# Veo 3.1 | First Last Frame to Video

Creates seamless motion between the first and last frame, producing fluid transitions. Ideal for time-lapse, transformation, or storyboard-based scenes.

## API Information

- **Model Slug:** veo3-1-first-last-frame-to-video
- **Branded URL:** https://www.eachlabs.ai/google/veo3-1/veo3-1-first-last-frame-to-video
- **Provider:** Google
- **Category:** Image to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** 720p/1080p (default), Audio On/default: $0.40 per second of video duration (duration defaults to 8s)
- **Estimated Processing Time:** 75 seconds
- **Last Updated:** 2026-08-16
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/veo3-1-first-last-frame-to-video

## Pricing

- **Charge Type:** dynamic
- **Estimated Price (default example):** $3.20
- **Pricing Details:** 720p/1080p (default), Audio On/default: $0.40 per second of video duration (duration defaults to 8s)

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| resolution eq_i "4k" AND generate_audio eq_i "false" | 4k, Audio Off: $0.40 per second of video duration |
| resolution eq_i "4k" | 4k, Audio On/default: $0.60 per second of video duration |
| generate_audio eq_i "false" | 720p/1080p (default), Audio Off: $0.20 per second of video duration |
| Rule 4 | 720p/1080p (default), Audio On/default: $0.40 per second of video duration (duration defaults to 8s) |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| first_frame_url | string | Yes | - | - | URL of the first frame of the video |
| last_frame_url | string | Yes | - | - | URL of the last frame of the video |
| prompt | string | Yes | - | - | The text prompt describing the video you want to generate |
| duration | integer | No | 8 | 4,6,8 | The duration of the generated video in seconds |
| aspect_ratio | string | No | 16:9 | 9:16,16:9 | Aspect ratio of the generated video |
| resolution | string | No | 720p | 720p,1080p | Resolution of the generated video |
| generate_audio | boolean | No | true | - | Whether to generate audio for the video. If false, %33 less credits will be used. |
| 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-first-last-frame-to-video",
  "input": {
    "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \\\"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Eachlabs? It's crazy!\\\" SHe is holidng a coffee cup",
    "first_frame_url": "https://storage.googleapis.com/magicpoint/inputs/veo3-1-first-last-frame-to-video-input-firstt.png",
    "last_frame_url": "https://storage.googleapis.com/magicpoint/inputs/veo3-1-first-last-frame-to-video-input-last.png"
  }
}'
```

## 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-first-last-frame-to-video — Image-to-Video AI Model**

Developed by Google as part of the **Veo 3.1** family, **veo3.1-first-last-frame-to-video** specializes in generating seamless 8-second videos by interpolating fluid motion between a user-specified first and last frame, perfect for controlled storytelling in time-lapses, transformations, or storyboard sequences. This **Google image-to-video** capability stands out with frame-specific generation, ensuring precise transitions that maintain visual consistency without morphing artifacts common in other models. Accessible via the Gemini API, it supports high-fidelity outputs up to 4K resolution, making it ideal for creators seeking professional-grade **image-to-video AI model** results for YouTube Shorts or cinematic workflows.

## 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.