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POST
/
bytedance
/
seedance-1.5-pro-i2v
curl --request POST \
  --url https://api.modellix.ai/api/v1/bytedance/seedance-1.5-pro-i2v \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "first_frame_image": "https://example.com/image.jpg",
  "prompt": "The person smiles and waves"
}
'
{
  "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

At least one of first_frame_image or last_frame_image must be provided.

​
first_frame_image
string

URL or Base64 data for the first frame image.

Minimum string length: 1
Example:

"https://example.com/first.jpg"

​
last_frame_image
string

URL or Base64 data for the last frame image.

Minimum string length: 1
Example:

"https://example.com/last.jpg"

​
prompt
string

Description of the desired output. Recommended prompt length: under 1000 words. Lengthy text will lead to scattered information, and the model may ignore details and only focus on key points, resulting in missing elements in the generated video.

Required string length: 1 - 10000
​
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
​
duration
enum<integer>
default:5

Video duration in seconds (4-12 seconds).

Available options:
4,
5,
6,
7,
8,
9,
10,
11,
12
​
seed
integer
default:-1

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

Required range: -1 <= x <= 2147483647
​
camera_fixed
boolean
default:false

Whether to keep the camera fixed during generation.

​
generate_audio
boolean
default:true

Whether to generate audio. 1.5 Pro exclusive feature.

​
service_tier
enum<string>
default:default

Service tier for generation (e.g., default or flex).

Available options:
default,
flex
​
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.