HappyHorse - video-edit

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 to use for generation. Required field. - Must be happyhorse/video-edit for this endpoint Default："happyhorse/video-edit"。 Allowed values：happyhorse/video-edit。 Example：happyhorse/video-edit。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Required edit instruction describing the intended change (e.g., style transfer / local replacement). Up to 5,000 characters. maxLength: 2000. Example：Make the horse-headed humanoid character in the video wear the striped sweater from the image。
video_url	string	Yes	URL of the input video (one video). Video requirements: Format: MP4, MOV (H.264 encoding recommended). Duration: 3–60 seconds. Resolution: the longer side must not exceed 2,160 px; the shorter side must be at least 320 px. Aspect ratio: 1:2.5–2.5:1. File size: up to 100 MB. Frame rate: greater than 8 fps.
reference_image	array<string>	No	Optional reference image URL list (0–5). Image requirements: Format: JPEG, JPG, PNG, WEBP. Resolution: both width and height must be at least 300 px. Aspect ratio: 1:2.5–2.5:1. File size: up to 10 MB. minItems: 0. maxItems: 5.
resolution	string	No	Output video resolution: 720p or 1080p (default). Default："1080p"。 Allowed values：720p / 1080p。 Example：1080p。
audio_setting	string	No	Audio handling: auto lets the model handle audio; origin keeps the input video's original audio where possible. Default："auto"。 Allowed values：auto / origin。 Example：auto。
seed	integer	No	Random seed for reproducibility. Default：0。 minimum: 0. maximum: 2147483647. Example：0。

Request Example

curl -X POST "https://modelfold.ai/v1/videos/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "happyhorse/video-edit",
  "prompt": "Make the horse-headed humanoid character in the video wear the striped sweater from the image",
  "video_url": "https://example.com/reference.mp4",
  "resolution": "1080p",
  "audio_setting": "auto",
  "seed": 0
}'

{
  "model": "happyhorse/video-edit",
  "prompt": "Make the horse-headed humanoid character in the video wear the striped sweater from the image",
  "video_url": "https://example.com/reference.mp4",
  "resolution": "1080p",
  "audio_setting": "auto",
  "seed": 0
}

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": {}
}