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RE: WAY OT: Video Sync
Problems like this sometimes stem from confusion surrounding the fact
that there's both a video frame rate and an audio sample rate
involved. I very often see pulldown related drift problems, for
example when a "29.97 non-drop, 44.1kHz" project really turns out to
be 29.97fps, 44.056kHz. (44056 is to 44100 as 29.97 is to 30). There
isn't a universal standard for pulling down audio clocks along with
video rates, afaik. This can be a major headache when cutting a 24fps
film on video equipment, then mixing it to film.
Unfortunately, the amount of drift you describe is much greater than
the .1% error typical of video pulldown problems. Nonetheless, if the
drift seems to be a consistent gradual slippage rather than a few
sudden jumps, you could hack your way out of sync hell by
sample-rate-converting the mix and/or tweaking the audio rate
settings in Nuendo (if there are any!).
At 4:33 PM -0600 2/6/02, Graham, Lindsay wrote:
>Yeah, --if I understand you correctly-that is exactly what I did. Mixdown
>the whole project to an AIF file, then replace it in the original
>file. Though I may have been able to get it to resemble being sync'd in
>Nuendo, it sure as hell isn't sync'd after being placed in the QuickTime
>left of eliot
> -----Original Message-----
>From: Stephen P. Goodman [mailto:firstname.lastname@example.org]
>Sent: Wednesday, February 06, 2002 4:26 PM
>Subject: Re: WAY OT: Video Sync
>Perhaps you need to save the file first as a single AVI/etc file, and then
> > I'm scoring a short (8+ min) local DV project and am having a fit with
> > issues.
> > Here's the lowdown:
> > I was given a QuickTime file of the final visual edit. I'm using
> > a PC, which can import and display video, so that's cool. I finish my
> > preliminary score, making sure certain moments in the audio line up
> > certain frames of the video. Ok, great. However, even though I took
> > care to line up an audio event with a video frame-and it does indeed
> > to be in sync if I place my cursor at that position in the
> > play the file from the beginning, the sync drifts. Ok, so that's
> > so I make sure I set up my Nuendo project the with the same frame
> > the QuickTime file. In the media pool, the QuickTime is described as
> > 29.97fps, so that's what I set my project to (and my timeline view
> > Same problem: drift. I talk to the film maker and he says he's
> > 29.97dfps (drop-frame), so I say, Ok, reconfigure my project, realign
> > the audio events and, low and behold, the thing seems to be in sync
> > it when I ignores the drop-frame that it appeared to be in sync-I
> > remember). That is, up until I replace the audio in the original
> > file and now I'm off like eleven seconds over the 8:20 project!
> > It's at this point that I took the CD containing the QuickTime file
> > tried to swallow it.
> > I've hit the Nuendo website and support is thin. I don't expect a
> > from customer service for a while.
> > Anyone with actual hands-on experience know the answer to this?
> > Lindsay Graham
> > sonic detritus:
> > left of eliot
> > http://leftofeliot.iuma.com