# H3 Max Turbo Extend Video API

> Förlänger en källvideo på 1.625 till 60 sekunder med 0.71 till 15 sekunder nytt promptstyrt material

Fortsätter en video från `video_url` (upp till 50 MB) genom att lägga till nytt material som beskrivs i `prompt`. `duration` anger den tillagda längden från 0.71 till 15 sekunder och upplösningen går från 480P till 2K. `output` returnerar antingen hela den förlängda videon eller bara fortsättningsklippet. Upp till 3 `reference_audio_urls` kan styra ljudet.

- Model id: `minimax/h3-max-turbo/extend-video`
- Made by: MiniMax
- Category: Video to Video
- Output: video
- Price: from $0.025 / second (5 s ≈ $0.125) (cheapest run $0.125 (125 API credits))
- Run: `POST https://api.doitong.ru/v1/run/minimax/h3-max-turbo/extend-video`
- Quote: `POST https://api.doitong.ru/v1/quote/minimax/h3-max-turbo/extend-video`
- Docs page: https://doitong.com/sv/developers/models/minimax/h3-max-turbo/extend-video

## Pricing

Price: **from $0.025 / second (5 s ≈ $0.125)** (the lowest tier; the quote prices your exact input). Billed per second of output (`duration`, default 15).

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `resolution` = 768P: $0.04 (40 API credits) / second
- When `resolution` = 1080P: $0.08 (80 API credits) / second
- When `resolution` = 2K: $0.16 (160 API credits) / second

The full example input below costs $0.20 = 200 API credits (5 s × 40 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.ru/v1/quote/minimax/h3-max-turbo/extend-video` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `video_url` | `video` | string (video URL) | yes |  | ≥ 1 characters | URL till källvideo för förlängning; filen får inte överstiga 50 MB. Godkända videor har ett bildförhållande på 0.4–2.5 och en längd på 1.625 s–60 s. |
| `prompt` |  | string | yes |  | 1 – 50000 characters | Beskrivning av händelserna som ska följa, snarare än en beskrivning av källmaterialet. |
| `reference_audio_urls` |  | array of audio URL | no |  | ≤ 3 items | Valfria klipp som styr fortsättningens nya ljud i stället för källans ljudspår; ange deras roller i prompten, till exempel 'Audio 1 for the voice' och 'Audio 2 for background music'. Varje klipp måste vara 2–15 sekunder långt, med högst 15 sekunder totalt för alla klipp. Den fullständiga förlängda videon behåller källans ursprungliga ljudspår, vars slut fortfarande styr övergången. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Källstyrd promptförbättring för en mer konsekvent fortsättning. När den aktiveras kan systemet automatiskt revidera prompten, men bearbetningen kan ta längre tid. |
| `duration` |  | number | no | `5` | 0.71 – 15 | Begärd mängd nytt videomaterial, mätt i sekunder i stället för fortsättningsklippets fullständiga längd. Klippet övertar också källans sista 1.625 sekunder, och avrundning av bildrutor kan lägga till ytterligare tid. |
| `resolution` |  | enum (string) | no | `768P` | `480P`, `768P`, `1080P`, `2K` | Den resulterande videons upplösning. |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `21:9`, `16:9`, `4:3`, `1:1`, `3:4`, `9:16` | Utdata-proportioner: val av ett förhållande beskär för att matcha det, medan 'auto' använder källvideons bildförhållande. |
| `seed` |  | integer \| null | no |  |  | Frö för fortsättningsgenerering; om det utelämnas används ett slumpmässigt värde. |
| `output` |  | enum (string) | no | `extended` | `extended`, `continuation` | Utdata-läge: 'continuation' tillhandahåller det nya videomaterialet föregånget av en 1.625 sekunder lång upprepning av källans slut. Om du vill få källan sammanfogad med det nya videomaterialet i en enda video väljer du 'extended'. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Moderering av både indatavideon och prompten. |

File parameters (`video`, `reference_audio_urls`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "video": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

A fuller example:

```json
{
  "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/minimax/h3-max-turbo/extend-video?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.ru/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/minimax/h3-max-turbo/extend-video?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.ru/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/minimax/h3-max-turbo/extend-video", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.ru/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "minimax/h3-max-turbo/extend-video",
      "input": {
        "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "minimax/h3-max-turbo/extend-video",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 200,
    "usd": "0.20",
    "charged": 200,
    "refunded": 0
  },
  "input": {
    "video_url": "https://content.doitong.com/video/showcase/v3/gen_fox_cartoon.mp4",
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "seed": 42,
    "duration": 5,
    "source": {},
    "expanded_prompt": "string",
    "timings": {}
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} | Resulterande video, med en inledande upprepning på 1.625 sekunder vid användning av läget 'continuation'. |
| `seed` | integer | Frö som används när fortsättningen genereras. |
| `duration` | number | Den returnerade videons längd i sekunder. |
| `source` | object | Metadata för källmaterialet som omfattar dimensioner (bredd och höjd), bildfrekvens, längd och ljud. |
| `expanded_prompt` | string \| null | Utökad prompttext eller null om inga ändringar gjordes. |
| `timings` | object |  |

## Related models

- [H3 Max Turbo Text to Video](https://doitong.com/developers/models/minimax/h3-max-turbo/text-to-video.md) (`minimax/h3-max-turbo/text-to-video`): from $0.0163 / second of output video
- [H3 Max Turbo Image to Video](https://doitong.com/developers/models/minimax/h3-max-turbo/image-to-video.md) (`minimax/h3-max-turbo/image-to-video`): from $0.0163 / second of output video
- [H3 Max](https://doitong.com/developers/models/minimax/h3-max/insert-video.md) (`minimax/h3-max/insert-video`): from $0.05 / second
- [H3 Max Extend Video](https://doitong.com/developers/models/minimax/h3-max/extend-video.md) (`minimax/h3-max/extend-video`): from $0.05 / second of output video
- [H3 Max Recast](https://doitong.com/developers/models/minimax/h3-max/recast.md) (`minimax/h3-max/recast`): from $0.30 / second of input video
- [H3 Max Reframe](https://doitong.com/developers/models/minimax/h3-max/reframe-video.md) (`minimax/h3-max/reframe-video`): from $0.05 / second of input video
- [H3 Max Relight](https://doitong.com/developers/models/minimax/h3-max/relight.md) (`minimax/h3-max/relight`): from $0.05 / second of input video
- [AMT Interpolation](https://doitong.com/developers/models/amt-interpolation.md) (`amt-interpolation`): $0.000575 / second of processing time

## Links

- HTML page: https://doitong.com/developers/models/minimax/h3-max-turbo/extend-video
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=minimax/h3-max-turbo/extend-video
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.ru/v1/models/minimax/h3-max-turbo/extend-video