First, we're not going to have "who is right and who is wrong"
discussion in here. I was already afraid it would go that way but
It's just not going to happen. This should be clear and sufficient
enough, I never ask things like this twice.
Second and more important, I agree there are tolerances but what's
acceptable and what's not acceptable and it depends on what you do. I
think the 1/24s drift per 5 minutes of the Zoom isn't acceptable
especially because the drift is always going one way (ahead of the
video), the drift is not going forth and back like a drift due to
crystal differences would. Compare it to an old valve radio using
crystals, receiving short wave stations. It was hard to stay on top
of the station but the selected frequency went up and down, it didn't
go down all the time. So the problem in the Zoom can't be blamed to
crystals alone. Also how is Tascam able to produce a similar device
that doesn't have this drift or a drift that is so small that's not
noticalbe during normal video work? Do they purchase they're
crystal's from some secret factory? Also if playback can be
guaranteed at a certain speed, then how is that done then? Don't use
playback devices things like crystals or other electronics for timing as well?
What you're doing sounds interesting. Apart from the drift you're
also dealing with the absolute timing of each frame especially when
working with faster shutter speeds. You could get rid of the drift
somehow but will a genlock also make each frame start at exactly the
same moment?
By the way I shoot productions using two Panasonic GH2 camera's, one
Europe model and one USA model, both set to 24fps and even with 30
minute shots I never notice anything of a drift, the only thing I
notice is the frames of both camera's starting at different moments
but for what I do, this isn't a problem, in the final product it's
not noticible.
Rieni
At 1-9-2011 16:26, gl wrote:
>No you're wrong. It will play back at that speed, but that's no
>guarantee that it was recorded at _exactly_ that speed. The speed on
>the file is a label only, it tells you nothing about what the exact
>recording speed was (same with the sampling rate on an audio recorder).
>
>The reason is simple, clock crystals driving digital circuits have
>manufacturing tolerances, and are temperature sensitive - that's just
>how it is. These differences are well known issues, that's why genlock
>exists, and also why all digital audio devices in a recording studio
>need to be synchronized or you get severe glitches. I actually run a 3D
>rig with two cameras that don't have genlock, and again they run at
>slightly different speeds and gradually drift out of sync.
>
>So the only questions is how bad the drift between any two devices is,
>and that changes even with devices of the same type.
>--
>gl
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