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What causes drift, and the calibration step that exists to prevent it.
If the audio and picture drift apart in a recording, there are two different causes depending on which encoder your recording used: a computer that couldn't keep up while recording, or a timing offset in the MP4 (WebRTC) pipeline that calibration corrects.
This is the most common cause with the WEBM and MP4 encoder options. If your processor or graphics hardware can't encode video fast enough, video frames get dropped while audio keeps recording at its normal pace, so the two end up out of step. This shows up alongside other symptoms of the same problem - blurry, blocky or choppy video. See Video is blurry, stutters or drops frames for the settings to lower, in order, to fix it.
If you record with the MP4 (WebRTC) encoder preference, there's a second, separate cause: this recording method has its own audio/video processing pipeline, which introduces a small, fixed timing offset between the two on each computer. Rekorder corrects for this automatically with a one-time calibration pass: the first time you select MP4 (WebRTC), a tab opens briefly, measures your computer's timing, and closes on its own a few seconds later. Recordings made afterwards use that measurement to keep audio and video aligned.
If audio and video are out of sync specifically on MP4 (WebRTC) recordings, calibration may have failed or never completed. See Encoder preference and when to change it for what calibration does, what it looks like when it fails, and how to retry it.
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