Image-to-video models are surprisingly literal. Give them a vague prompt and they invent motion you didn't want; give them a clear start frame and a short, specific motion brief and they behave much more like a camera operator. Here is the checklist I use.
1. Let the start frame carry the composition
The single biggest upgrade is to stop describing what is already in the image. If your start frame shows a red bicycle leaning on a brick wall at dusk, the model can see that. Repeating it in the prompt mostly adds noise and invites the model to "re-imagine" the scene.
Instead, spend your words on what should change:
- what moves (the subject, the background, the light)
- how the camera moves
- how fast things happen
A good rule of thumb: if a sentence in your prompt would still be true of the frozen image, cut it.
2. One camera move per clip
Short clips (5–10 seconds) rarely survive two camera moves. Pick one:
| Move | What to write | Good for |
|---|---|---|
| Push in | "slow push-in toward the subject's face" | emotion, reveals |
| Pull out | "camera slowly pulls back to reveal the street" | context, endings |
| Orbit | "gentle 30-degree orbit around the product" | products, objects |
| Pan | "slow pan left following the cyclist" | landscapes, tracking |
| Static | "locked-off camera, no camera movement" | dialogue, subtle motion |
Writing "locked-off camera" explicitly is underrated. Without it, many models add a drifting handheld feel you didn't ask for.
3. Describe motion with verbs and pace
"The woman moves" gives the model nothing. "The woman turns her head toward the window, then smiles slightly" gives it a beat sheet. Useful pace words: slowly, gradually, a sudden gust, in one smooth motion. Keep it to one or two actions; three is where faces and hands start to warp.
4. Keep secondary motion small
Ambient motion makes a clip feel alive: hair in a light breeze, steam rising from a cup, leaves drifting. Ask for it in small amounts ("subtle", "light") so it doesn't compete with the main action.
5. A template you can copy
[camera move], [main subject action with pace], [secondary ambient motion], [lighting change if any], [style/mood constraint]
Example for that bicycle frame:
Slow push-in, a cyclist walks into frame from the right and grabs the handlebars,
a few leaves drift across the pavement, streetlights flicker on, calm cinematic mood
6. Compare models with the same frame
Different video models interpret the same prompt differently: some favor smooth camera work, others are better at faces or physics. When a shot matters, I run the same start frame and prompt through two models and keep the better one. Hailuo3, an independent studio (not affiliated with MiniMax), puts several of these side by side, for example Hailuo 02 and Hailuo 2.3, on its image-to-video page. It also shows the credit cost before you submit, which helps when you're testing variations.
7. Debugging checklist
- Subject morphs into something else → shorten the prompt, remove adjectives that redescribe the frame.
- Camera drifts → add "locked-off camera" or name exactly one move.
- Motion too fast → add "slowly" and reduce the number of actions.
- Flicker in textures → simplify the start frame (less fine pattern detail) and ask for less secondary motion.
Start frames do the heavy lifting; the prompt is the direction. Keep the two jobs separate and your clips get much more predictable.
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