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Generate videos using ByteDance SeeDance 2.0 Fast Low Restriction. This variant allows face usage and is less restricted and moderated than the standard SeeDance 2.0 Fast model. Supports text-to-video, image-to-video, reference-guided, and video-to-video generation at 480p, 720p, or 1080p with synchronized audio.

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Model

bytedance/seedance-2.0-fast-low-restriction
This model allows face usage and applies reduced content moderation. Safety checking can be tuned with the safety_check and safety_mode parameters.

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Parameters

ParameterTypeRequiredDefaultDescription
promptstringYes—Text prompt describing the video to generate (2–3000 characters).
aspect_ratiostringNo—Output aspect ratio. One of 16:9, 4:3, 1:1, 3:4, 9:16, 21:9. Ignored for video-to-video (matches source video).
audiobooleanNo—Generate synchronized audio.
audio_urlsstring[]No—Reference audio(s) for audio-to-video (max 3). Requires video_urls or reference_image_urls.
durationinteger | stringNo—Video length in seconds (4–15) or "auto".
end_frame_image_urlstringNonullOptional last frame image (requires start_frame_image_url).
reference_image_urlsstring[]No—Reference image(s) for visual/style guidance (max 9).
resolutionstringNo—Output resolution preset. One of 480p, 720p, 1080p (1080p is seedance-2.0 only).
safety_checkbooleanNo—Enable content safety checking.
safety_modestringNo—Safety checking depth when enabled. One of none, fast (key frames), full (all).
start_frame_image_urlstringNonullStart frame image for image-to-video. Cannot be combined with video_urls, reference_image_urls, or audio_urls.
video_urlsstring[]No—Reference video(s) (URL) for video-to-video (max 3).

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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": "bytedance/seedance-2.0-fast-low-restriction",
    "input": {
      "prompt": "A drone shot flying over a neon-lit cyberpunk city at night",
      "aspect_ratio": "16:9",
      "duration": 5,
      "audio": true
    }
  }'

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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": "bytedance/seedance-2.0-fast-low-restriction",
    "input": {
      "prompt": "Smooth camera pan from left to right",
      "duration": 8,
      "start_frame_image_url": "https://example.com/start.jpg",
      "end_frame_image_url": "https://example.com/end.jpg"
    }
  }'

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Example - Reference-Guided

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedance-2.0-fast-low-restriction",
    "input": {
      "prompt": "A character animated with natural movement matching the references",
      "duration": 8,
      "reference_image_urls": [
        "https://example.com/scenery.jpg",
        "https://example.com/style.jpg"
      ]
    }
  }'

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Example - Video-to-Video

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedance-2.0-fast-low-restriction",
    "input": {
      "prompt": "Transform the background to match a sunset scenery",
      "duration": "auto",
      "video_urls": [
        "https://example.com/clip.mp4"
      ]
    }
  }'

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Response

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