> And all 24fps camera capture at 23.976 fps exactly. Have some trust
in modern technology please :-)
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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