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All guides · Quality and captions ·

Review spoken words and lip sync in an AI ad

Lip-sync review combines two checks: did the video say the approved words, and does the visible speaking performance fit the audible speech? Start with the words. Perfect-looking mouth motion is not acceptable if the line introduces an offer or claim you never approved.

Keep the exact script beside the video

Imagine an illustrative mug ad with the approved line, “See the curved handle and the blue glaze.” Compare that line with the actual audio, including the first and last words. “A cooler drink all day” would fail even if it sounds fluent, because it changes the message and adds an unsupported outcome.

First listen without looking at the face. Note missing words, added words, mispronunciations and a cut-off ending. Then replay with the picture. This separates a script-compliance issue from a visible synchronization issue, which may need a different revision.

Watch the speaking window

  1. At the start of the line, check whether the mouth begins moving with the voice rather than noticeably before it.
  2. During clear syllables, look for a plausible pattern of opening and closing, without trying to judge one isolated frame.
  3. At pauses, check whether the performance actually pauses instead of continuing an unrelated speaking loop.
  4. At the end, confirm the last word finishes and the face settles naturally.

Use normal speed for the primary decision. Slow playback can help locate an obvious mismatch, but it also makes small performance differences easier to overinterpret. The useful question is whether a viewer watching the ad normally sees a distracting separation between speech and expression.

Check which voice the brief requires

A product-led voice-over does not require a mouth to speak on screen. If the camera shows only the mug, review the audible line and timing rather than inventing a lip-sync criterion. Conversely, if the creator is visibly speaking, a voice-over that continues while the mouth stays closed needs attention.

In fairytale video, approve the spoken lines in the ad settings and choose the voice deliberately. The render uses the chosen voice sample as a reference when there are spoken lines. That reference helps direct the output; it does not remove the need to listen to the finished result.

Choose a specific next action

If the line is too rushed, shorten the approved speech or allow more time within the available duration. If a complex product gesture and speech compete, simplify the gesture. If the audible words are wrong, do not disguise them with correct-looking captions: captions transcribe what the video actually says.

Preserve the original render, record the failure and review any new paid version from the beginning. Use spoken-line rehearsal, audio review and caption word checking to keep those decisions connected without conflating them.