curl --request POST \
  --url https://api.vidgo.ai/api/generate/submit \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "blackforestlabs/flux-3/extend-video",
  "input": {
    "prompt": "A quiet forest under soft morning light, with natural detail.",
    "video_url": "https://example.com/video.mp4",
    "duration": 5,
    "resolution": "720p",
    "aspect_ratio": "auto",
    "sound": true
  }
}
'

{
  "code": 200,
  "data": {
    "task_id": "task-unified-example",
    "status": "running",
    "created_time": "2026-09-10T08:00:00"
  }
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

"Request timeout"

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

{
  "detail": "<string>"
}

​

FLUX 3 Extend Video

Continue an existing video with FLUX 3, using a text prompt to guide the next part of the scene with optional sound.

​

Available Models

• blackforestlabs/flux-3/extend-video - Continue an existing video with a prompt describing the next part of the scene.

​

Duration Options

• 5-20 seconds - Set duration as an integer. Default: 5 seconds.
• duration specifies the newly generated extension, not the length of the source video.

​

Key Features

• Continue an existing video with a prompt describing the next part of the scene.
• Choose from 720p, 1080p output resolutions.
• Control audio generation with sound; it defaults to true.

​

Advanced Parameters

Set model and optional callback_url at the request root. Place the parameters below inside input. Send only the input fields supported by this workflow. Unsupported input fields are rejected before credits are deducted. Input URLs must use HTTP(S), include a hostname, and contain no embedded credentials.

​

Prompt

• prompt: Required. Describe the scene and desired motion.
• The prompt must not be blank when supplied.

​

Source Video

• video_url: Required. Provide one publicly accessible source video URL.

​

Resolution

• resolution: 720p, 1080p. Default: 720p.

​

Aspect Ratio

• aspect_ratio: auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16. Default: auto.

​

Audio

• sound: Set to true to enable generated audio, or false to disable it. Default: true.

​

Pricing

Pricing depends on the selected model and applicable output settings. Check the Vidgo dashboard for the current rate. Credits are deducted on submission and refunded if the task fails.