# Flux 3 | Video Continuation

FLUX.3 is Black Forest Labs’ frontier video extension model, continuing existing clips with smooth, coherent motion while preserving the original scene, style, and visual consistency.

## API Information

- **Model Slug:** flux-3-video-continuation
- **Branded URL:** https://www.eachlabs.ai/black-forest-labs/flux-3/flux-3-video-continuation
- **Provider:** Black Forest Labs
- **Category:** Video to Video
- **Output Type:** video
- **Status:** active
- **Base Cost:** $0.12–$0.53 per second, depending on draft and resolution
- **Estimated Processing Time:** 220 seconds
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/flux-3-video-continuation

## Pricing

- **Charge Type:** dynamic
- **Estimate:** $0.12–$0.53 per second, depending on draft and resolution
- **Pricing Details:** true: $0.12
- **Pricing Details:** fhd: $0.53
- **Pricing Details:** default: $0.41

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| video_url | string | Yes | - | - | URL of the video to continue; the generated clip carries on from its final frames. MP4. |
| prompt | string | Yes | - | - | The text prompt describing how the video continues, including any audio, dialogue or ambient sound. |
| resolution | string | No | hd | hd, fhd | Video resolution class. hd is up to 1MP per frame (e.g. 1280x704); fhd is up to 2MP (e.g. 1920x1088), finished by the video upsampler. Exact dimensions vary with the aspect ratio. Draft renders are always hd. |
| duration | string | No | auto | auto, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 | Duration of the generated continuation in seconds, from 5 to 20, or auto to let the model fit the content. |
| aspect_ratio | string | No | auto | auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16 | Output aspect ratio. auto lets the model choose from the prompt and the input video. 16:9 for landscape, 9:16 for portrait/vertical, 1:1 for square, 21:9 for ultrawide cinematic. |
| generate_audio | boolean | No | true | - | Generate synchronized audio alongside the video. Audio is included at no extra charge. |
| safety_tolerance | integer | No | 2 | 0–4 | Controls the safety tolerance used by the provider for content moderation. 0 is the strictest and 4 is the most permissive. |
| draft | boolean | No | false | - | Draft mode: a rapid, cheaper preview render for exploration. Draft renders are hd-only and the result includes a draft_cache reference for a later full-quality re-render. |

## 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": "flux-3-video-continuation",
  "input": {
    "prompt": "The dancer must continue performing the pantomime dance.",
    "video_url": "https://cdn-us.eachlabs.ai/defaults/a6cbf41d1ca948f3ac8c18f66f5d5e8c.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

**Flux 3 | Video Continuation Overview**

Flux 3 | Video Continuation is a frontier **video-to-video** extension model from Black Forest Labs, built on the multimodal **FLUX 3 Video** foundation for synchronized image, video, and audio generation. It continues existing clips by predicting future frames and soundtrack in a single pass, creating smooth motion while preserving the original scene composition, style, and temporal coherence. Unlike traditional video upscalers or stylizers, Flux 3 | Video Continuation leverages the unified Self-Flow backbone of FLUX 3, which is trained jointly across image, video, and audio tokens, enabling highly consistent visual and auditory continuity over extended sequences. Integrated on each::labs, it focuses specifically on extending user-provided videos, rather than generating standalone clips from scratch.

## 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.