Videomaker – Learn video production and editing, camera reviews › Forums › General › Video and Film Discussion › Questions about Sync, SDI, and Genlock › For all the mention of “
For all the mention of " double system " audio ( running a separate audio recorder ) in these forums, I'm surprised that there is so little discussion of lip-sync drift. In general, I suspect that the higher the quality of the devices used ( and supposedly the more stabile internal clocks ), the less drift . . . . . but my history includes film cameras and Nagra tape recorders which HAD to be referenced to a common source, or at least to very accurate crystal oscillators in order to maintain sync. As a test some time ago I shot a small concert with my HVX-200A and a Korg MR-1000 digital audio recorder. In Post I was impressed that the drift was so small over an hour of running time. I recall that I had to make two 1-frame adjustments . I don't have any experience with the Zoom recorders and their ilk, but I'm skeptical that they have any provision for external word clock reference, so what ya get is what ya get for sync.