### Install Impossible FX Go SDK

Source: https://impossible.io/docs/sdks

Install the SDK using go get. Requires Go 1.21+ and no external dependencies.

```bash
go get github.com/impossiblesoftware/impossible-fx-sdk/v3/go
```

--------------------------------

### Quick setup with FXPlayer

Source: https://impossible.io/docs/integrations/video-players

Include the player CSS and script, add a container div, and create a player with your project details. The player makes the render request, streams via HLS, and starts playback automatically.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>

<div id="player" style="width: 640px; height: 360px;"></div>

<script>
  const player = new fxplayer.FXPlayer("player", {
    impossible: {
      projectId: "YOUR-PROJECT-ID",
      movie: "welcome-video",
      params: {
        name: "Alex",
        company: "Acme Inc",
      },
    },
  });
  player.play();
</script>
```

--------------------------------

### GET /v2/get/{token}.{ext}

Source: https://impossible.io/docs/api-reference

Progressive download. Starts delivering as frames become available.

```APIDOC
## GET /v2/get/{token}.{ext}

### Description
Progressive download. Starts delivering as frames become available.

### Method
GET

### Endpoint
/v2/get/{token}.{ext}

### Parameters
#### Path Parameters
- **token** (string) - Required - The render token.
- **ext** (string) - Required - The file extension (e.g., mp4).

### Response
#### Success Response (200)
Returns the video file as it becomes available.
```

--------------------------------

### List all projects (cURL, Node, Python)

Source: https://impossible.io/docs/project-api

Returns a list of all projects in your account. The cURL example uses the GET /v1/list/project endpoint. The Node example uses the ImpossibleFX client with listProjects(). The Python example uses the impossiblefx client with list_projects().

```bash
curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://api-eu-west-1.impossible.io/v1/list/project
```

```javascript
import { ImpossibleFX } from "impossiblefx";

const client = new ImpossibleFX();
client.config.apikey = "YOUR_API_KEY";
client.config.region = "eu-west-1";

const projects = await client.listProjects();
```

```python
import impossiblefx as fx

client = fx.Client(
    api_key="YOUR_API_KEY",
    region="eu-west-1"
)

projects = client.list_projects()
```

--------------------------------

### Installation via NPM

Source: https://impossible.io/docs/integrations/video-players

Install the `fxplayer` package and import it in your code.

```bash
npm install fxplayer
```

```javascript
import { FXPlayer } from "fxplayer";
import "fxplayer/dist/fxplayer.css";
```

--------------------------------

### Delayed Start: Content Offset Example

Source: https://impossible.io/docs/editor/video-elements

Shows how to delay video playback while the element appears immediately. Set Element In Time to 0s and Content Offset to 2s to make the element visible right away but start the video after 2 seconds.

```plaintext
Element In Time: 0s
Content Offset: 2s
Result: Element visible immediately, video plays at 2s
```

--------------------------------

### Staggered Videos: Content Offset Example

Source: https://impossible.io/docs/editor/video-elements

Shows how to start multiple videos at different times. Set each video's In Time to 0s and use increasing Content Offset values (0s, 1s, 2s) so the videos appear together but play sequentially.

```plaintext
Video 1: In Time 0s, Offset 0s
Video 2: In Time 0s, Offset 1s
Video 3: In Time 0s, Offset 2s
Result: Videos appear together, play sequentially
```

--------------------------------

### fxplayer CTA overlays example

Source: https://impossible.io/docs/examples/fxplayer-cta

Complete HTML/JavaScript example that creates an fxplayer instance and adds three CTAs: a timed promo (5s-12s), a persistent subscribe pill (from 3s), and an end-screen with a sign-up button. Includes event listeners for CTA show/hide/click and hides timed CTAs when the video ends.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>

<div id="player" style="width: 720px; aspect-ratio: 16/9;"></div>

<script>
  const player = new fxplayer.FXPlayer('player', {
    src: 'https://www.w3schools.com/html/mov_bbb.mp4',
    controls: true,
  });

  // Timed CTA: show a promo between 5s and 12s
  player.addCTA('promo', {
    content: '<div class="promo-banner">50% Off</div>',
    startTime: 5,
    endTime: 12,
    position: 'center',
    dismissible: true,
  });

  // Persistent CTA: appears at 3s, stays until user closes
  player.addCTA('subscribe', {
    content: '<div class="subscribe-pill">Subscribe</div>',
    startTime: 3,
    position: 'bottom',
    dismissible: true,
  });

  // End-screen CTA: shown when video finishes
  const endScreen = document.createElement('div');
  endScreen.className = 'end-screen';
  endScreen.innerHTML = '<h2>Enjoyed the video?</h2>'
    + '<button onclick="alert(\'Signed up!\')">Sign Up</button>';

  player.addCTA('end-screen', {
    content: endScreen,
    position: 'center',
    pauseOnShow: true,
    dismissible: false,
  });

  // Hide timed CTAs when end-screen appears
  player.on('ended', () => {
    player.hideCTA('promo');
    player.hideCTA('subscribe');
  });

  // Events
  player.on('cta:show', (d) => console.log('CTA shown:', d.id));
  player.on('cta:hide', (d) => console.log('CTA hidden:', d.id));
  player.on('cta:click', (d) => console.log('CTA clicked:', d.id));
</script>
```

--------------------------------

### Transform examples

Source: https://impossible.io/docs/editor/variables

Examples of applying transforms to a variable value.

```text
{firstName|upper}
{firstName|title}
{firstName|substr(0,1)|upper|possessive}
```

--------------------------------

### GET /v1/list/sdl/{project-uid}

Source: https://impossible.io/docs/project-api

Lists all dynamic movies in a project.

```APIDOC
## GET /v1/list/sdl/{project-uid}

### Description
List all dynamic movies in a project.

### Method
GET

### Endpoint
/v1/list/sdl/{project-uid}

### Parameters
#### Path Parameters
- **project-uid** (string) - Required - The unique identifier of the project.

### Response
#### Success Response (200)
- **body** (array) - List of dynamic movies.

#### Response Example
[
  {
    "name": "welcome-video",
    "sdl": "..."
  }
]

```

--------------------------------

### GET /v1/list/data/{project-uid}

Source: https://impossible.io/docs/project-api

Lists all assets in a project.

```APIDOC
## [GET] /v1/list/data/{project-uid}

### Description
Returns a list of all assets in a project.

### Method
GET

### Endpoint
/v1/list/data/{project-uid}

### Parameters
#### Path Parameters
- **project-uid** (String) - Required - The unique project identifier.

### Request Example
```
curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://api-eu-west-1.impossible.io/v1/list/data/abc123-def456
```

### Response
#### Success Response (200)
- **assets** (array) - List of assets in the project.

#### Response Example
```
{
  "assets": [
    {
      "filename": "background.mp4",
      "size": 1234567
    }
  ]
}
```
```

--------------------------------

### GET /v1/list/project

Source: https://impossible.io/docs/project-api

Returns a list of all projects in your account.

```APIDOC
## GET /v1/list/project

### Description
Returns a list of all projects in your account.

### Method
GET

### Endpoint
/v1/list/project

### Parameters
None

### Request Example
curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://api-eu-west-1.impossible.io/v1/list/project

### Response
#### Success Response (200)
- **projects** (array) - List of projects

#### Response Example
{
  "projects": []
}
```

--------------------------------

### Date variable: Created on {date}

Source: https://impossible.io/docs/editor/text-elements

Date example using the {date} variable.

```plaintext
Created on {date}
```

--------------------------------

### Complete welcome video JSON

Source: https://impossible.io/docs/advanced/sdl

Complete example of a 10-second welcome video with a background video, a personalized text overlay with fade-in animation, a logo, and background music. It includes video and audio parameters, a scene with 250 frames, and multiple tracks.

```json
{
  "params": {
    "vparams": {
      "width": 1920,
      "height": 1080,
      "videocodec": "VIDEO_X264",
      "videobitrate": 5000,
      "videoframerate": { "num": 25, "den": 1 }
    },
    "aparams": {
      "audiocodec": "AUDIO_AAC",
      "audioabr": 128000,
      "audiosamplerate": 44100
    }
  },
  "scenes": [
    {
      "numframes": 250,
      "tracks": [
        {
          "content": {
            "type": "video",
            "source": { "path": "background.mp4" }
          },
          "transformations": [
            { "type": "scalingcrop", "scale": [1920, 1080] }
          ]
        },
        {
          "content": {
            "type": "textsimple",
            "source": { "path": "fonts/Montserrat-Bold.ttf" },
            "text": {
              "type": "format",
              "formatstring": "Welcome, {0}!",
              "formatvariables": [
                { "type": "map", "key": "name", "defaultvalue": "Friend" }
              ]
            },
            "fontsize_d": 72,
            "color": { "red": 255, "green": 255, "blue": 255 },
            "width": 1600,
            "height": 200,
            "xalignment": "centered",
            "yalignment": "middle"
          },
          "centerx": true,
          "y": 440,
          "opacity": 0.0,
          "opacityfunction": {
            "type": "linear",
            "param1": 0.0,
            "param2": 1.0,
            "innerfunction": {
              "type": "timed",
              "param1": 0.0,
              "param2": 0.15
            }
          }
        },
        {
          "content": {
            "type": "stillimage",
            "source": { "path": "logo.png" }
          },
          "x": 60,
          "y": 60
        }
      ],
      "audio": {
        "audiotracks": [
          {
            "type": "video_mix",
            "source": { "path": "music.mp4" },
            "volume": 0.4,
            "volumefunction": {
              "type": "linear",
              "param1": 0.0,
              "param2": 1.0,
              "innerfunction": {
                "type": "timed",
                "param1": 0.0,
                "param2": 0.08
              }
            }
          }
        ]
      }
    }
  ]
}
```

--------------------------------

### Installation via CDN

Source: https://impossible.io/docs/integrations/video-players

Include the player CSS and script from the CDN. No build step needed; the script adds `fxplayer.FXPlayer` to the global scope.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>
```

--------------------------------

### Video Sync Timing Pattern

Source: https://impossible.io/docs/editor/timeline

Sync captions to video by setting In Times that match when the speaker starts or reaches key points. The example shows a video starting at 0s, caption 1 at 2s, and caption 2 at 5s.

```text
Video: In 0s, no offset
Caption 1: In 2s (when speaker starts)
Caption 2: In 5s (next point)
```

--------------------------------

### Prompt to create a project and build a video

Source: https://impossible.io/docs/quickstart/mcp

Use this prompt to have the agent create a project and then build the video template. The agent will ask which region to create the project in.

```text
Create a project for this and build me a personalized insurance
premium quote video with FX Express. Three scenes: …
```

--------------------------------

### TypeScript Async Render with Progress Polling

Source: https://impossible.io/docs/sdks

Start an async render, get a token, build the URL, and poll for progress until the render completes.

```typescript
import { ImpossibleFX } from 'impossiblefx';

const client = new ImpossibleFX({
  region: 'us-east-1',
  apiKey: process.env.IMPOSSIBLE_API_KEY,
});

// Start an async render
const result = await client.render('my-project', 'welcome-video', {
  name: 'Alex',
}, { format: 'mp4', async: true });

console.log('Token:', result.token);

// Build the URL from the token
const url = client.getUrl(result.token, 'mp4');
console.log('URL:', url);

// Poll for progress (only available for async renders)
let progress = await client.getProgress(result.token);
while (progress.done < progress.total) {
  await new Promise((r) => setTimeout(r, 1000));
  progress = await client.getProgress(result.token);
  console.log(`Progress: ${progress.done}/${progress.total}`);
}

console.log('Render complete!');
```

--------------------------------

### TypeScript Quick Start - Synchronous Render

Source: https://impossible.io/docs/sdks

Initialize the client with region and API key, then perform a synchronous render that waits for completion and returns the URL.

```typescript
import { ImpossibleFX } from 'impossiblefx';

const client = new ImpossibleFX({
  region: 'us-east-1',
  apiKey: process.env.IMPOSSIBLE_API_KEY,
});

// Synchronous render — waits for completion and returns the URL
const result = await client.render('my-project', 'welcome-video', {
  name: 'Alex',
  company: 'Acme Inc',
}, { format: 'mp4' });

console.log(result.url);
```

--------------------------------

### Content Offset Example

Source: https://impossible.io/docs/editor/timeline

Shows how content offset shifts video playback relative to element visibility. With element at 0s and offset 2s, the element appears at 0s while video starts at 2s.

```text
Element In Time: 0s
Content Offset: 2s
Result: Element visible at 0s, video plays at 2s
```

--------------------------------

### Retrieve video with token-based URL

Source: https://impossible.io/docs/rendering

Use this URL to retrieve a rendered video with the token-based flow. The URL pattern is GET https://render.impossible.io/v2/{mode}/{token}.{format}. The example uses the render mode with an MP4 format.

```text
https://render.impossible.io/v2/render/v2:eu-west-1:abc123-def456-789.mp4
```

--------------------------------

### Product Demo Video Settings

Source: https://impossible.io/docs/editor/video-elements

Recommended settings for a product demo video: Object Fit Contain, not muted (or with voiceover), no loop, autoplay enabled.

```plaintext
Object Fit: Contain
Muted: No (or with voiceover)
Loop: No
Autoplay: Yes
```

--------------------------------

### Install ImpossibleFX Browser via NPM

Source: https://impossible.io/docs/sdks

Install the impossiblefx-browser package using npm.

```bash
npm install impossiblefx-browser
```

--------------------------------

### Install ImpossibleFX Python via pip

Source: https://impossible.io/docs/sdks

Install the impossible-fx package using pip. Requires Python 3.9+.

```bash
pip install impossible-fx
```

--------------------------------

### Python: Synchronous Render

Source: https://impossible.io/docs/sdks

Create a client with an API key and render a video synchronously, waiting for completion and printing the resulting URL.

```python
from impossible_fx import ImpossibleFX

client = ImpossibleFX(region="us-east-1", api_key="your-api-key")

# Synchronous render — waits for completion and returns the URL
result = client.render(
    project_id="my-project",
    movie="welcome-video",
    params={"name": "Alex", "company": "Acme Inc"},
    format="mp4",
)

print(result.url)
```

--------------------------------

### Impossible.io FXPlayer integration with constructor, setMovie, and setToken options

Source: https://impossible.io/docs/examples/fxplayer-impossible-io

Integrates the ImpossibleFX Render API into a web page. Loads the fxplayer v3 CSS and JavaScript from the CDN, creates a 16:9 container, and shows three ways to configure the player: via the constructor with projectId, movie, region, and params; by calling setMovie and setParams after construction; or by using setToken with a pre-existing token. The example uses start and end parameters to control the counter range.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>

<div id="player" style="width: 720px; aspect-ratio: 16/9;"></div>

<script>
  // Option A: Configure via constructor
  const player = new fxplayer.FXPlayer('player', {
    controls: true,
    impossible: {
      projectId: 'your-project-id',
      movie: 'your-movie-name',
      region: 'eu-west-1',
      params: { start: 0, end: 100 },
    },
  });
  player.play();

  // Option B: Set movie/params after construction
  const player2 = new fxplayer.FXPlayer('player', { controls: true });
  player2.setMovie('your-project-id', 'your-movie-name');
  player2.setParams({ start: 0, end: 100 });
  player2.play();

  // Option C: Play with a pre-existing token
  const player3 = new fxplayer.FXPlayer('player', { controls: true });
  player3.setToken('v2:eu-west-1:abc123');
  player3.play();
</script>
```

--------------------------------

### Initialize HLS stream with fxplayer

Source: https://impossible.io/docs/examples/fxplayer-hls

Sets up an HLS player with auto-format detection. Includes the fxplayer CSS and JS from CDN, a player div, and initialization with a sample HLS stream URL. Listens for 'ready' and 'error' events.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>

<div id="player" style="width: 720px; aspect-ratio: 16/9;"></div>

<script>
  const player = new fxplayer.FXPlayer('player', {
    src: 'https://test-streams.mux.dev/x36xhzz/x36xhzz.m3u8',
    controls: true,
  });

  player.on('ready', () => console.log('HLS stream ready'));
  player.on('error', (e) => console.error('Error:', e.message));
</script>
```

--------------------------------

### Install ImpossibleFX SDK (TypeScript/Node.js)

Source: https://impossible.io/docs/sdks

Install the official TypeScript/Node.js SDK for the Impossible FX Render API. Requires Node.js 18+.

```bash
npm install impossiblefx
```

--------------------------------

### FXPlayer with VTT tracks and dynamic addSubtitleTrack

Source: https://impossible.io/docs/examples/fxplayer-subtitles

Complete HTML/JavaScript example showing two players: one with subtitles configured at construction, and another where a subtitle track is added after initialization using addSubtitleTrack(). Includes CSS and JS CDN links.

```html
<link rel="stylesheet" href="https://cdn.impossible.io/fxplayer/v3/fxplayer.css" />
<script src="https://cdn.impossible.io/fxplayer/v3/fxplayer.js"></script>

<!-- Player 1: VTT track at construction -->
<div id="player1" style="width: 720px; aspect-ratio: 16/9;"></div>

<script>
  const player1 = new fxplayer.FXPlayer('player1', {
    src: 'https://example.com/video.mp4',
    controls: true,
    subtitles: {
      storageKey: 'myapp',
      tracks: [
        { src: 'captions-en.vtt', srclang: 'en', label: 'English', default: true },
        { src: 'captions-es.vtt', srclang: 'es', label: 'Spanish' },
      ],
    },
  });
</script>

<!-- Player 2: Add track dynamically -->
<div id="player2" style="width: 720px; aspect-ratio: 16/9;"></div>

<script>
  const player2 = new fxplayer.FXPlayer('player2', {
    src: 'https://example.com/video.mp4',
    controls: true,
    subtitles: { storageKey: 'myapp_dynamic' },
  });

  // Add a subtitle track after initialization
  player2.addSubtitleTrack({
    src: 'https://example.com/captions-en.vtt',
    srclang: 'en',
    label: 'English',
    default: true,
  });
</script>
```

--------------------------------

### Create a project (cURL)

Source: https://impossible.io/docs/project-api

Creates a new empty project with the given name. The name is a URL path parameter and must be unique within your account. The response includes the project UID for subsequent calls.

```bash
curl -X POST -H "Authorization: Bearer YOUR_API_KEY" \
  https://api-eu-west-1.impossible.io/v1/project/my-new-project
```

--------------------------------

### Example Video URL Response from Webhook

Source: https://impossible.io/docs/integrations/others

Example JSON response returned by the Respond to Webhook node, containing the constructed video URL.

```json
{
  "videoUrl": "https://render.impossible.io/v2/render/v2:eu-west-1:abc123.mp4"
}
```