How long, you ask? Take the maximum acceptable offset between video and sound to be 15 milliseconds (cf link); this small interval would be 33 ppm of the whole recording, hence T = (1e6/33)*15e-3 = 454 seconds! After about 8 minutes the drift is out of spec... The solution? Split the tracks and realign them again each time the offset is bigger than 15 ms. My software suite will have a dedrift program for correcting high drift device takes. ffmpeg based, but how? 🤔
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