Motion Brief Checklist: Preserve, Action, Lens, Pacing

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 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:

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 in Chrome. Prefill spends nothing until Generate. Keep one job on that single board while you compare catalog routes.

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 · Seedance 2.5. 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.