So, your CVDisplayLink has an "output time", and the frames you get from your QTCapture connection have a "presentation time", and the numbers look awfully similar, give or take a small offset. You might be forgiven for thinking that both sets of timings share the same timebase.
They don't. The clocks skew relative to each other, and quite fast, too (two or three seconds over ten minutes or so).
You have been warned.
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