# Motion Brief Checklist: Preserve, Action, Lens, Pacing

![Motion brief — Preserve / Action / Lens / Pacing](https://cdn.hashnode.com/uploads/gql/6ac7155f8cadc38d9e483af7/e511c878-2140-46cd-b519-e31cb3aa1457.png)

*MixVio illustrative card: Preserve · Action · Lens · Pacing — our_generated structure graphic for lock-frame motion briefs.*

Most Image-to-Video drift is a prompt problem dressed up as a model problem. Creators re-describe the whole scene every take, then wonder why identity slips. A **motion brief** fixes that: lock the still first, then describe only what changes.

This is a builder checklist for MixVio Image-to-Video — Preserve / Action / Lens / Pacing — not a beginner upload walkthrough and not a credits protocol. Specs match MixVio tool and model pages (checked 2026-11-02). **Read the live quote before every Generate.**

## Preconditions: the still is already a contract

Before you write motion language:

1. Own a JPEG / PNG / WebP keyframe or storyboard still you may animate.
2. Optional MixVio helpers — **AI Image Generator** or **Image to Image** — can supply a board frame when needed. They are optional, not a required single-model pipeline.
3. Prefer **Image-to-Video** once composition and identity are locked. Text-to-Video invents a new scene; Reference-to-Video helps with several refs.

**Consistency gate (must be green):** silhouette · face/product angle · materials/logo · light direction · background anchors. Anything that must survive goes under **Preserve**.

On [MixVio home](https://mixvio.ai/?utm_source=hashnode&utm_medium=article&utm_campaign=viddo-storyboard-lock-frame-remix&utm_content=viddo-storyboard-lock-frame-remix-hashnode-intro) that contract sits in a multi-model workspace — keep one owned still; swap catalog routes later if you want a different motion personality on the same board.

## The four-line motion brief

Do **not** re-paint the still in words. Fill four fields:

| Field | Job | Example |
|---|---|---|
| **Preserve** | Identity that must survive | bottle silhouette, green band, desk light |
| **Action** | The one motion | steam rises once |
| **Lens** | Motivated camera | locked camera / very slow push-in |
| **Pacing** | Tempo + length intent | slow ease; 5s test first |

A Markdown table is fine on Hashnode for a builder checklist (Medium forbids MD tables; this platform does not).

**Weak briefs:** “Make this cinematic.” / “Animate the whole scene dramatically.”

**Stronger briefs:**
- “Preserve bottle silhouette, green band, and desk light; only steam rises once; locked camera; slow ease; 5s test.”
- “Keep logo readable and face angle; hand lifts the cup once; very slow push-in; no whip pans.”
- “Hold composition; cloth settles; soft daylight unchanged; short take.”

## Why one variable per take

If you change Action and Lens together, you cannot tell which broke the lock. Production iteration is boring on purpose:

1. Upload the locked still once.
2. Paste Preserve / Action / Lens / Pacing as the motion prompt.
3. Start **short + lower-res** — prove the lock.
4. Change **one** field per take (Action *or* Lens *or* Pacing).
5. Keep the take that honors Preserve; discard drift.

Reject random zooms. Every camera move needs a reason — that is **motivated camera**, not “cinematic” as a synonym for noise.

## Run it in the MixVio workspace

Open the [motion-brief I2V desk](https://mixvio.ai/tools/image-to-video?utm_source=hashnode&utm_medium=article&utm_campaign=viddo-storyboard-lock-frame-remix&utm_content=viddo-storyboard-lock-frame-remix-hashnode-inline#effect-workspace) in **Chrome**. Prefill spends nothing until Generate. Keep one job on that single board while you compare catalog routes.

![MixVio workspace live credit quote example](https://cdn.hashnode.com/uploads/gql/6ac7155f8cadc38d9e483af7/cdffdcde-b83b-4af2-bd6a-bb0eb34bbdd7.png)

*MixVio workspace capture: live Generate quote area (signed-in UI still; digits in-frame are a past quote example and may differ from current model-page anchors) — confirm your own reservation before Generate.*

Useful MixVio route hints when the brief is stable (selection copy — not a ranked league):

- **Seedance 2.5** — longer single takes (about **4–30s**).
- **Seedance 2.0** — subject lock toward **1080p–4K** on Standard.
- **Kling 4.0** — larger camera or subject action when the lock still holds.
- **MiniMax H3** (Hailuo 3.0) — first/last-frame style control when supported.
- **Veo 3.1 / Veo 3.1 Fast** — short polished beats (**4 / 6 / 8s**).
- **Gemini Omni Flash** — lower-credit motion proofs before you spend up.

## Model-page anchors (examples only)

- **Seedance 2.0** — Mini 4s · 480p = **5**; Standard from **19**; Standard 5s · 720p = **49**; Standard 5s · 1080p = **118**.
- **Seedance 2.5** — 4s · 480p = **27**.
- **Kling 4.0** — default 5s · 720p = **43**.
- **MiniMax H3** — default 5s · 768p = **8**; **Veo 3.1 Fast** 720p = **10**; **Gemini Omni Flash** from **15**.

Duration headroom reminder: most public I2V routes about **3–15s**; Seedance 2.5 about **4–30s**; Veo **4 / 6 / 8s**; Kling 4.0 whole seconds **3–30**. Exact chips live in the generator.

Vendor background: [Kling 4.0 user guide](https://kling.ai/quickstart/kling-4-model-user-guide) · [Seedance 2.5](https://seed.bytedance.com/en/seedance2_5). MixVio limits and the live reservation win.

Failed or safety-cancelled runs **release the reservation** on MixVio’s pricing page (Kling’s “return reserved credits” is compatible). Free-plan video is evaluation-only; paid may be commercial under ToS + provider rules when you have rights. Uploads stay private workspace assets.

## Checklist you can paste

```
[ ] Still owned + rights OK (JPEG/PNG/WebP)
[ ] Consistency gate green (silhouette / face / materials / light / bg)
[ ] Preserve filled (identity only)
[ ] Action = one motion
[ ] Lens motivated (no random zooms)
[ ] Pacing = short test first
[ ] Live quote read before Generate
[ ] One variable changed if re-running
```

## Bottom line

A motion brief turns Image-to-Video from lucky re-prompting into a production loop: lock the still, write Preserve / Action / Lens / Pacing, iterate one variable at a time, and **read the live quote**. When you want to run that checklist on your own keyframe, [Run the motion brief on MixVio](https://mixvio.ai/tools/image-to-video?utm_source=hashnode&utm_medium=article&utm_campaign=viddo-storyboard-lock-frame-remix&utm_content=viddo-storyboard-lock-frame-remix-hashnode-cta#effect-workspace).