How do you keep captions synchronized with audio?

How do you keep captions synchronized with audio?

Caption synchronization means the displayed text corresponds to what is being heard at that moment. A uniform offset and gradually increasing drift are different problems.

Diagnose the timing error

If every cue is late by the same amount, inspect leading silence or timeline offsets. If the mismatch grows, check whether audio speed, edits, or duration changed after alignment. Use one consistent time unit across pipeline stages and convert deliberately at boundaries.

Verify the final timeline

Confirm cue starts precede cue ends and that cues stay within the intended media duration. Check whether overlaps are intentional. Play the final exported video, because assembly can introduce timing changes absent from the intermediate audio. Test a longer narration as well as a short fixture. Recalculate timing when audio is trimmed or regenerated instead of applying a guessed offset that only fixes the first few seconds.