Prompt LibraryPrompt Library / Before / After Transformation Video / for Mochi
Before / After Transformation Video Prompt for Mochi
This is the Mochi version of the before / after transformation video prompt: one locked-off shot that carries a subject from its before state to its after state — the change is the whole clip. It is formatted the way Mochi takes prompts best. Free — copy it, replace the bracketed parts, and paste it in.
The prompt
Push copies this prompt with a reference line naming your image, and downloads the image file — attach it in the model to complete the pair. This page stages the pair for you; it cannot upload into the model itself (sites cannot reach into each other), so the final attach happens there. The image is downscaled to at most 1024px and stored only in this browser, paired with this prompt. If browser storage is full, it is kept for this visit only.
The deliverable — and how to check it
Deliverable: one 10-second clip from a single locked-off camera position: the before state holds for the first 3 seconds, the transformation plays through the middle, the after state holds for the final 3 seconds, angle and framing identical throughout. Acceptance check: overlay the first and last frames — the frame edges must align exactly; any cut, reframing or light-direction change fails the clip.
Series: Music Video Production — Step 2 of 2 — the transformation set-piece. See its place in the full workflow
Using this prompt with Mochi
Mochi 1 (Genmo) is an open-weights (Apache-2.0) video model that takes long, highly descriptive, motion-focused prose: describe the movement itself in detail — speeds, directions, how bodies and fabrics move — because motion fidelity is its strength. It is text-to-video only: no image conditioning, so a keyframe cannot anchor it, and no audio. Output is 480p at about 84 frames per generation — treat it as a motion sketch and prototyping model, or an open pipeline component, rather than a finishing tool.
What this route costs — and how to pay less
Cost structure: open weights (Apache-2.0) — Mochi runs on your own hardware, so the marginal cost per generation is zero; Genmo also hosts a playground. The same prompt is pre-configured in this library for every major model, so you can run it on whichever route fits your budget — comparing the structures before you generate is a free way to save money.
Replace the bracketed placeholders — [SUBJECT], [BEFORE DESCRIPTION], [AFTER DESCRIPTION] — with your own details before pasting.
Other versions and customization
See all model versions of this prompt, or open the prompt gateway to build a custom prompt from your own one-line goal, formatted for Mochi or any other model.
More Mochi prompts
Mpromp2 — the AI Prompt Generator. Every prompt in this library is free to use, including commercially.