$$ later, 34 hours of tape or not.
Jeremy
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