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Drift

From Chace Audio

Drift is the slow but noticeable loss of audio sync against picture or another audio element, which cannot be accounted for or corrected by any of the common speed conversions (film speed to video speed, NTSC to PAL, etc.)

Drift results when an audio element is recorded or played back without the correct timing reference, or clock. The drifting audio will not lock with the picture (or other audio source) and will require extensive editing or varispeed conforming to get it to match sync.