seedance-video

Seedance Video Generation

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

Setup: See authentication 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. 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 2.0 (current generation — multimodal reference)

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

Model	Best For	Max resolution
doubao-seedance-2-0-260128	Highest quality, real-person/character reference, 4k output	4k
doubao-seedance-2-0-fast-260128	Faster 2.0 generation	720p
doubao-seedance-2-0-mini-260615	Lightweight / most cost-effective 2.0	720p

Seedance 1.x

Model	Type	Best For
doubao-seedance-1-5-pro-251215	Text+Image-to-Video	1.5 flagship, audio support
doubao-seedance-1-0-pro-250528	Text+Image-to-Video	General-purpose, reliable quality
doubao-seedance-1-0-pro-fast-251015	Text+Image-to-Video	Faster Pro generation
doubao-seedance-1-0-lite-t2v-250428	Text-to-Video only	Lightweight text-to-video
doubao-seedance-1-0-lite-i2v-250428	Image-to-Video only	Lightweight image-to-video

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 2.0 only):

• audio_url — reference audio for voice timbre / background music (no role)
• video_url — reference video for subject, camera movement, motion or overall style (no role)

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 image_url items with role: "reference_image" — 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 audio_url and/or video_url 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", "audio_url": {"url": "https://example.com/voice.mp3"}},
    {"type": "video_url", "video_url": {"url": "https://example.com/motion.mp4"}}
  ],
  "generate_audio": true
}

Parameters

Parameter	Values	Description
model	see Models table	Model to use (required)
content	array	Input items: text, image_url, audio_url (2.0), video_url (2.0) (required)
resolution	"480p", "720p", "1080p", "4k"	Output resolution. 4k is doubao-seedance-2-0-260128 (standard) only; 2-0-fast / 2-0-mini max out at 720p (default: 720p for pro/2.0, 480p for lite)
ratio	"16:9", "4:3", "1:1", "3:4", "9:16", "21:9", "adaptive"	Aspect ratio (default: 16:9)
duration	2 – 15	Duration in seconds (Seedance 2.0 supports 4–15)
frames	29–361 (must satisfy 25+4n)	Frame count — mutually exclusive with duration
seed	-1 to 4294967295	Seed for reproducible results (-1 = random)
generate_audio	true / false	Generate audio (supported by doubao-seedance-1-5-pro-251215 and the doubao-seedance-2-0 series; other models ignore it)
camerafixed	true / false	Fix the camera position during generation
watermark	true / false	Add a watermark to the generated video
return_last_frame	true / false	Return the last frame of the generated video
service_tier	"default", "flex"	Processing tier (default: default)
execution_expires_after	number	Task timeout threshold in seconds

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
• first_frame and last_frame may be combined in one request, but reference_image is mutually exclusive with first_frame / 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
• audio_url and video_url reference items are used by the Seedance 2.0 series only
• 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
• service_tier values are "default" and "flex" (not "standard"/"premium")
• Duration range is 2–15 seconds (Seedance 2.0 supports 4–15) — values outside this range will fail
• 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