# Runway | Act-Two

Runway Act-Two turns performance videos into realistic character animations by transferring gestures and expressions.

## API Information

- **Model Slug:** runway-act-two
- **Branded URL:** https://www.eachlabs.ai/runway/runway/runway-act-two
- **Provider:** Runway
- **Category:** Image to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Estimated Processing Time:** 200 seconds
- **Last Updated:** 2026-04-02
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/runway-act-two

## Pricing

Pricing information not available.

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| character_type | string | Yes | image | image,video | Type of character input. image: still photo (default). video: video clip. |
| character_uri | string | Yes | - | - | Image or video of the character to animate. A face must be clearly visible. |
| reference_uri | string | Yes | - | - | Video of a person performing the motion and expressions you want transferred to the character. Duration: 3-30 seconds. |
| aspect_ratio | string | Yes | 1280:720 | 1280:720,720:1280,960:960,1104:832,832:1104,1584:672 | Output video resolution. |
| body_control | boolean | No | true | - | Enable body movement transfer from the reference video. |
| expression_intensity | integer | No | 3 | 1–5 | Intensity of facial expressions (1-5). 1: subtle, 3: balanced, 5: maximum. |
| seed | integer | No | - | - | Random seed for reproducible generation. |
| public_figure_moderation | string | No | low | auto,low | Content moderation level for public figures. auto: standard. low: relaxed (default). |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "runway-act-two",
  "input": {
    "aspect_ratio": "1280:720",
    "reference_uri": "https://storage.googleapis.com/magicpoint/inputs/runway-act-two-input-video.mp4",
    "character_uri": "https://storage.googleapis.com/magicpoint/inputs/runway-act-two-input-image.jpeg",
    "character_type": "image"
  }
}'
```

## 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 "X-API-Key: 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 `X-API-Key` |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**runway-act-two — Image-to-Video AI Model**

Runway Act-Two transforms static performance videos into hyper-realistic character animations by precisely transferring gestures, facial expressions, and body movements from an actor to any target character. Developed by Runway as part of the **runway** family, **runway-act-two** solves the challenge of creating lifelike animations without manual keyframing, enabling creators to produce professional-grade videos from simple inputs like a reference performance clip and a character image. This **image-to-video AI model** stands out in **Runway image-to-video** workflows by maintaining temporal consistency and emotional fidelity across extended sequences, ideal for filmmakers and animators seeking "AI character animation from video performance" results.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `X-API-Key: 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.