Generate professional dance videos using ByteDance SeeDance 1.5 Pro with start and end frame support, 7 aspect ratios, and optional audio generation.

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Model

bytedance/seedance-1.5-pro

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Parameters

ParameterTypeRequiredDescription
promptstringYesText description of the dance
start_image_urlstringYesStarting frame image URL
end_image_urlstringNoEnding frame image URL
aspect_ratiostringNoauto, 1:1, 3:4, 4:3, 9:16, 16:9, 21:9
resolutionstringNo480p, 720p, or 1080p (default: 720p)
durationintegerNo4, 8, or 12 seconds (default: 4)
generate_audiobooleanNoGenerate audio (default: false)
fixed_lensbooleanNoUse fixed camera lens (default: false)
seedintegerNoSeed for reproducibility

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Aspect Ratios

ValueDescription
autoAutomatically determined
1:1Square
3:4Portrait
4:3Landscape
9:16Vertical/mobile
16:9Widescreen
21:9Ultra-wide

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Example - Basic

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedance-1.5-pro",
    "input": {
      "prompt": "Energetic dance performance",
      "start_image_url": "https://example.com/person.jpg",
      "duration": 8,
      "aspect_ratio": "9:16",
      "resolution": "1080p",
      "generate_audio": true
    }
  }'

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Example - With End Frame

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedance-1.5-pro",
    "input": {
      "prompt": "Smooth dance transition from standing to sitting",
      "start_image_url": "https://example.com/person-standing.jpg",
      "end_image_url": "https://example.com/person-sitting.jpg",
      "duration": 12,
      "aspect_ratio": "16:9",
      "resolution": "720p",
      "fixed_lens": true
    }
  }'

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Response

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

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Pricing

Audio OFF
Duration480p720p1080p
4s$0.04$0.06$0.12
8s$0.06$0.10$0.24
12s$0.08$0.16$0.36
Audio ON
Duration480p720p1080p
4s$0.06$0.10$0.24
8s$0.10$0.20$0.48
12s$0.16$0.30$0.72