A one-sentence prompt like “cinematic product ad, 15 seconds” often produces beautiful but unusable footage. Product shape drifts, motion is unclear and scenes do not connect. Start with a shot list.
Break 15 seconds into five shots
Use an establishing shot, a slow detail push-in, a simple usage scene, a feature metaphor and a final brand frame with empty space for text.
One motion per shot
Do not ask for camera rotation, walking, product transformation and changing lighting in the same clip. Keep one main movement per shot to improve success rate.
Use reference images
If supported, start from a clean product image. Specify which parts must not change: shape, logo, buttons, ports and proportions.
Edit the final ad manually
Generate several versions per shot, choose usable clips, then edit with captions, music and pacing in a normal video editor.