How to Recast a Video With AI (Motion Transfer Guide)

Motion Transfer replaces the people in a clip with new characters while keeping every movement, head turn and camera move. The model does the heavy lifting, but a few choices before you press Generate make a big difference.

Step 1: Film a clip the model can read

• Length: 5–30 seconds, with no single shot longer than 15 seconds.
• Framing: keep the person clearly visible; avoid heavy motion blur and very dark scenes.
• One idea per clip: a single action — a dance phrase, a product demo, a walk-and-talk — transfers more cleanly than a busy montage.
• Format: MP4 or MOV up to 100MB. A normal phone recording is fine.

Step 2: Choose reference images

Add one reference image per character, in left-to-right order of the people in your clip.

• Use a clear, front-facing image with the whole character visible.
• Illustrated, cartoon and 3D characters work especially well.
• Only use real people if you have their permission — public figures and minors are not allowed.

Step 3: Write a short prompt (optional)

The prompt is optional for Motion Transfer, but it helps when your clip has more than one person or when something else should change. Say what must stay the same:

The person becomes the 3D mascot from the reference image. Keep every gesture and the handheld camera.

Replace the dancer with the anime character in the reference. Keep the choreography and timing exactly.

More copy-ready prompts are on the Genjutsu AI prompts page.

Step 4: Pick a resolution and generate

Choose 768p for drafts and 1080p for finals. You see the exact credit cost before you start; renders take a few minutes, and failed jobs are refunded automatically.

Common problems and fixes

Problem	Try this
The new character looks different from the reference	Use a cleaner, front-facing reference image
Wrong person was replaced	Order reference images left to right, or name who becomes whom in the prompt
Jittery result	Use a steadier source clip with less motion blur

Start recasting

Open the generator, choose Motion Transfer, and upload your clip. New accounts get free credits to try it.