How to Use the Vidu Q4 Preview Reference to Video API: reference to video integration guide (2026)

Vidu Q4 Preview Reference to Video is a reference to video model by Vidu: Generate a 3–16 second video from a prompt with optional references: up to 15 images and 3 audio clips. Supports aspect ratio selection, audio generation and 540p–4k resolution. On NamiFusion you can try it in the playground (exact quote shown before you submit), then call it through one unified REST API — about $0.475 per typical run.

TL;DR

· Task type: reference to video, provided by Vidu

· Pricing: about $0.475 per typical run ($1 = 100 credits), pay-as-you-go

· Getting started: playground (exact quote before submit) → create an API key → one POST request

· Tunable parameters: 8 (see the table below)

· No platform watermark; commercial use allowed (per the Terms of Service)

What can you build with Vidu Q4 Preview Reference to Video?

Short-form video and ad clips: go from a prompt or a single image to publishable motion content.

Product demos and concept previews: validate storyboards and visual direction cheaply before any shoot.

A social content factory: batch vertical clips and ride trending topics fast.

Remixing existing assets: image-to-video brings static work to life and extends its lifespan.

How do you call this API?

1. Sign up on NamiFusion and create a key on the API Keys page (signup bonus credits can only be used on selected models).
2. Submit a task with the cURL example below, passing your key as a Bearer token.
3. Poll the task status with the returned task_uuid and read the output URLs when completed.

# 1) Submit — returns { "task_uuid": "..." }
curl -X POST "https://www.namifusion.com/api/v1/marketplace/run/vidu/q4-preview/reference-to-video" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "input": {
    "prompt": "Create a polished cinematic product video featuring the same matte black wireless headphones from the reference images on a clean studio set. Start with a slow rotating close-up that highlights the soft ear cushions and brushed metal details, then transition to a lifestyle shot of a young adult placing the headphones on while warm ambient light glows in the background. Keep the subject design fully consistent with the references, use smooth camera motion, realistic reflections, shallow depth of field, premium commercial styling, and subtle motion graphics for a modern brand ad.",
    "images": [
      "https://d1s3annbwribom.cloudfront.net/marketplace/examples/2026/10/09/794a150611fc.jpeg",
      "https://d1s3annbwribom.cloudfront.net/marketplace/examples/2026/10/09/1612d26e4530.jpeg",
      "https://d1s3annbwribom.cloudfront.net/marketplace/examples/2026/10/09/87a14c8b9623.jpeg"
    ],
    "audios": [],
    "aspect_ratio": "16:9",
    "resolution": "720p",
    "duration": 5,
    "generate_audio": true,
    "seed": 123456
  }
}'

# 2) Poll until status is "completed", then read the output URLs
curl "https://www.namifusion.com/api/v1/marketplace/run/tasks/TASK_UUID" \
  -H "Authorization: Bearer YOUR_API_KEY"

What parameters does it take?

prompt (Prompt): required

images (Images): optional

audios (Audios): optional

aspect_ratio (Aspect Ratio): optional, default "16:9"

resolution (Resolution): optional, default "720p"

duration (Duration): optional, default 5

generate_audio (Generate Audio): optional, default true

seed (Seed): optional

How do you write prompts for Vidu Q4 Preview Reference to Video?

1. Subject first: lead with the actor and action, then add environment, lighting and style ("an astronaut sprinting through a neon street in the rain, cinematic, shallow depth of field").
2. Concrete nouns beat stacked adjectives: "85mm portrait lens, golden-hour backlight" works far better than "very beautiful, ultra high quality".
3. Change one variable per iteration: pin the seed to reproduce a result, tweak a single phrase at a time so you know what actually moved the output.
4. State negatives positively: instead of "no blur", ask for "sharp focus, crisp details".

How much does it cost?

Pay-per-use in credits. About $0.475 per typical run ($1 = 100 credits); the exact price varies with parameters like resolution or duration, and the playground shows the exact quote before you submit.