Video

Seedance 1.5 Pro video

Seedance 1.5 Pro — start + last frame. 4s/8s/12s. 480p/720p/1080p.

Category: Create · seedance-1-5-pro

How to use & limits

Text-to-video and image-to-video (first/last frame) modes.
prompt: 3–2,500 characters.
image_urls: up to 2 images — index 0 = start frame, index 1 = end frame; JPEG/PNG/WebP, up to 10MB each.
Fixed duration: 4, 8 or 12 seconds.
Resolution: 480p, 720p or 1080p.
Optional audio (generate_audio) and locked lens (fixed_lens).

Capabilities

What this model supports, straight from the schema — no pricing, no infrastructure detail.

Capability	Value
`fixed_lens` Fixed lens	Yes
`text_to_video` Text-to-video	Yes
`image_to_video` Image-to-video	Yes
`audio_generation` Audio generation	Yes
`first_last_frame` First + last frame	Yes

Parameters

Fields accepted in params (or first-class, where applicable) for POST /generations.

Name	Label	Type	Required	Default	Options	Min / Max	Description
`prompt`	Prompt	textarea	Required	—	—	—	Video description, 3 to 2,500 characters.
`image_urls`	Image references	multi_select	Optional	—	—	— – 2	Up to 2 images: index 0 = start frame, index 1 = end frame (JPEG/PNG/WebP, up to 10MB).
`resolution`	Resolution	select	Optional	720p	480p · 720p · 1080p	—	Output resolution: 480p, 720p or 1080p.
`duration`	Duration	select	Required	4	—	—	Fixed duration in seconds: 4, 8 or 12.
`fixed_lens`	Fixed lens	boolean	Optional	false	—	—	Locks the camera lens for steady framing.
`generate_audio`	Generate audio	boolean	Optional	false	—	—	Generates an audio track with the video.
`negative_prompt`	Negative prompt	textarea	Optional	—	—	—	—
`aspect_ratio`	Aspect ratio	select	Required	16:9	1:1 · 21:9 · 4:3 · 3:4 · 16:9 · 9:16	—	Aspect ratio: 1:1, 21:9, 4:3, 3:4, 16:9 or 9:16.

Example request

bash

curl -X POST https://caranguejo.art/api/v1/dev/generations \
  -H "Authorization: Bearer $CK" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seedance-1-5-pro",
  "prompt": "Slow zoom over a futuristic city at sunset, cinematic lighting.",
  "params": {
    "resolution": "720p",
    "duration": 4,
    "aspect_ratio": "16:9",
    "generate_audio": true
  }
}'

javascript

const res = await fetch("https://caranguejo.art/api/v1/dev/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer " + process.env.CK,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "seedance-1-5-pro",
    "prompt": "Slow zoom over a futuristic city at sunset, cinematic lighting.",
    "params": {
      "resolution": "720p",
      "duration": 4,
      "aspect_ratio": "16:9",
      "generate_audio": true
    }
  }),
});
const { data } = await res.json();

Example response

json

{
  "id": "9f0c1a7e-…",
  "object": "generation",
  "model": "seedance-1-5-pro",
  "type": "video",
  "status": "completed",
  "output": {
    "assets": [
      {
        "url": "https://media.caranguejo.art/outputs/example.mp4",
        "type": "video"
      }
    ]
  }
}

The job's real cost is returned as credits_charged on the completed response — check GET /balance for the account balance.

Common errors for this job type:

`insufficient_credits`	Account balance can't cover the job cost.
`content_policy_violation`	Prompt or media rejected by content policy.
`generation_timeout`	The job exceeded the maximum processing time.
`rate_limited`	Too many requests per minute.
`invalid_input`	A required parameter is missing or outside the model's schema.
`generation_failed`	Generic processing failure.