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POST
https://api.novita.ai
/
v3
/
async
/
seedance-v1.5-pro-i2v
Seedance 1.5 Pro Image To Video
curl --request POST \
  --url https://api.novita.ai/v3/async/seedance-v1.5-pro-i2v \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "fps": 123,
  "seed": 123,
  "image": "<string>",
  "ratio": "<string>",
  "prompt": "<string>",
  "duration": 123,
  "watermark": true,
  "last_image": "<string>",
  "resolution": "<string>",
  "camera_fixed": true,
  "service_tier": "<string>",
  "generate_audio": true,
  "execution_expires_after": 123
}
'
{
  "task_id": "<string>"
}
Seedance 1.5 pro Image to Video API.
This is an asynchronous API; only the task_id will be returned. You should use the task_id to request the Task Result API to retrieve the video generation results.

​
Request Headers

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Content-Type
string
required
Supports: application/json
​
Authorization
string
required
Bearer authentication format, for example: Bearer {{API Key}}.

​
Request Body

​
fps
integer
default:24
Frame rate (frames per second). Only 24 fps is supported.Optional values: 24
​
seed
integer
Seed integer for controlling randomness. Range: [-1, 2^32-1]. -1 means using a random seed. The same seed with the same request produces similar (but not identical) results.Value range: [-1, 4294967295]
​
image
string
required
The first frame image for image-to-video generation. Can be an image URL or Base64-encoded image. URL must be accessible. Base64 format: data:image/<image format>;base64,<Base64 encoding>. Supported formats: jpeg, png, webp, bmp, tiff, gif. Aspect ratio: (0.4, 2.5), dimensions: (300, 6000) pixels, size: < 30 MB.
​
ratio
string
default:"adaptive"
Aspect ratio of the generated video. ‘adaptive’: For text-to-video, the model intelligently selects the best ratio based on the prompt; for image-to-video, it automatically selects based on the uploaded first frame image ratio.Optional values: 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive
​
prompt
string
required
Text prompt describing the expected video content. Supports both Chinese and English. Recommended not to exceed 500 characters. To generate audio with dialogue, place the spoken content within double quotes for better audio generation results.
​
duration
integer
default:5
Video duration in seconds. Supports specified duration within the range [4, 12]. Note: Duration affects billing.Value range: [4, 12]
​
watermark
boolean
default:false
Whether the generated video includes a watermark. true: with watermark. false: without watermark.
​
last_image
string
The last frame image for first-and-last-frame image-to-video generation. Can be an image URL or Base64-encoded image. Requirements are the same as the image field. When aspect ratios differ, the last frame will be automatically cropped to match the first frame.
​
resolution
string
default:"720p"
Video resolution. Seedance 1.5 pro supports 480p and 720p (1080p is not currently supported).Optional values: 480p, 720p
​
camera_fixed
boolean
default:false
Whether to fix the camera position. true: The platform appends a fixed camera instruction to the prompt (effect not guaranteed). false: Camera is not fixed.
​
service_tier
string
default:"default"
Service tier for processing the request. ‘default’: Online inference mode with lower RPM and concurrency quota, suitable for time-sensitive scenarios. ‘flex’: Offline inference mode with higher TPD quota at 50% of the online mode price, suitable for latency-insensitive scenarios.Optional values: default, flex
​
generate_audio
boolean
default:true
Whether the generated video includes synchronized audio. true: Video includes automatically generated speech, sound effects, and background music based on the prompt and visual content. false: Output silent video.
​
execution_expires_after
integer
default:172800
Task timeout threshold in seconds, calculated from the created_at timestamp. Default: 172800 (48 hours). Range: [3600, 259200]. Tasks exceeding this time will be automatically terminated and marked as ‘expired’.Value range: [3600, 259200]

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Response

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task_id
string
required
Use the task_id to request the Task Result API to retrieve the generated outputs.