# Veo 3.1 | Fast | Extend Video

In speed-critical projects, minimize render times and rapidly expand your video duration without sacrificing quality with veo3-1-fast-extend-video.

## API Information

- **Model Slug:** veo3-1-fast-extend-video
- **Branded URL:** https://www.eachlabs.ai/google/veo3-1/veo3-1-fast-extend-video
- **Provider:** Google
- **Category:** Video to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** 7s, Audio On/default (default when generate_audio not provided)
- **Estimated Processing Time:** 80 seconds
- **Last Updated:** 2026-06-10
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/veo3-1-fast-extend-video

## Pricing

- **Charge Type:** dynamic
- **Estimated Price (default example):** $1.05
- **Pricing Details:** 7s, Audio On/default (default when generate_audio not provided)

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| generate_audio eq_i "false" | 7s, Audio Off (duration is fixed at 7s for this model) |
| Rule 2 | 7s, Audio On/default (default when generate_audio not provided) |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | The text prompt describing how the video should be extended |
| video_url | string | Yes | - | - | URL of the video to extend. The video should be 720p or 1080p resolution in 16:9 or 9:16 aspect ratio. |
| aspect_ratio | string | No | auto | auto,16:9,9:16 | The aspect ratio of the generated video. |
| duration | string | No | 7 | 7 | The duration of the generated video. |
| resolution | string | No | 720p | 720p | The resolution of the generated video. |
| generate_audio | boolean | No | true | - | Whether to generate audio for the video. |
| auto_fix | boolean | No | false | - | Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "veo3-1-fast-extend-video",
  "input": {
    "prompt": "Continue the scene with the same style and movement.",
    "video_url": "https://storage.googleapis.com/magicpoint/inputs/veo3-1-fast-extend-video-input.mp4"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "string (URL of generated video)",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "Authorization: Bearer YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `Authorization` bearer token |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**veo3.1-fast-extend-video — Video-to-Video AI Model**

In speed-critical projects, **veo3.1-fast-extend-video** from Google minimizes render times while rapidly expanding video duration through seamless extensions, ideal for developers seeking a **Google video-to-video** solution. Part of the advanced Veo 3.1 family, this model excels at chaining short clips into longer sequences up to 60 seconds or more, maintaining visual consistency and native audio synchronization without quality loss. Creators using **veo3.1-fast-extend-video** for **video-to-video AI model** workflows can extend base clips by 7-8 seconds per iteration, perfect for quick iterations in professional production.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `Authorization: Bearer YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.