# H3 Max Recast

> Run H3 Max Recast by falai online or via API. From $0.30 per second, no setup.

**URL:** https://inference.sh/apps/falai/minimax-h3-max-recast
**Last updated:** 2026-10-20

---

Replace the people in a video with those in reference photos using MiniMax H3 Max via fal. Keeps motion, camera, cuts and audio. Up to 4 people, 768P or 1080P.

- app: `falai/minimax-h3-max-recast`
- maker: [falai](https://inference.sh/apps/falai.md)
- category: [video](https://inference.sh/apps/category/video.md)
- input → output: video → video
- tasks: [video to video](https://inference.sh/apps/tag/video-to-video.md), [face swap](https://inference.sh/apps/tag/face-swap.md), [character swap](https://inference.sh/apps/tag/character-swap.md)
- price: $0.30/sec at 768P, $0.45/sec at 1080P
- runs via: api, javascript and python sdk, belt cli, mcp

## minimax-h3-max-recast API Guide

### About
replace the people in a video with those in reference photos using minimax h3 max via fal. keeps motion, camera, cuts and audio. up to 4 people, 768p or 1080p.

### 1. Calling the API

#### Install the Client

```bash
pip install inferencesh
```

#### Setup Your API Key
Set `INFERENCE_API_KEY` as an environment variable. Get your key from settings → api keys.

```bash
export INFERENCE_API_KEY="inf_your_key"
```

#### Run and Get Result

```python
import os
from inferencesh import inference

client = inference(api_key=os.environ["INFERENCE_API_KEY"])


result = client.run({
        "app": "falai/minimax-h3-max-recast@46mwsfej",
        "input": {
            "video": "https://example.com/file.png",
            "reference_images": [
                "https://example.com/file.png"
            ]
        }
    })

print(result["output"])
```

#### Stream Live Updates

```python
import os
from inferencesh import inference

client = inference(api_key=os.environ["INFERENCE_API_KEY"])


## stream=True yields updates as they arrive
for update in client.run({
        "app": "falai/minimax-h3-max-recast@46mwsfej",
        "input": {
            "video": "https://example.com/file.png",
            "reference_images": [
                "https://example.com/file.png"
            ]
        }
    }, stream=True):
    if update.get("progress"):
        print(f"progress: {update['progress']}%")
    if update.get("output"):
        print(f"output: {update['output']}")
```

### 2. Authentication
The API uses API keys for authentication. See the authentication docs for detailed setup instructions.

### 3. Files

#### Automatic Upload

```python
## local file paths are automatically uploaded
result = client.run({
    "app": "falai/minimax-h3-max-recast@46mwsfej",
    "input": {
        "image": "/path/to/local/image.png",  # detected & uploaded
        "audio": "https://example.com/audio.mp3",  # url passed through
    }
})
```

#### Manual Upload

```python
## upload and get a hosted URL
file = client.files.upload("/path/to/file.png")
print(file.uri)  # https://cloud.inference.sh/...
```

### 4. Schema

#### Input
- **video** (string) *required*: Source video, 5 to 30 seconds, with no single shot longer than 15 seconds.
- **reference_images** (array) *required*: One photo per new person (max 4). By default they replace the main people from left to right, in every shot they appear in.
- **prompt** (string): Optional: who becomes whom, or what else to keep or change.
- **resolution** (string): Output resolution.
- **enhance_realism** (boolean): More natural skin textures and better blending of the new people into the scene.
- **seed** (integer): Random seed for reproducible generation.

#### Output
- **seed** (integer): Seed used for generation.
- **video** (string): The recast video, with the source sound.

## other video apps

- [H3 Max Styles](https://inference.sh/apps/falai/minimax-h3-max-styles.md): $0.08/sec (768P)
- [H3 Max Insert Video](https://inference.sh/apps/falai/minimax-h3-max-insert-video.md): $0.05/sec 480p, $0.06/sec 768p
- [H3 Max 3D to Video](https://inference.sh/apps/falai/minimax-h3-max-3d-to-video.md): $0.50/request + $0.05/sec (480P), $0.08/sec (768P), $0.16/sec (1080P) + $0.10/generated ref; 5s min
- [H3 Max Relight](https://inference.sh/apps/falai/minimax-h3-max-relight.md): $0.05/s 480P, $0.08/s 768P, $0.16/s 1080P, $0.32/s 2K; up to 15s/video
- [H3 Max Lip Sync](https://inference.sh/apps/falai/minimax-h3-max-lip-sync.md): 480P $0.05/s, 768P $0.08/s, 1080P $0.16/s, 2K $0.32/s; +20% if >15s

## faq

### how much does H3 Max Recast cost?

$0.30/sec at 768P, $0.45/sec at 1080P. you pay per run from your inference shell credits. no subscription is required.

### how do I run H3 Max Recast via api?

call falai/minimax-h3-max-recast with the javascript or python sdk, the rest api, or `belt app run falai/minimax-h3-max-recast` from a terminal. the api reference on this page lists every input.

### who makes H3 Max Recast?

H3 Max Recast is made by falai and runs on inference shell. every falai app is listed at https://inference.sh/apps/falai.

### can my agent use H3 Max Recast?

yes. agents call it as a tool through the inference shell mcp server (https://api.inference.sh/mcp), the belt cli or the sdk, and pay per run like you do.

### what are the alternatives to H3 Max Recast?

other video apps on inference shell include H3 Max Styles, H3 Max Insert Video, H3 Max 3D to Video, H3 Max Relight. they run through the same api, so switching is a one-line change.