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Audio Sync Drift Calculator

Separately recorded sound and picture rarely share a clock. See how far they drift over a take, how often to re-sync, and the playback-rate correction that removes it.

48.048 kHz audio read as 48 kHz — 1,000 ppm
whole minutes
0–720
extra seconds
0–59
rate used to count frames
frames before re-syncing
0.1–120 frames; 1 frame is a common limit
Enter a take length and clock mismatch.

Drift grows linearly: a 1,000 ppm mismatch is 0.1% of the running time, so a 20-minute take finishes 1.2 seconds apart. Whether sound ends up early or late depends on which clock runs fast, so the correction row gives both directions. Re-sync spacing is the allowed drift divided by the mismatch and the frame rate. Everything is calculated in this page; nothing is uploaded or stored.