On Saturday 17 March 2007 23:11, Steven M. Schultz wrote:
> On Sat, 17 Mar 2007, Anne Wilson wrote:
> > About 20 minutes into editing a long recording I realised that the sound
> > was way out of sync.  Much of the sound previous to that was background,
> > not...
> >
> > By the end, around 45 minutes, it was around 6 seconds late.
>
>       You say the sound is 'late' - meaning that you see something happen
>       and then 5 or 6 seconds later you hear the sound.
>
Yes

>       If audio data had been lost/cut you would hear the soundeffect first
>       and then later see the action.
>
Of course.  Sorry :-)

>       That sounds like several seconds of video frames were lost.  This would
>       have the effect I describe above - you see something earlier than it
>       sounds because video has been lost.
>
> > I'm not sure whether it was lost in one chunk, or whether it had crept
> > up, but I suspect a single chunk, as it was around 5 seconds when I first
> > noticed it.
>
>       Sounds like a frame dropping problem somehwere.  6 seconds would be
>       ~150 frames.
>
That's a lot to lose, and I didn't notice any unusual lines on the console 
while it was recording.

> > I've never come across this before.  Any idea what may have caused it?
>
>       What are you using to record?  I can't say I've heard of any problems
>       with quality DV converters (Canopus is a good example).
>
>       I haven't heard of this problem before.  Can you re-do the capture?
>
It was recorded with a DC10+ - and I've never had the problem before.  I've 
done miles of tape :-)

No big deal.  I have the original and have redone the affected part.  It's 
most odd, though.

Anne
>
>
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