Video Translator Chrome Extension

A Chrome extension that provides real-time translation and subtitle generation for any video or audio content on the web. Unlike existing text-only translation tools, this extension detects audio from videos across all websites, transcribes the speech, translates it to your preferred language, and displays synchronized subtitles overlaid on the video content.

🚀 Features

• Universal Video Support: Works on any website with video content (YouTube, Netflix, news sites, etc.)
• Real-time Translation: Live speech recognition and translation with minimal delay
• Customizable Subtitles: Adjustable font size, color, position, and styling
• Multi-language Support: Translate to/from multiple languages
• Smart Synchronization: Subtitles appear within 2 seconds of spoken audio
• Privacy-focused: Audio processing happens locally or through secure connections
• Cross-platform Compatibility: Works across different video platforms and formats

📋 Current Status

Development Progress: ~42% Complete (5/12 major tasks)

✅ Completed Components

• Chrome extension project structure and manifest
• Video detection system with MutationObserver
• Audio processing and speech recognition
• Translation service with API integration
• Subtitle rendering and overlay system
• Comprehensive test suite (164 passing tests)

🔄 In Progress

• User interface integration
• Background script development
• Content script orchestration
• Error handling and user feedback
• Security and privacy features
• Performance optimization

🏗️ Architecture

The extension follows a modular architecture with clear separation of concerns:

├── content/                 # Content scripts (injected into web pages)
│   ├── videoDetector.js    # Detects video elements on pages
│   ├── audioProcessor.js   # Captures and processes audio streams
│   ├── speechRecognizer.js # Speech-to-text conversion
│   ├── translationService.js # Translation API integration
│   ├── subtitleRenderer.js # Creates and positions subtitle overlays
│   ├── subtitleTimer.js    # Handles subtitle timing and synchronization
│   └── subtitleStyleManager.js # Manages subtitle appearance
├── background/             # Background service worker
├── popup/                  # Extension popup interface
├── options/               # Settings and configuration page
└── tests/                 # Comprehensive test suite

🛠️ Development Setup

Prerequisites

• Node.js (v14 or higher)
• Chrome browser
• Git

Installation

1. Clone the repository:

git clone https://github.com/xignoe/videoTranslatorExtenstion.git
cd videoTranslatorExtenstion

2. Install dependencies:

npm install

3. Run tests:

npm test

Loading in Chrome for Development

1. Open Chrome and navigate to chrome://extensions/
2. Enable "Developer mode" in the top right
3. Click "Load unpacked" and select the project directory
4. The extension will appear in your extensions list

🧪 Testing

The project includes comprehensive test coverage:

# Run all tests
npm test

# Run specific test suites
npm test subtitleRenderer
npm test translationService
npm test videoDetector

# Run tests with coverage
npm test -- --coverage

Test Coverage: 164 passing tests covering:

• Video detection across platforms
• Audio processing and speech recognition
• Translation service with retry logic
• Subtitle rendering and timing
• Style management and customization

📖 Usage

For Users

1. Install the extension in Chrome
2. Navigate to any website with video content
3. Click the extension icon to configure your target language
4. Play a video - subtitles will automatically appear
5. Customize subtitle appearance in the options page

For Developers

The extension is built with a modular architecture that makes it easy to:

• Add new translation providers
• Support additional video platforms
• Customize subtitle rendering
• Extend audio processing capabilities

🔧 Configuration

Translation Settings

• Target language selection
• Source language detection
• Translation confidence thresholds

Subtitle Appearance

• Font size, color, and family
• Background color and opacity
• Position (top, center, bottom)
• Animation and timing settings

🏛️ Technical Details

Core Technologies

• Chrome Extension Manifest V3
• Web Audio API for audio capture
• Web Speech API for speech recognition
• Translation APIs for language conversion
• DOM Manipulation for subtitle overlay

Key Features

• Real-time Processing: Minimal latency between speech and subtitles
• Memory Management: Efficient cleanup and resource management
• Error Handling: Comprehensive error recovery and user feedback
• Cross-origin Support: Works with embedded videos and iframes
• Performance Optimized: Minimal impact on video playback

🤝 Contributing

We welcome contributions! Here's how to get started:

1. Fork the repository
2. Create a feature branch: git checkout -b feature-name
3. Make your changes and add tests
4. Run the test suite: npm test
5. Commit your changes: git commit -m 'Add feature'
6. Push to your branch: git push origin feature-name
7. Submit a pull request

Development Guidelines

• Follow the existing code style and architecture
• Add tests for new functionality
• Update documentation as needed
• Ensure all tests pass before submitting

📝 Project Structure

video-translator-extension/
├── .kiro/specs/           # Project specifications and requirements
├── background/            # Background service worker
├── content/              # Content scripts and core functionality
├── icons/               # Extension icons
├── options/             # Options page (settings)
├── popup/               # Extension popup interface
├── tests/               # Test suite
├── manifest.json        # Chrome extension manifest
├── package.json         # Node.js dependencies and scripts
└── README.md           # This file

🔒 Privacy & Security

• Audio data is processed locally or through secure, encrypted connections
• No audio data is stored permanently
• User preferences are stored locally using Chrome's storage API
• Extension only accesses audio from active video tabs
• Automatic cleanup when tabs are closed or extension is disabled

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🐛 Known Issues

• Some speech recognition tests need mock setup fixes
• Translation service queue tests have timing issues
• Content script orchestration is not yet implemented
• Background script functionality is minimal

🗺️ Roadmap

Phase 1 (Current)

• Core component development
• Individual component testing
• Component integration

Phase 2 (Next)

• User interface completion
• End-to-end functionality
• Cross-platform testing

Phase 3 (Future)

• Performance optimization
• Additional language support
• Advanced subtitle features
• Chrome Web Store publication

📞 Support

If you encounter any issues or have questions:

1. Check the Issues page
2. Create a new issue with detailed information
3. Include browser version, extension version, and steps to reproduce

🙏 Acknowledgments

• Chrome Extension APIs and documentation
• Web Speech API for speech recognition capabilities
• Translation service providers
• Open source testing frameworks (Jest, JSDOM)

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Note: This extension is currently in active development. Core functionality is implemented and tested, but integration work is ongoing. See the project tasks for detailed progress tracking.