I kept a product photo on my desktop because it was technically correct and completely dead. Same bottle, same light, same flat shadow. Image-to-video fixed the part a photograph could not, motion. But it did not fix a bad reference image, and it did not make a $0 final ad. Here is the version I wish someone had told me before I burned a bunch of credits.
How image-to-video works
The model predicts plausible motion from a static frame. Waves, clouds, hair, fabric, steam, and rotating products can all move. It does not know your product rules unless you state them. If the cap is metal, say metal. If the label must stay legible, say that too.
Models I would use on imgmov
Agnes Video V2 is the guest-trial model for image-to-video. It is the cheapest way to find out whether an idea has motion at all. The guest trial is three watermarked previews per guest per day, 1K, one result at a time, and no commercial delivery. At paid list price it is 2 credits per second.
Seedance 2.5 is my default for controlled commercial motion. It is 18 credits per second at 480p and 39 credits per second at 720p, so a 5-second 720p clip is 195 credits. Use it after the concept works.
Kling v3 Omni is 39 credits per second, or 49 credits per second with native audio. I pick it when face, product, or temporal identity needs to stay stable.
Veo 3.1 is 80 credits for 4 seconds, 125 for 6, and 165 for 8. I use it for hero footage where atmosphere matters more than repeating twenty variants.
How to choose
Most of the time you do not need the most expensive model. Here is my routing.
Just testing composition? Agnes Video V2. Use the guest trial, then stop when the answer is yes or no.
Need controlled commercial motion? Seedance 2.5. Price by duration and resolution first.
Need stable identity and audio? Kling v3 Omni.
Need atmosphere for a hero clip? Veo 3.1.
Prompt rules that saved me
- Name what changes, and only that. A cap unscrewing, steam rising, fabric moving, camera pushing in.
- Separate subject motion from camera motion.
- Add a speed. 「slowly」 and 「gently」 are not decoration.
- Lock the background if the model keeps inventing new props.
- Use the real product photo as a reference, not a text-only description.
A stainless steel water bottle on a light gray pedestal, the label stays unchanged, subtle contact shadow, water droplets move slightly under studio light, slow 180-degree rotation, slow orbital camera, clean commercial product videoFailure checklist
- Shape changed. Shorten the motion or improve the source photo.
- Label warped. Reduce movement near the label or composite text later.
- Background invented props. Add 「no new objects」 and lock the surface.
- First second is static. Trim it or front-load motion.
- Social clip feels dead on phone. Raise motion energy or camera speed.
Final workflow
- Start with the best source image you have.
- Run one guest-trial test for motion.
- Fix the prompt, not the price.
- Only upgrade the winning version.
- Export the platform format after review.
FAQ
Q: Can image-to-video keep an exact product unchanged?
A: It can get close, but you must use a reference image and inspect shape, color, and text. For complex labels, keep motion subtle or composite the untouched product in post.
Q: Is the guest trial good enough for final work?
A: No. It is watermarked, limited to three previews per guest per day, 1K, one result at a time, and not approved for commercial delivery.
Q: How do I avoid wasting credits?
A: Validate motion with Agnes Video V2, save the prompt, then regenerate only the winner with Seedance 2.5, Kling v3 Omni, or Veo 3.1.