1. Cut the pauses
Video models such as Gemini Omni film a timed shot list, and they tend to say each line at the start of its shot and then wait for the next. In our takes that left 1.3 seconds of silence before the hook and up to 2.6 seconds between lines. Real creators do not leave gaps like that; the jump cut is part of the genre.
Find the speech by its loudness in the voice band, not with a flat silence threshold: one breath peaked at -38 dB and hid a 1.2 second pause from a -40 dB detector. Then shorten every pause over 0.7 seconds to 0.35, and keep 0.2 seconds before the first word and half a second after the last. Our 20 second reviews came out at 12.7 to 16.3 seconds, with every scripted word still in.
2. Give every shot a line, and only that line
A silent shot is an invitation. Given 13 words for a 10 second clip, one take added "That's why I love the" and the brand, mispronounced. Another put harp music under a silent closing shot, although the prompt said no music.
Write a line for every shot, allow at most two seconds of silent reaction at the very end, and tell the model in plain words to say only the quoted lines, add nothing, and stay quiet between them.
3. Write like someone talking
Long sentences sound read. One short sentence per shot, 3 to 7 words, sounds said. In English, 16 to 20 words fill a 10 second clip; in Urdu, 14 to 17 (more in our Urdu guide).
Leave out exclamation marks and claims the product cannot back. Hype is the surest sign of an ad, and a writing model adds it even when told not to, so check every line against what the product actually does. Hyzgen's review writer runs a separate check that lists any line making a claim the brief does not make, and writes those lines again.
4. Keep the same room
Each clip is filmed from its own first frame. Draw those frames separately and the room, the light and the camera change every 10 seconds: one of our reviews jumped to a wide mirror selfie at 20 seconds.
Draw the first clip's frame, then draw every later frame from it, in the same place, so the person stays in one room across the ad. When a clip is one continuous shot, say so: told to make "hard cuts" between beats, the model cut a single shot twice.
5. Put the real product in their hands
A video model told that someone holds "the bag" invents a bag. Start every take where the product is in hand from a frame drawn with the real product photos, and tell the other shots that the hands are empty, or the product turns up in every frame.
Close-ups of the product alone are the hardest. Models redraw the packaging at every cut, and the label drifts: one perfume's name came back as different letters three shots later. Cover those shots with a still drawn from the real photo and checked letter by letter against the label, or with the real photo itself.
6. Never let the model draw your app
For an app or a website, the model invents the screen, with made-up text and numbers. Film the creator holding the phone with its screen facing them, then cover the moments the screen should be seen with your real screenshots in a phone frame.
Name the phone as well. An Android-only app reviewed on an iPhone looks wrong to anyone who knows. If the brief says Google Play or Android, the creator should hold an Android phone.
7. Time captions to the voice
Transcripts come with word times, and they are often wrong: 1 to 1.75 seconds off in 5 of 10 takes we measured, and a two second pause sometimes left out entirely, so the captions ran ahead of the speech.
Measure where the speech is in the audio, then lay the words over it in order, each by its length, matching pauses to the ends of sentences and clauses. In the reviews we measured after that change, 89 to 94 percent of caption time sat on actual speech.
8. Check every take, and keep the better one
Transcribe each take and compare it with the script. If less than 60 percent of the script was heard, film it again. Look for a phrase said twice where the script says it once, and for a last line that was cut off.
Keep the earlier take when you retake. A retake is sometimes worse than the take it replaced, and the better of the two should win, not the newer.
9. Label it as AI
TikTok and YouTube both have a setting to declare a video as AI-generated when it is posted. Use it: an AI creator presented as a real customer is the part of these ads that misleads. Hyzgen turns the setting on for every video it posts for you.