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Posted by Specs on 01/31/06 16:22
> I'd suspect the editing package which I presume is splitting the audio and
> video so they can be manipluated and for some reason at this point it is
> loosing the sync relationship.
> Possibly the camera is recording the DV stream with slightly off sample
> audio and this only shows up when the audio is seperated forom the video
and
> the audo sample is then clocked at the expected rate rather than the
actual
> rate.
> This would need some testing to prove.
>
You've hit the nail on the head as that is exactly what is happening. Canon
appear to be well know offenders in this regard. Any audio clock difference
from the expected 48kHz is noticed during import to the NLE hence the audio
drift being noticed on the timeline. The audio can drift perhaps as much as
a frame every couple of minutes and a long capture will almost certainly be
noticeable. Sony camera clocks tend to be more accurate and drift much less
but it is always better to capture shorter sections if possible. Or use
DVCAM of course.
I see to remember this was reported by a FCP engineer who brought it to
public attention a few years ago.
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