Seedance 2.5 — Video extend API

← Seedance 2.5 Endpoint: POST https://api.higgsfield.ai/bytedance/seedance-2.5/video-extend Endpoint ID: bytedance/seedance-2.5/video-extend ▶Open API PlaygroundSeedance 2.5 · Video extend↗

Usage notes

Use publicly accessible media URLs; asset:// references are rejected for these endpoints.
The source video_url counts toward the 10-video limit, so include at most 9 additional video_urls. At most 50 media items are accepted across the source video and all reference arrays.
Videos and audio may be trimmed or padded during preprocessing to fit their respective 30-second total budgets. Output framing follows the source video.
duration is an integer from 4 to 30 seconds, with default 5.

Quick start

Replace the example media URLs with publicly accessible URLs for your own files before submitting.

curl --request POST \
  --url https://api.higgsfield.ai/bytedance/seedance-2.5/video-extend \
  --header "Authorization: Key ${HF_API_KEY_ID}:${HF_API_KEY_SECRET}" \
  --header "Content-Type: application/json" \
  --header "Idempotency-Key: ${IDEMPOTENCY_KEY}" \
  --data '{
  "prompt": "A cinematic wide shot of ocean waves at sunset, with gentle camera movement.",
  "video_url": "https://example.com/input.mp4"
}'

import higgsfield_client

arguments = (
    {'prompt': 'A cinematic wide shot of ocean waves at sunset, with gentle camera '
               'movement.',
     'video_url': 'https://example.com/input.mp4'}
)
result = higgsfield_client.subscribe(
    "bytedance/seedance-2.5/video-extend",
    arguments=arguments,
)
print(result["video"]["url"])

import { config, higgsfield } from "@higgsfield/client/v2";

config({ credentials: process.env.HF_CREDENTIALS });

const result = await higgsfield.subscribe("bytedance/seedance-2.5/video-extend", {
  input:
    {
      "prompt": "A cinematic wide shot of ocean waves at sunset, with gentle camera movement.",
      "video_url": "https://example.com/input.mp4"
    },
  withPolling: true,
});

if (result.status === "completed") {
  console.log(result.video?.url);
}

Input schema

string

required

Write your prompt here Minimum characters: 1.

integer

default:"5"

Requested output duration in seconds. Minimum: 4. Maximum: 30.

string

required

Public URL of the source video. Format: uri.

array

Ordered public audio reference URLs. Minimum items: 1. Maximum items: 10. Each item: string. Format: uri.

array

Ordered public image reference URLs. Minimum items: 1. Maximum items: 30. Each item: string. Format: uri.

string

default:"720p"

Output resolution tier. Allowed values: "480p", "720p", "1080p".

array

Ordered public video reference URLs. Minimum items: 1. Maximum items: 10. Each item: string. Format: uri.

string

default:"high"

Allowed values: "standard", "high".

boolean

default:"true"

Generate audio with the video.

Complete JSON schema

{
  "type": "object",
  "required": [
    "prompt",
    "video_url"
  ],
  "properties": {
    "prompt": {
      "type": "string",
      "minLength": 1,
      "description": "Write your prompt here"
    },
    "duration": {
      "type": "integer",
      "default": 5,
      "maximum": 30,
      "minimum": 4
    },
    "video_url": {
      "type": "string",
      "format": "uri"
    },
    "audio_urls": {
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri"
      },
      "maxItems": 10,
      "minItems": 1
    },
    "image_urls": {
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri"
      },
      "maxItems": 30,
      "minItems": 1
    },
    "resolution": {
      "enum": [
        "480p",
        "720p",
        "1080p"
      ],
      "type": "string",
      "default": "720p"
    },
    "video_urls": {
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri"
      },
      "maxItems": 10,
      "minItems": 1
    },
    "bitrate_mode": {
      "enum": [
        "standard",
        "high"
      ],
      "type": "string",
      "default": "high"
    },
    "generate_audio": {
      "type": "boolean",
      "default": true
    }
  },
  "additionalProperties": false
}

Response

Submission returns a request handle. Poll status_url until status is completed, or use webhooks.

Accepted

{
  "status": "queued",
  "request_id": "REQUEST_ID",
  "status_url": "https://api.higgsfield.ai/requests/REQUEST_ID/status",
  "cancel_url": "https://api.higgsfield.ai/requests/REQUEST_ID/cancel"
}

A completed response includes the following output fields:

{
  "status": "completed",
  "request_id": "REQUEST_ID",
  "video": {
    "url": "https://example.com/output.mp4"
  }
}

See idempotent requests, polling, request errors and authentication for shared request handling.

Requests

Models

Seedance 2.5 — Video extend API

Usage notes

Quick start

Input schema

Response

​Usage notes

​Quick start

​Input schema

​Response

Usage notes

Quick start

Input schema

Response