# seedance-2.5-intl-video-extend

> Seedance 2.5 Video Extend extends an input video with a new cinematic continuation generated from its last frame and a natural-language prompt. This international-region endpoint is served via Seegen's Dreamina-hosted deployment of the same Seedance 2.5 model, for traffic outside mainland China.

## Overview

- **Endpoint**: `POST https://api.muapi.ai/api/v1/seedance-2.5-intl-video-extend`
- **Model ID**: `seedance-2.5-intl-video-extend`
- **Category**: video to video
- **Variant**: Intl Video Extend
- **Family**: seedance-2.5
- **Cost**: 1.87 credits per call (some models compute cost dynamically based on params)

## API Usage

MuApi uses a **submit-then-poll** pattern: submit a job, get a `request_id`, then poll the predictions endpoint until `status` is `completed`. Optionally pass `?webhook=YOUR_URL` on the submit call to receive a POST callback when the job finishes (skip polling).

**Authentication**: send your MuApi key in the `x-api-key` header. Get one at https://muapi.ai/access-keys.

### 1. Submit a job

```http
POST https://api.muapi.ai/api/v1/seedance-2.5-intl-video-extend
Content-Type: application/json
x-api-key: YOUR_API_KEY
```

**Minimum (required only):**

```json
{
  "prompt": "<prompt>",
  "video_url": "https://example.com/your-video_url"
}
```

**Full example (all params):**

```json
{
  "prompt": "<prompt>",
  "video_url": "https://example.com/your-video_url",
  "last_image": "https://example.com/your-last_image",
  "duration": 5,
  "aspect_ratio": "16:9",
  "generate_audio": true,
  "seed": "<seed>",
  "high_bitrate": false
}
```

**Response:**

```json
{
  "request_id": "abc123",
  "status": "processing"
}
```

### 2. Poll for the result

```http
GET https://api.muapi.ai/api/v1/predictions/{request_id}/result
x-api-key: YOUR_API_KEY
```

Possible `status` values: `queued`, `pending`, `processing`, `completed`, `failed`, `cancelled`. Poll every 2-5 seconds until terminal. When `completed`, the result URLs are in the `outputs` array.

**Example response when `completed`:**

```json
{
  "id": "abc123",
  "status": "completed",
  "outputs": [
    "https://cdn.muapi.ai/.../output.png"
  ],
  "urls": {
    "get": "https://api.muapi.ai/api/v1/predictions/abc123/result"
  },
  "created_at": "2026-05-08T12:34:56Z",
  "has_nsfw_contents": []
}
```

### cURL

```bash
# 1. Submit
REQUEST_ID=$(curl -s -X POST https://api.muapi.ai/api/v1/seedance-2.5-intl-video-extend \
  -H "x-api-key: $MUAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"<prompt>","video_url":"https://example.com/your-video_url"}' | jq -r .request_id)

# 2. Poll until completed
while :; do
  RESP=$(curl -s https://api.muapi.ai/api/v1/predictions/$REQUEST_ID/result -H "x-api-key: $MUAPI_API_KEY")
  STATUS=$(echo "$RESP" | jq -r .status)
  [ "$STATUS" = "completed" ] && echo "$RESP" | jq .outputs && break
  [ "$STATUS" = "failed" ] && echo "$RESP" && exit 1
  sleep 3
done
```

### Python

```python
import os, time, requests

API = "https://api.muapi.ai/api/v1"
headers = {"x-api-key": os.environ["MUAPI_API_KEY"]}

r = requests.post(f"{API}/seedance-2.5-intl-video-extend", headers=headers, json={"prompt":"<prompt>","video_url":"https://example.com/your-video_url"})
request_id = r.json()["request_id"]

while True:
    res = requests.get(f"{API}/predictions/{request_id}/result", headers=headers).json()
    if res["status"] == "completed":
        print(res["outputs"]); break
    if res["status"] == "failed":
        raise RuntimeError(res.get("error")); 
    time.sleep(3)
```

## Input Schema

The API accepts the following input parameters:

- **`prompt`** (`string`, _required_):
  Desired cinematic continuation — action, camera movement, lighting, mood.

- **`video_url`** (`string`, _required_):
  URL of the video to extend. Generation continues from its last frame.

- **`last_image`** (`string`, _optional_):
  Optional target frame URL. When set, the continuation interpolates from the input video's final frame toward this image.

- **`duration`** (`int`, _optional_):
  Length of the extension clip in seconds.
  - Default: `5`

- **`aspect_ratio`** (`string`, _optional_):
  Aspect ratio of the output video.
  - Default: `"16:9"`
  - Options: `"16:9"`, `"9:16"`, `"1:1"`, `"4:3"`, `"3:4"`, `"21:9"`, `"9:21"`

- **`generate_audio`** (`boolean`, _optional_):
  Whether to generate synchronized audio for the new segment.
  - Default: `true`

- **`seed`** (`int`, _optional_):
  Random seed for reproducible generation. Use -1 for random.

- **`high_bitrate`** (`boolean`, _optional_):
  Enable high bitrate mode for better visual fidelity. Produces larger files.
  - Default: `false`

## Output Schema

The polling endpoint returns the following fields:

- **`id`** (`string`): The request ID.
- **`status`** (`string`): One of `queued`, `pending`, `processing`, `completed`, `failed`, `cancelled`.
- **`outputs`** (`array`): URLs to generated images/videos/audio. Empty until `status` is `completed`.
- **`urls.get`** (`string`): Self-link to re-fetch this prediction.
- **`error`** (`string` | `null`): Error message if `status` is `failed`.
- **`created_at`** (`string`): ISO-8601 timestamp of when the request was created.
- **`has_nsfw_contents`** (`array of boolean`): Per-output NSFW detection flags.

## Webhooks (optional)

Append `?webhook=https://your-server/path` to the submit URL. When the job reaches a terminal state, MuApi will POST the same shape as the polling response to your URL — no polling needed.

## Agent Integration

MuApi ships an MCP server and CLI so agents (Claude Code, Cursor, custom) can call this endpoint without writing HTTP code:

```bash
# Install the CLI
npm install -g muapi-cli

# Authenticate once
muapi auth login

# Expose all MuApi models as MCP tools to your agent
muapi mcp serve
```

The MCP server exposes tools that wrap submit + poll for every model, including `seedance-2.5-intl-video-extend`. See `muapi --help` for category-specific shortcuts (`muapi image generate`, `muapi video from-image`, etc.).

## Related Models
- [Spicy Image to Video](https://muapi.ai/playground/seedance-2.5-spicy-image-to-video)
- [Spicy Video Edit 480p](https://muapi.ai/playground/seedance-2.5-spicy-video-edit-480p)
- [Image to Video](https://muapi.ai/playground/seedance-2.5-image-to-video)
- [Text to Video](https://muapi.ai/playground/seedance-2.5-text-to-video)
- [Spicy Text to Video](https://muapi.ai/playground/seedance-2.5-spicy-text-to-video)
- [Text to Video 4K](https://muapi.ai/playground/seedance-2.5-text-to-video-4k)
- [Text to Video 480p](https://muapi.ai/playground/seedance-2.5-text-to-video-480p)
- [Video Extend 1080p](https://muapi.ai/playground/seedance-2.5-video-extend-1080p)
- [Image to Video 480p](https://muapi.ai/playground/seedance-2.5-image-to-video-480p)
- [First & Last Frame](https://muapi.ai/playground/seedance-2.5-first-last-frame)
- [First & Last Frame 480p](https://muapi.ai/playground/seedance-2.5-first-last-frame-480p)
- [Omni Reference](https://muapi.ai/playground/seedance-2.5-omni-reference)
- [Omni Reference 480p](https://muapi.ai/playground/seedance-2.5-omni-reference-480p)
- [Video Edit 1080p](https://muapi.ai/playground/seedance-2.5-video-edit-1080p)
- [Spicy Video Edit 1080p](https://muapi.ai/playground/seedance-2.5-spicy-video-edit-1080p)
- [Spicy Video Extend 480p](https://muapi.ai/playground/seedance-2.5-spicy-video-extend-480p)
- [Omni Reference 4K](https://muapi.ai/playground/seedance-2.5-omni-reference-4k)
- [Video Edit](https://muapi.ai/playground/seedance-2.5-video-edit)
- [Video Edit 480p](https://muapi.ai/playground/seedance-2.5-video-edit-480p)
- [Text to Video 1080p](https://muapi.ai/playground/seedance-2.5-text-to-video-1080p)
- [Image to Video 1080p](https://muapi.ai/playground/seedance-2.5-image-to-video-1080p)
- [Image to Video 4K](https://muapi.ai/playground/seedance-2.5-image-to-video-4k)
- [First & Last Frame 1080p](https://muapi.ai/playground/seedance-2.5-first-last-frame-1080p)
- [First & Last Frame 4K](https://muapi.ai/playground/seedance-2.5-first-last-frame-4k)
- [Omni Reference 1080p](https://muapi.ai/playground/seedance-2.5-omni-reference-1080p)
- [Video Extend 4K](https://muapi.ai/playground/seedance-2.5-video-extend-4k)
- [Video Edit 4K](https://muapi.ai/playground/seedance-2.5-video-edit-4k)
- [Video Extend](https://muapi.ai/playground/seedance-2.5-video-extend)
- [Video Extend 480p](https://muapi.ai/playground/seedance-2.5-video-extend-480p)
- [Intl Text to Video](https://muapi.ai/playground/seedance-2.5-intl-text-to-video)
- [Intl Text to Video 480p](https://muapi.ai/playground/seedance-2.5-intl-text-to-video-480p)
- [Spicy Text to Video 480p](https://muapi.ai/playground/seedance-2.5-spicy-text-to-video-480p)
- [Intl Text to Video 1080p](https://muapi.ai/playground/seedance-2.5-intl-text-to-video-1080p)
- [Spicy Text to Video 1080p](https://muapi.ai/playground/seedance-2.5-spicy-text-to-video-1080p)
- [Intl Text to Video 4K](https://muapi.ai/playground/seedance-2.5-intl-text-to-video-4k)
- [Spicy Text to Video 4K](https://muapi.ai/playground/seedance-2.5-spicy-text-to-video-4k)
- [Intl Image to Video](https://muapi.ai/playground/seedance-2.5-intl-image-to-video)
- [Intl Image to Video 480p](https://muapi.ai/playground/seedance-2.5-intl-image-to-video-480p)
- [Intl Image to Video 1080p](https://muapi.ai/playground/seedance-2.5-intl-image-to-video-1080p)
- [Intl Image to Video 4K](https://muapi.ai/playground/seedance-2.5-intl-image-to-video-4k)
- [Spicy Image to Video 4K](https://muapi.ai/playground/seedance-2.5-spicy-image-to-video-4k)
- [Spicy First & Last Frame](https://muapi.ai/playground/seedance-2.5-spicy-first-last-frame)
- [Intl First & Last Frame 480p](https://muapi.ai/playground/seedance-2.5-intl-first-last-frame-480p)
- [Spicy First & Last Frame 1080p](https://muapi.ai/playground/seedance-2.5-spicy-first-last-frame-1080p)
- [Spicy First & Last Frame 4K](https://muapi.ai/playground/seedance-2.5-spicy-first-last-frame-4k)
- [Intl Omni Reference 480p](https://muapi.ai/playground/seedance-2.5-intl-omni-reference-480p)
- [Spicy Image to Video 480p](https://muapi.ai/playground/seedance-2.5-spicy-image-to-video-480p)
- [Intl Video Edit](https://muapi.ai/playground/seedance-2.5-intl-video-edit)
- [Intl Video Extend](https://muapi.ai/playground/seedance-2.5-intl-video-extend)
- [Spicy Image to Video 1080p](https://muapi.ai/playground/seedance-2.5-spicy-image-to-video-1080p)
- [Spicy Omni Reference](https://muapi.ai/playground/seedance-2.5-spicy-omni-reference)
- [Intl First & Last Frame](https://muapi.ai/playground/seedance-2.5-intl-first-last-frame)
- [Spicy First & Last Frame 480p](https://muapi.ai/playground/seedance-2.5-spicy-first-last-frame-480p)
- [Intl First & Last Frame 1080p](https://muapi.ai/playground/seedance-2.5-intl-first-last-frame-1080p)
- [Intl First & Last Frame 4K](https://muapi.ai/playground/seedance-2.5-intl-first-last-frame-4k)
- [Intl Omni Reference](https://muapi.ai/playground/seedance-2.5-intl-omni-reference)
- [Spicy Omni Reference 480p](https://muapi.ai/playground/seedance-2.5-spicy-omni-reference-480p)
- [Intl Omni Reference 1080p](https://muapi.ai/playground/seedance-2.5-intl-omni-reference-1080p)
- [Spicy Omni Reference 1080p](https://muapi.ai/playground/seedance-2.5-spicy-omni-reference-1080p)
- [Intl Omni Reference 4K](https://muapi.ai/playground/seedance-2.5-intl-omni-reference-4k)
- [Spicy Omni Reference 4K](https://muapi.ai/playground/seedance-2.5-spicy-omni-reference-4k)
- [Intl Video Extend 4K](https://muapi.ai/playground/seedance-2.5-intl-video-extend-4k)
- [Spicy Video Edit](https://muapi.ai/playground/seedance-2.5-spicy-video-edit)
- [Intl Video Edit 480p](https://muapi.ai/playground/seedance-2.5-intl-video-edit-480p)
- [Intl Video Edit 1080p](https://muapi.ai/playground/seedance-2.5-intl-video-edit-1080p)
- [Intl Video Edit 4K](https://muapi.ai/playground/seedance-2.5-intl-video-edit-4k)
- [Spicy Video Edit 4K](https://muapi.ai/playground/seedance-2.5-spicy-video-edit-4k)
- [Spicy Video Extend](https://muapi.ai/playground/seedance-2.5-spicy-video-extend)
- [Intl Video Extend 480p](https://muapi.ai/playground/seedance-2.5-intl-video-extend-480p)
- [Intl Video Extend 1080p](https://muapi.ai/playground/seedance-2.5-intl-video-extend-1080p)
- [Spicy Video Extend 1080p](https://muapi.ai/playground/seedance-2.5-spicy-video-extend-1080p)
- [Spicy Video Extend 4K](https://muapi.ai/playground/seedance-2.5-spicy-video-extend-4k)

## Resources
- [Playground Page](https://muapi.ai/playground/seedance-2.5-intl-video-extend)
- [API Reference](https://muapi.ai/playground/seedance-2.5-intl-video-extend?tab=2)
- [Global llms.txt](https://muapi.ai/llms.txt)