Seedance Video Generation

Generate AI dance and motion videos through AceDataCloud's Seedance (ByteDance) API.

Setup: See [authentication](../_shared/authentication.md) for token setup.

Quick Start

curl -X POST https://api.acedata.cloud/seedance/videos \
  -H "Authorization: Bearer $ACEDATACLOUD_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"model": "doubao-seedance-2-0-260128", "content": [{"type": "text", "text": "a dancer performing contemporary ballet in a misty forest"}], "callback_url": "https://api.acedata.cloud/health"}'

Async: See [async task polling](../_shared/async-tasks.md). Poll via POST /seedance/tasks with {"id": "..."}.

This returns a task ID immediately. Poll for the result:

curl -X POST https://api.acedata.cloud/seedance/tasks \
  -H "Authorization: Bearer $ACEDATACLOUD_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"id": "<task_id from above>"}'

Models

Seedance 2.5 (latest flagship)

Use omnireferencetasktype: "auto", "edit", or "extend". Edit and extend require referencevideo and ratio: "adaptive"; edit also requires duration: -1. Optional output_format is mp4 or mov.

Seedance 2.0 (multimodal reference, up to 4k)

The 2.0 series adds multimodal reference inputs: real-person / character image references, reference audio, and reference video (see the workflows below).

Seedance 1.x

Workflows

1. Text-to-Video

Pass a text content item in the content array.

POST /seedance/videos
{
  "model": "doubao-seedance-1-0-pro-250528",
  "content": [
    {"type": "text", "text": "a street dancer doing breakdancing moves in an urban setting"}
  ],
  "resolution": "1080p",
  "ratio": "16:9",
  "duration": 5
}

2. Image-to-Video

Include an image content item (with an optional role) alongside the text.

POST /seedance/videos
{
  "model": "doubao-seedance-1-5-pro-251215",
  "content": [
    {"type": "text", "text": "the person starts dancing gracefully"},
    {
      "type": "image_url",
      "role": "first_frame",
      "image_url": {"url": "https://example.com/dancer.jpg"}
    }
  ],
  "resolution": "720p",
  "duration": 5
}

Image roles:

• first_frame — image is used as the opening frame
• last_frame — image is used as the closing frame
• reference_image — image is used as a style / subject / real-person reference (Seedance 2.0 keeps the referenced person or character consistent)

Reference media (Seedance 2.x):

• audiourl — use role: "referenceaudio"
• videourl — use role: "referencevideo"
• 2.5 accepts pure-audio reference; 2.0 requires an image or video alongside audio

3. First-frame + Last-frame

Provide both a start and end frame image:

POST /seedance/videos
{
  "model": "doubao-seedance-2-0-260128",
  "content": [
    {"type": "text", "text": "smooth transition between two scenes"},
    {"type": "image_url", "role": "first_frame", "image_url": {"url": "https://example.com/start.jpg"}},
    {"type": "image_url", "role": "last_frame", "image_url": {"url": "https://example.com/end.jpg"}}
  ]
}

4. Real-person / character reference (Seedance 2.0)

Seedance 2.0 models (doubao-seedance-2-0-260128, doubao-seedance-2-0-fast-260128, doubao-seedance-2-0-mini-260615) can keep a specific person or character consistent across a brand-new scene. Pass one or more photos as imageurl items with role: "referenceimage" — the model preserves that subject's appearance. Up to 9 reference images are accepted.

POST /seedance/videos
{
  "model": "doubao-seedance-2-0-260128",
  "content": [
    {"type": "text", "text": "the same person walking through a neon-lit night market, cinematic"},
    {"type": "image_url", "role": "reference_image", "image_url": {"url": "https://example.com/person.jpg"}}
  ],
  "resolution": "1080p",
  "duration": 8
}

5. Reference audio / video (Seedance 2.0)

2.0 models also accept reference audio (voice timbre, background music) and reference video (subject content, camera movement, motion, overall style). Add audiourl and/or videourl content items. Limits: up to 3 audio and 3 video references per request.

POST /seedance/videos
{
  "model": "doubao-seedance-2-0-260128",
  "content": [
    {"type": "text", "text": "a singer performing on stage, matching the reference voice and motion"},
    {"type": "image_url", "role": "reference_image", "image_url": {"url": "https://example.com/person.jpg"}},
    {"type": "audio_url", "role": "reference_audio", "audio_url": {"url": "https://example.com/voice.mp3"}},
    {"type": "video_url", "role": "reference_video", "video_url": {"url": "https://example.com/motion.mp4"}}
  ],
  "generate_audio": true
}

Parameters

Inline Parameter Syntax

You can also embed generation parameters directly in the text prompt using the --param value syntax:

A kitten yawning at the camera. --rs 720p --rt 16:9 --dur 5 --fps 24 --seed 42

Supported inline params: --rs (resolution), --rt (ratio), --dur (duration), --frames, --fps (24 only), --seed, --cf (camera_fixed), --wm (watermark).

Gotchas

• Model names use the doubao-* convention (e.g. doubao-seedance-1-0-pro-250528) — old short names like seedance-1.0 are not valid
• The content array replaces the old prompt + image_url fields; always use content
• Image and text scenarios are mutually exclusive per content item — each item has either text or image_url, not both
• firstframe and lastframe may be combined in one request, but referenceimage is mutually exclusive with firstframe / last_frame — do not mix a reference image with first/last frames
• generate_audio: true is supported by doubao-seedance-1-5-pro-251215 and the doubao-seedance-2-0 series; other models ignore this field
• Lite models are split: -lite-t2v- only accepts text, -lite-i2v- only accepts image-to-video
• audiourl and videourl reference items are supported by Seedance 2.0 and 2.5; 2.5 also supports pure-audio reference
• Resolution options are 480p, 720p, 1080p, and 4k (4k is doubao-seedance-2-0-260128 only; 2-0-fast / 2-0-mini max out at 720p) — there is no 360p or 540p
• Duration is model-specific: 1.0 supports 2–12; 1.5 Pro supports 4–12/-1; 2.0 supports 4–15/-1; 2.5 supports 4–30/-1
• Task states use "succeeded" (not "completed") — check for this value when polling

MCP: pip install mcp-seedance | Hosted: https://seedance.mcp.acedata.cloud/mcp | See [all MCP servers](../_shared/mcp-servers.md)