Vidu Q4 Reference To Video

Endpoint

POST /videos/generations

Full URL: https://modelfold.ai/v1/videos/generations

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Send model parameters directly in the JSON body. Do not wrap them in input. This request waits for generation to finish and returns data[].url; supported media models also offer async jobs, polling and callbacks. Replace example media URLs with your own publicly accessible files. See API gateway for billing and errors.

Input parameters for the generation task.

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name used for generation. This endpoint must use vidu-q4/reference-to-video. Default："vidu-q4/reference-to-video"。 Allowed values：vidu-q4/reference-to-video。 Example：vidu-q4/reference-to-video。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Text description of the video. Refer to inputs by order, e.g. "the man in reference image 2 says ... using reference audio 1". Up to 20,000 characters. minLength: 1. maxLength: 2000.
duration	integer	No	Video length in seconds. Integer from 3 to 16. Default：5。 minimum: 3. maximum: 16. Example：5。
resolution	string	No	Output resolution. Default："720p"。 Allowed values：540p / 720p / 1080p / 2k / 4k。 Example：720p。
audio	boolean	No	Generate synchronized audio (dialogue and sound effects). Set false for a silent video. Default：true。 Example：true。
reference_image_urls	array<string>	Yes	Reference image URLs (http/https), 1 to 15. JPG, JPEG, PNG or WEBP. minItems: 1. maxItems: 15.
reference_audio_urls	array<string>	No	Optional reference audio URLs (http/https), up to 3. MP3 only, each 3-12 seconds and up to 50 MB. maxItems: 3.
aspect_ratio	string	No	Output aspect ratio. Default："16:9"。 Allowed values：16:9 / 9:16 / 1:1 / 4:3 / 3:4。 Example：16:9。

Request Example

curl -X POST "https://modelfold.ai/v1/videos/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "vidu-q4/reference-to-video",
  "prompt": "A paper boat drifting down a rainy street.",
  "reference_image_urls": [
    "https://example.com/reference.png"
  ],
  "duration": 5,
  "resolution": "720p",
  "audio": true,
  "aspect_ratio": "16:9"
}'

{
  "model": "vidu-q4/reference-to-video",
  "prompt": "A paper boat drifting down a rainy street.",
  "reference_image_urls": [
    "https://example.com/reference.png"
  ],
  "duration": 5,
  "resolution": "720p",
  "audio": true,
  "aspect_ratio": "16:9"
}

Response

200 — Generation completed. usage contains actual billing details; result URLs are illustrative.

{
  "ok": true,
  "created": 1792134000,
  "data": [
    {
      "url": "https://modelfold.ai/uploads/outputs/result.mp4"
    }
  ],
  "usage": {}
}