API reference · ByteDance

bytedance/seedance/2.5/reference-to-video

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VIDEOAsyncOpen model

Production endpoint

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OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDbytedance/seedance/2.5/reference-to-video

Input Schema

12 parameters · 0 required · 12 optional

Parameter	Type	Required	Description
`seed`	integer	Optional	Random seed for reproducible results. Omit or use -1 for a random seed. · Min: -1 · Max: 4294967295
`draft`	boolean	Optional	Draft mode step 1: render a fast, low-cost 480p draft (overrides `resolution`, billed at the 480p rate). Pass the result's `outputs[0].draft_id` back as `draft_id` within 7 days to render the same shot at 1080p. · Default: false
`audios`	string[]	Optional	The URLs of reference audio files to guide video generation.
`images`	string[]	Optional	The URLs of reference images to guide video generation. Refer to them in the prompt as @Image1, @Image2, etc.
`prompt`	string	Optional	The text prompt to generate a video from. · Min length: 3 · Max length: 50000 · Default: "Use Image1 as the visual reference and Video1 as the motion reference. Create a peaceful cinematic shoreline scene with rolling ocean waves at golden hour, soft foam, natural water movement, and no people."
`videos`	string[]	Optional	The URLs of reference videos to guide video generation. Up to 10 MP4 or MOV files; combined duration must not exceed 30 seconds.
`draft_id`	string	Optional	Draft mode step 2: the `outputs[0].draft_id` of a succeeded draft from this same model (created with `draft: true` in the last 7 days). Renders the same shot at 1080p, billed at the 1080p rate for the actual output length. The prompt, media, duration, aspect ratio, seed, audio setting and task type are reused from the draft; any such fields sent with `draft_id` are ignored. · Min length: 1
`duration`	any	Optional	Output duration in seconds (4-30), or `auto` to let the model pick a length from the prompt and inputs. `auto` is pre-authorized at 30 seconds and billed on the actual output length. When a reference video is edited or extended, use `auto` with `adaptive` aspect ratio so the output follows the source clip. · Options: auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 · Default: 5 auto456789101112131415161718192021222324252627282930
`task_type`	string	Optional	`reference` generates a new video from the references, `edit` edits a reference video (replace subjects, add or remove objects, repaint), `extend` extends a reference video forward or backward, `auto` (or omitted) lets the model infer it from the prompt. `edit` and `extend` require at least one video; `edit` forces `adaptive` aspect ratio and `auto` duration, `extend` forces `adaptive` aspect ratio. Write the prompt to match, otherwise the task can fail with a task-type mismatch. · Options: auto, reference, edit, extend autoreferenceeditextend
`resolution`	string	Optional	The resolution of the video to generate. · Options: 480p, 720p, 1080p · Default: "720p" 480p720p1080p
`aspect_ratio`	string	Optional	Output aspect ratio. Omit to let the model choose from the prompt and reference inputs. · Options: 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, adaptive 16:99:161:14:33:421:9adaptive
`generate_audio`	boolean	Optional	Whether to generate synchronized audio (voice, SFX, BGM) for the video. · Default: true

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

const apiKey = process.env.SANDBASE_API_KEY;
const response = await fetch("https://api.sandbase.ai/v1/run", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "bytedance/seedance/2.5/reference-to-video",
    "draft": false,
    "images": [
      "https://static.sandbase.ai/examples/bytedance/seedance/2.0/reference-to-video/input_image_safe_ocean_0.jpg"
    ],
    "prompt": "Use Image1 as the visual reference and Video1 as the motion reference. Create a peaceful cinematic shoreline scene with rolling ocean waves at golden hour, soft foam, natural water movement, and no people.",
    "videos": [
      "https://static.sandbase.ai/examples/pixverse/sound-effects/input_video_0.mp4"
    ],
    "duration": 5,
    "resolution": "720p",
    "generate_audio": true
  }),
});

if (!response.ok) throw new Error(await response.text());
let result = await response.json();
for (let attempt = 0; attempt < 120 && !["completed", "failed", "timeout"].includes(result.status); attempt++) {
  await new Promise((resolve) => setTimeout(resolve, 2_000));
  const poll = await fetch(`https://api.sandbase.ai/v1/run/${result.id}`, {
    headers: { Authorization: `Bearer ${apiKey}` },
  });
  if (!poll.ok) throw new Error(await poll.text());
  result = await poll.json();
}
if (result.status !== "completed") throw new Error(`Generation ended: ${result.status}`);
console.log(result);

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