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POST
/
v3
/
async
/
seedance-v1.5-pro-i2v
Seedance 1.5 Pro Image To Video
curl --request POST \
  --url https://api.myrouter.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
}
'
{
  "id": "<string>"
}
This is an async API that returns a task_id. Use the task_id to call the Get Async Task Result API to retrieve the video generation result. Supports text-to-video, image-to-video (first frame), and image-to-video (first and last frame) generation.
This is an async API that only returns the task_id of the async task. Use the task_id to call the Get Async Task Result API to retrieve the generated result.

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Request Headers

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Content-Type
string
required
Enum: application/json
​
Authorization
string
required
Bearer authentication format: Bearer {{API Key}}.

​
Request Body

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fps
integer
default:24
Frame rate (frames per second). Only 24 fps is supported.Possible values: 24
​
seed
integer
Seed integer for controlling randomness. Range: [-1, 2^32-1]. -1 means random seed. The same seed with the same request produces similar (but not identical) results.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/<format>;base64,<encoded_data>. 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 optimal ratio based on the prompt; for image-to-video, the ratio is automatically selected based on the uploaded first frame image.Possible values: 16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive
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prompt
string
required
Text prompt describing the expected video content. Supports both Chinese and English. Recommended to be no more than 500 characters. To generate audio with dialogue, place spoken content in double quotes for better audio generation results.
​
duration
integer
default:5
Video duration in seconds. Supports specified durations within the [4, 12] range. Note: Duration affects billing.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 yet supported).Possible 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 (results are 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 quotas, suitable for latency-sensitive scenarios. ‘flex’: offline inference mode with higher TPD quota at 50% of the online mode price, suitable for latency-insensitive scenarios.Possible values: default, flex
​
generate_audio
boolean
default:true
Whether the generated video includes synchronized audio. true: the video includes automatically generated speech, sound effects, and background music based on the prompt and visual content. false: outputs a 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’.Range: [3600, 259200]

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Response

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id
string
Video generation task ID. Use this ID to call the Get Async Task Result API to check the task status and retrieve the generated video URL upon success.