Seedance 2.0 V2V

[Core Function] Seedance 2.0 V2V is ByteDance’s flagship multimodal video-to-video model. [Strengths] It allows powerful editing and stylization of input videos by supporting mixed references (text, images, video, and audio) and producing multi-shot 15s outputs. [Best For] Highly recommended for: complex video-to-video transformations, restyling existing footage, and creating dynamic multi-shot edits. [Limitations] Do NOT use this model for simple still-image generation (use Seedream instead). [Routing] Use this model by default for any video editing or video-to-video generation tasks.

POST /bytedance/seedance-2.0-v2v

cURL

multimodal

curl --request POST \
  --url https://api.modellix.ai/api/v1/bytedance/seedance-2.0-v2v \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "video_urls": [
    "https://example.com/ref.mp4"
  ]
}
'

200

{
  "code": 0,
  "message": "success",
  "data": {
    "status": "pending",
    "task_id": "task-abc123",
    "model_id": "model-123",
    "get_result": {
      "method": "GET",
      "url": "https://api.modellix.ai/api/v1/tasks/task-abc123"
    }
  }
}

Authorizations

Authorization · string · header · required

API Key authentication. Format: Bearer YOUR_API_KEY.

Body

application/json

Seedance 2.0 video-to-video request. Official supported combinations are cumulative (not mutually exclusive): video_urls is always required; optionally add prompt, reference_images, and/or audio_urls. First/last frame parameters are not supported on V2V.

video_urls · string[] · required

Required. One to three reference video URLs.

Required array length: 1 - 3 elements

Video URL.

Minimum string length: 1

prompt · string

Optional. Video description. Maximum 10000 characters. Use [Image n], [Video n], and [Audio n] placeholders when referencing optional inputs. Recommended prompt length: under 1000 words.

Required string length: 1 - 10000

reference_images · string[]

Optional. Up to 9 reference image URLs for style or content guidance. Use [Image n] placeholders in prompt.

Required array length: 1 - 9 elements

Image URL or Base64 data.

Minimum string length: 1

audio_urls · string[]

Optional. Up to 3 reference audio URLs. Use [Audio n] placeholders in prompt.

Required array length: 1 - 3 elements

Audio URL.

Minimum string length: 1

ratio · enum<string> · default: adaptive

Aspect ratio of the generated video.

Available options: 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive

resolution · enum<string> · default: 720p

Output resolution of the video.

Available options: 480p, 720p, 1080p, 4k

duration · enum<integer> · default: 5

Video duration in seconds (4-15 seconds).

Available options: 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

seed · integer · default: -1

Random seed for reproducible generation. Use -1 for random.

Required range: -1 <= x <= 4294967295

camera_fixed · boolean · default: false

Whether to keep the camera fixed during generation.

generate_audio · boolean · default: true

Whether to generate audio.

execution_expires_after · integer · default: 172800

Task expiration time in seconds.

Required range: 3600 <= x <= 259200

return_last_frame · boolean · default: false

Whether to return the last frame of the generated video.

Response

200 - application/json

Task submitted successfully

code · integer · required

Response code, 0 indicates success

Example:

0

message · string · required

Response message

Example:

"success"

data · object · required

Detailed data about the submitted asynchronous task.

Show child attributes