# Mirelo SFX 2.0 (Video to Video)

> Add a synced soundtrack to your video with Mirelo SFX 2.0 — returns the video with its new audio.

## Overview

- **Model ID**: `mirelo-sfx-2.0-video-to-video`
- **Workflow**: `mirelo-ai/sfx2.0/video-to-video`
- **Provider**: Mirelo
- **Category**: Video → Video (video)
- **Output**: A video URL.
- **Tags**: video to video, video required, synced soundtrack
- **Unified endpoint**: `POST https://api.picsart.com/workflows/v1/models/execute` (model id in the body)
- **Compatibility endpoint**: `POST https://api.picsart.com/workflows/mirelo-ai/sfx2.0/video-to-video/execute` (vendor's own parameters)
- **Execution**: long-running — use the async submit/poll pair or the SDK, which polls for you
- **Model page**: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video

## Pricing

Live pricing for this model is not published yet. See https://picsart.com/pricing/ or the Pricing tab of the model page (https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/pricing).

## Authentication

The SDK and the REST API authenticate with a Picsart API key sent as a bearer token. Create a key in the console at https://picsart.com/api-platform/dashboard/api-keys, keep it in a server-side environment variable, and never ship it in browser code or commit it.

```bash
export PICSART_API_KEY="YOUR_KEY"
```

```http
Authorization: Bearer $PICSART_API_KEY
```

The CLI and the MCP server do not use an API key: `gen-ai login` signs in through the browser once per machine and stores a token locally.

## Interfaces

- **SDK** — `@picsart/ai-sdk` (TypeScript, Node 20+, ESM). Type-safe `ai.generate()` / `ai.generateText()` with per-model parameter types; polls long jobs for you.
- **REST** — the API gateway at `https://api.picsart.com`. Sync `/execute`, or async `/submit` + `/{taskId}/result`.
- **CLI** — `@picsart/gen-ai` (`gen-ai`). Generate from a terminal, quote cost before spending, emit JSON for pipelines.
- **MCP** — the same models inside Claude Code, Cursor, Windsurf and other MCP hosts. Setup: https://picsart.com/gen-ai-mcp/

```bash
npm install @picsart/ai-sdk      # SDK
npm install -g @picsart/gen-ai   # CLI (also drives the MCP server)
```

## Unified API (recommended)

One parameter set, used by the SDK and by REST alike: the names below are what `ai.generate('mirelo-sfx-2.0-video-to-video', …)` takes, and what goes inside the inner `params` of a REST call. Over REST the model id travels in the body, not the path — one workflow, `v1/models`, fronts the whole catalogue.

### Execution modes

- **Sync** — `POST /workflows/v1/models/execute` returns the result in one call. Only for jobs that finish within ~20 seconds; otherwise it times out.
- **Async** — `POST /workflows/v1/models/submit` returns a task id; poll `GET /workflows/v1/models/{taskId}/result` until `response.status` is `COMPLETED` or `FAILED`. Task statuses: `ACCEPTED` · `IN_PROGRESS` · `COMPLETED` · `FAILED`.
- **SDK** — `ai.generate()` always awaits the finished result; polling is hidden.

Video jobs routinely outrun the sync limit: use async over REST, or the SDK, which polls for you.

### Input parameters

- **`videoUrl`** (`string`, _required_): Source Video
  - Accepts: video URL
- **`prompt`** (`string`, _optional_): Prompt
  - Max length: 2000 characters
- **`negativePrompt`** (`string`, _optional_): Negative Prompt
  - Max length: 1000 characters
- **`preserveSpeech`** (`boolean`, _optional_): Preserve Speech
  - Default: `true`
- **`duration`** (`number`, _optional_)
  - Default: `10`
  - Range: 1–600 (step 1)
- **`count`** (`number`, _optional_)
  - Default: `2`
  - Options: `1`, `2`, `3`, `4`
- **`seed`** (`number`, _optional_): Seed
  - Range: 0–2147483647 (step 1)

### Input JSON Schema

The inner `params` object. Over REST it is wrapped as `{ "params": { "model": "<id>", "params": <this> } }`; the SDK takes it directly.

```json
{
  "type": "object",
  "required": [
    "videoUrl"
  ],
  "properties": {
    "videoUrl": {
      "type": "string",
      "format": "uri",
      "description": "Source Video"
    },
    "prompt": {
      "type": "string",
      "maxLength": 2000,
      "description": "Prompt"
    },
    "negativePrompt": {
      "type": "string",
      "maxLength": 1000,
      "description": "Negative Prompt"
    },
    "preserveSpeech": {
      "type": "boolean",
      "default": true,
      "description": "Preserve Speech"
    },
    "duration": {
      "type": "number",
      "minimum": 1,
      "maximum": 600,
      "multipleOf": 1,
      "default": 10
    },
    "count": {
      "type": "number",
      "enum": [
        1,
        2,
        3,
        4
      ],
      "default": 2
    },
    "seed": {
      "type": "number",
      "minimum": 0,
      "maximum": 2147483647,
      "multipleOf": 1,
      "description": "Seed"
    }
  },
  "additionalProperties": false
}
```

### Required parameters example

The required parameters plus the defaults that shape the output, as a REST body:

```json
{
  "params": {
    "model": "mirelo-sfx-2.0-video-to-video",
    "params": {
      "videoUrl": "https://cdn.example.com/input.mp4",
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "duration": 10
    }
  }
}
```

### Response

The body is the gateway's status envelope: the output is at `response.result`, next to the task id, its status and the credits charged. Asset models return `url` plus an `items` array of results.

```json
{
  "status": "success",
  "response": {
    "id": "task_abc123",
    "status": "COMPLETED",
    "result": {
      "url": "https://cdn.picsart.com/…/result",
      "items": [
        {
          "url": "https://cdn.picsart.com/…/result"
        }
      ],
      "model": "mirelo-sfx-2.0-video-to-video"
    }
  }
}
```

What `ai.generate()` / `ai.generateText()` resolve to (the envelope already unwrapped):

```json
{
  "items": [
    {
      "url": "https://cdn.picsart.com/…/result"
    }
  ],
  "model": "mirelo-sfx-2.0-video-to-video"
}
```

### Usage examples

#### TypeScript (SDK)

```typescript
import { createClient } from '@picsart/ai-sdk';

const ai = createClient({
  apiKey: process.env.PICSART_API_KEY,
  apiUrl: 'https://api.picsart.com',
});

const result = await ai.generate('mirelo-sfx-2.0-video-to-video', {
  videoUrl: "https://cdn.example.com/input.mp4",
  prompt: "A serene mountain lake at golden hour, ultra detailed",
  duration: 10
});

console.log(result.url); // video URL
```

#### cURL (sync)

```bash
curl -X POST 'https://api.picsart.com/workflows/v1/models/execute' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "model": "mirelo-sfx-2.0-video-to-video",
    "params": {
      "videoUrl": "https://cdn.example.com/input.mp4",
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "duration": 10
    }
  }
}'
```

#### cURL (async: submit, then poll)

```bash
# 1. Submit the job
curl -X POST 'https://api.picsart.com/workflows/v1/models/submit' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "model": "mirelo-sfx-2.0-video-to-video",
    "params": {
      "videoUrl": "https://cdn.example.com/input.mp4",
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "duration": 10
    }
  }
}'
# → { "status": "success", "response": { "id": "task_abc123" } }

# 2. Poll until response.status is COMPLETED
curl 'https://api.picsart.com/workflows/v1/models/task_abc123/result' \
  -H 'Authorization: Bearer $PICSART_API_KEY'
```

#### CLI

```bash
gen-ai login  # once per machine
gen-ai models info mirelo-sfx-2.0-video-to-video  # this model's parameters
gen-ai pricing mirelo-sfx-2.0-video-to-video  # quote before spending credits
gen-ai generate -m mirelo-sfx-2.0-video-to-video \
  -p "A serene mountain lake at golden hour" \
  -d 10
```

## Compatibility API (vendor parameters)

Alongside the unified API, the `mirelo-ai/sfx2.0/video-to-video` workflow takes Mirelo's own parameters exactly as the vendor defines them — nothing renamed or reshaped. It is the shortest path onto Picsart for request bodies already written against the vendor; the trade is that a request is written for one vendor, and the result comes back in the vendor's own shape. Same authentication.

- **Endpoint**: `POST https://api.picsart.com/workflows/mirelo-ai/sfx2.0/video-to-video/execute` (sync) · `POST …/submit` + `GET …/{taskId}/result` (async)
- **SDK**: `ai.apis.run('mirelo-ai/sfx2.0/video-to-video', params, { mode })` — params forwarded verbatim

### Vendor parameters

| Parameter | Type | Required | Default | Details |
| --- | --- | --- | --- | --- |
| `duration` | `number` | no | `10` | Seconds of sound to generate, from 1 s to 600 s, clamped to the video's length. Over 10 s generates in 10 s windows. A video shorter than 1 s answers 400. · 1–600 |
| `text_prompt` | `string` | no | — | Optional text guiding the soundtrack. Name sounds the picture does not show, such as off-screen sounds or an ambience bed, to have them worked into it. · max 2000 chars · e.g. `Distant police sirens, tires screeching on asphalt` |
| `negative_prompt` | `string` | no | — | Sounds to keep out of the result, as a short comma-separated list. · max 1000 chars · e.g. `music, crowd noise` |
| `num_samples` | `integer` | no | `2` | Number of variations to generate. Billed per sample. · 1–4 |
| `preserve_speech` | `boolean` | no | `true` | Keep the speech in the input's audio and generate the rest of the soundtrack around it. False generates sound effects only and suppresses speech. |
| `seed` | `integer` | no | — | Seed for generation. -1 or None for random. · -1–18446744073709552000 |
| `video_url` | `string` | yes | — | Video to add sound to: an http(s) URL, or a base64 data URI up to 8 MB. · e.g. `https://di3otfzjg1gxa.cloudfront.net/chase.mp4` |
| `options` | `object` | no | — | Platform-specific options for safety checks and Picsart Drive integration. |
| └ `safety_checks` | `object` | no | — | Safety check configuration. |
| └   `enabled` | `boolean` | no | `true` | Enable or disable text safety checks. Defaults to true. |
| └ `drive` | `object` | no | — | Picsart Drive storage options. When provided, the result will be saved to the user's Drive. |
| └   `name` | `string` | yes | — | Filename to save the result as in Picsart Drive. |
| └   `attributes` | `object` | no | — | Additional file metadata attributes. |
| └   `folder` | `object` | no | — | Destination folder in Picsart Drive. |

### Example request body

```json
{
  "params": {
    "text_prompt": "Distant police sirens, tires screeching on asphalt",
    "video_url": "https://di3otfzjg1gxa.cloudfront.net/chase.mp4"
  }
}
```

### Usage examples

#### TypeScript (`ai.apis.run`)

```typescript
import { createClient, ApiRunMode } from '@picsart/ai-sdk';

const ai = createClient({
  apiKey: process.env.PICSART_API_KEY,
  apiUrl: 'https://api.picsart.com',
});

// Calls the 'mirelo-ai/sfx2.0/video-to-video' workflow directly — params are sent as-is.
const { result, usage } = await ai.apis.run('mirelo-ai/sfx2.0/video-to-video', {
  text_prompt: "Distant police sirens, tires screeching on asphalt",
  video_url: "https://di3otfzjg1gxa.cloudfront.net/chase.mp4"
}, {
  mode: ApiRunMode.SYNC,
});

console.log(result); // workflow-specific output
console.log(usage?.credits); // amount charged, in $
```

#### cURL (sync)

```bash
curl -X POST 'https://api.picsart.com/workflows/mirelo-ai/sfx2.0/video-to-video/execute' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "text_prompt": "Distant police sirens, tires screeching on asphalt",
    "video_url": "https://di3otfzjg1gxa.cloudfront.net/chase.mp4"
  }
}'
```

#### cURL (async: submit, then poll)

```bash
# 1. Submit the job
curl -X POST 'https://api.picsart.com/workflows/mirelo-ai/sfx2.0/video-to-video/submit' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "text_prompt": "Distant police sirens, tires screeching on asphalt",
    "video_url": "https://di3otfzjg1gxa.cloudfront.net/chase.mp4"
  }
}'
# → { "status": "success", "response": { "id": "wf_abc123" } }

# 2. Poll until response.status is COMPLETED
curl 'https://api.picsart.com/workflows/mirelo-ai/sfx2.0/video-to-video/wf_abc123/result' \
  -H 'Authorization: Bearer $PICSART_API_KEY'
```

### Response

Over HTTP the vendor-shaped result arrives inside the gateway envelope at `response.result`:

```json
{
  "status": "success",
  "response": {
    "id": "wf_abc123",
    "status": "COMPLETED",
    "result": {
      "model": "sfx-2.0",
      "video": [
        {
          "content_type": "video/mp4",
          "file_name": "generated_output_1.mp4",
          "url": "https://di3otfzjg1gxa.cloudfront.net/chase_output_1.mp4"
        }
      ]
    }
  }
}
```

`ai.apis.run()` unwraps that envelope and resolves to `{ result, usage }`:

```json
{
  "result": {
    "model": "sfx-2.0",
    "video": [
      {
        "content_type": "video/mp4",
        "file_name": "generated_output_1.mp4",
        "url": "https://di3otfzjg1gxa.cloudfront.net/chase_output_1.mp4"
      }
    ]
  }
}
```

## Additional resources

- Model page: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video
- Try it: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/playground
- SDK: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/sdk
- REST API (unified): https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/api
- Compatibility API (vendor parameters): https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/advanced
- Pricing: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/pricing
- This document: https://picsart.com/api-platform/models/mirelo-sfx-2.0-video-to-video/llms.txt
- All models: https://picsart.com/api-platform/models
- Docs — quickstart https://picsart.com/api-platform/docs/quickstart, authentication https://picsart.com/api-platform/docs/authentication, SDK https://picsart.com/api-platform/docs/sdk, REST https://picsart.com/api-platform/docs/api-reference, CLI https://picsart.com/api-platform/docs/cli, MCP https://picsart.com/api-platform/docs/mcp
- CLI reference: https://picsart.github.io/picsart-mcp-cli-docs/guide/introduction