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Generate videos using HappyHorse 1.1 with three modes: text-to-video, image-to-video (first frame), and reference-to-video (character consistency using reference images).

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Model

alibaba/happyhorse-1.1-video

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Modes

ModeDescription
t2vGenerate video from a text prompt
i2vGenerate video from a first frame image
r2vGenerate video from reference images. Use [Image N] in prompt to reference them (order matches reference_image_urls)

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Parameters

ParameterTypeRequiredDefaultDescription
modestringNo"t2v""t2v", "i2v", or "r2v"
promptstringNo""Text prompt describing the desired video
first_frame_urlstringNonullURL of the first frame image for I2V mode
reference_image_urlsstring[]NonullReference image URLs for R2V mode (1-9). Use [Image N] in prompt to reference them
ratiostringNonullAspect ratio (T2V/R2V only): "16:9", "9:16", "1:1", "4:3", "3:4", "4:5", "5:4", "9:21", "21:9"
resolutionstringNo"1080P""720P" or "1080P"
durationintegerNo5Output duration in seconds (3-15)
watermarkbooleanNofalseAdd watermark to the output
seedintegerNonullRandom seed for reproducible generation (0-2147483647)

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Example - Text-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "alibaba/happyhorse-1.1-video",
    "input": {
      "mode": "t2v",
      "prompt": "A golden retriever running through a field of wildflowers at sunset",
      "resolution": "1080P",
      "ratio": "16:9",
      "duration": 5
    }
  }'

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Example - Image-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "alibaba/happyhorse-1.1-video",
    "input": {
      "mode": "i2v",
      "prompt": "The camera slowly zooms out as the scene comes to life",
      "first_frame_url": "https://example.com/landscape.png",
      "resolution": "1080P",
      "duration": 10
    }
  }'

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Example - Reference-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "alibaba/happyhorse-1.1-video",
    "input": {
      "mode": "r2v",
      "prompt": "[Image 1] walks confidently through a busy city street",
      "reference_image_urls": ["https://example.com/person.png"],
      "resolution": "1080P",
      "ratio": "16:9",
      "duration": 8
    }
  }'

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Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "pending"
  }
}