792 lines
No EOL
24 KiB
Markdown
792 lines
No EOL
24 KiB
Markdown
# Video Accessibility Processing Platform - Software Specification
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## 1. Executive Summary
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The Video Accessibility Processing Platform is a comprehensive web application designed to automatically generate closed captions and audio descriptions for video content using artificial intelligence. The platform provides a complete workflow from video upload through AI processing, human quality control, multi-language translation, and final content delivery.
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**Core Capabilities:**
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- Automated generation of closed captions and audio descriptions using Google Gemini 2.5 Pro
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- Multi-language translation and transcreation services
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- Professional quality control workflow for reviewers
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- Text-to-speech generation for audio descriptions
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- Role-based access control for clients, reviewers, and administrators
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- Real-time job status updates via WebSocket connections
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- Secure file storage and signed URL download system
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**Target Users:**
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- **Clients**: Organizations needing video accessibility services
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- **Reviewers**: Professional accessibility specialists who review and approve content
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- **Administrators**: System administrators managing users and system operations
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## 2. System Architecture
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### 2.1 Technology Stack
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**Frontend:**
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- React 18 with TypeScript
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- Vite for build tooling
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- TanStack Query for state management
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- React Router for navigation
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- Tailwind CSS for styling
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**Backend:**
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- FastAPI (Python 3.11+) for REST API
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- Celery with Redis for background task processing
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- MongoDB Atlas for data storage
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- JWT authentication with HttpOnly refresh cookies
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**External Services:**
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- Google Cloud Storage for file storage
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- Google Gemini 2.5 Pro for AI processing
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- Google Cloud Translate for language translation
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- ElevenLabs for text-to-speech synthesis
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**Infrastructure:**
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- Docker containerization
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- Redis for caching and task queues
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- WebSocket support for real-time updates
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### 2.2 System Components
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```
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┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
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│ React SPA │ │ FastAPI │ │ Celery │
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│ Frontend │◄──►│ Backend │◄──►│ Workers │
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└─────────────────┘ └─────────────────┘ └─────────────────┘
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│ │
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▼ ▼
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┌─────────────────┐ ┌─────────────────┐
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│ MongoDB │ │ Redis │
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│ Database │ │ Queue/Cache │
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└─────────────────┘ └─────────────────┘
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│
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▼
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┌─────────────────┐
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│ Google Cloud │
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│ Storage │
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└─────────────────┘
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```
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## 3. User Roles and Access Control
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### 3.1 Role Definitions
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**Client Role:**
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- Upload videos and create processing jobs
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- View own job status and progress
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- Download completed accessibility assets
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- Limited to own content only
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**Reviewer Role:**
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- Access quality control dashboard
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- Review AI-generated content for accuracy
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- Edit VTT files (captions and audio descriptions)
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- Approve or reject English content
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- Perform final review of completed jobs
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- Access to all jobs in system
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**Admin Role:**
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- Full system access including all reviewer capabilities
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- User management (create, edit, deactivate users)
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- System monitoring and health checks
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- Bulk operations and maintenance tasks
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- Access to audit logs and system statistics
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### 3.2 Authentication System
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**JWT Token Management:**
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- Access tokens stored in memory (15-minute expiry)
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- Refresh tokens stored in HttpOnly cookies (7-day expiry)
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- Automatic token refresh for active sessions
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- Secure logout with cookie clearing
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**Security Features:**
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- Password hashing using bcrypt
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- CORS protection with configurable origins
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- Rate limiting on authentication endpoints
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- Session-based security with proper token rotation
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## 4. Job Processing Workflow
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### 4.1 Job Status State Machine
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The system implements a comprehensive state machine for tracking job progress:
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```
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created → ingesting → ai_processing → pending_qc → approved_english → translating → tts_generating → pending_final_review → completed
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↓
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rejected → (manual intervention required)
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↓
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qc_feedback → (back to pending_qc after fixes)
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```
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**Status Definitions:**
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- **created**: Job record created, video uploaded to storage
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- **ingesting**: Video being processed for metadata extraction
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- **ai_processing**: AI analyzing video content and generating captions/audio descriptions
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- **pending_qc**: Awaiting human quality control review
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- **approved_english**: English content approved, ready for translation
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- **rejected**: Content rejected, requires client revision
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- **qc_feedback**: Reviewer provided feedback, awaiting fixes
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- **translating**: Processing multi-language translations
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- **tts_generating**: Generating audio files from text descriptions
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- **pending_final_review**: All content ready, awaiting final approval
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- **completed**: Job finished, all assets available for download
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### 4.2 Processing Pipeline
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**Phase 1: Upload and Ingestion**
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1. Client uploads MP4 video file through web interface
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2. File stored in Google Cloud Storage with unique job ID path
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3. Job record created in MongoDB with metadata
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4. Background Celery task queued for processing
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**Phase 2: AI Content Generation**
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1. Video file sent to Google Gemini 2.5 Pro API
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2. AI generates:
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- Plain text transcript
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- Closed captions in WebVTT format
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- Audio description script in WebVTT format
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- Confidence score for generated content
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3. Generated content stored in GCS and linked to job
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4. Job status updated to `pending_qc`
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**Phase 3: Quality Control Review**
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1. Reviewer accesses job through QC dashboard
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2. Side-by-side video player with generated captions/audio descriptions
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3. Inline VTT editor for making corrections
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4. Timing adjustment tools for synchronization
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5. Approve or reject with reviewer notes
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6. If approved, job moves to translation phase
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**Phase 4: Translation and Localization**
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1. Automatic translation of approved English content
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2. Support for standard translation and cultural transcreation
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3. Available target languages: Spanish, French, German (expandable)
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4. Translated VTT files stored per language
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**Phase 5: Audio Generation**
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1. Text-to-speech synthesis using ElevenLabs API
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2. MP3 files generated for each audio description track
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3. Language-specific voice selection
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4. Audio files stored alongside VTT content
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**Phase 6: Final Review and Delivery**
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1. Final review by authorized reviewer
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2. Asset validation to ensure all requested outputs present
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3. Client notification of job completion
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4. Signed URL generation for secure downloads
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## 5. User Interface and Experience
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### 5.1 Client Workflow
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**Dashboard:**
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- Overview of all jobs with status indicators
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- Quick actions for creating new jobs
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- Real-time status updates via WebSocket
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- Notification system for job completion
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**Job Creation Process:**
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1. **Video Upload**: Drag-and-drop interface with progress tracking
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2. **Job Configuration**:
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- Descriptive title
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- Source language selection
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- Output format selection (captions VTT, audio description VTT, audio MP3)
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- Target languages for translation
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3. **Processing Initiation**: Automatic background processing begins
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4. **Confirmation**: Success page with job tracking link
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**Job Monitoring:**
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- Detailed status view with progress indicators
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- Processing history timeline
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- Real-time updates without page refresh
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- Error notifications with context
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**Content Download:**
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- Secure download links for completed assets
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- Organized by language (en/, es/, fr/, de/)
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- File format options (VTT, MP3)
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- Source video access
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### 5.2 Reviewer Workflow
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**Quality Control Dashboard:**
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- Queue view of jobs pending review
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- Priority sorting by creation date
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- Job metadata preview
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- Quick status filtering
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**Review Interface:**
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- **Video Player**: HTML5 player with custom controls
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- **VTT Editor**: Syntax-highlighted editor with validation
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- **Side-by-Side View**: Simultaneous video and text editing
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- **Timing Tools**: Bulk timing adjustment with offset controls
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- **Review Controls**: Approve/reject with mandatory notes
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**Advanced Features:**
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- Keyboard shortcuts for efficient workflow (A=Approve, R=Reject, S=Save)
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- View mode switching (side-by-side, video-only, editor-only)
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- Real-time VTT validation and error highlighting
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- Unsaved changes warnings
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**Final Review Process:**
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- Asset validation before completion
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- Final quality checks
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- Client notification triggering
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- Completion workflow
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### 5.3 Administrator Interface
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**User Management:**
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- Create users with role assignment
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- Password reset functionality
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- User activation/deactivation
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- Role-based permission enforcement
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**System Monitoring:**
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- Health check dashboard with component status
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- Job processing statistics and metrics
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- Queue monitoring for background tasks
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- Performance analytics
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**Audit and Security:**
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- Comprehensive audit logging
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- Security event monitoring
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- User activity tracking
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- System maintenance tools
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## 6. Data Models and Storage
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### 6.1 Job Data Structure
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```typescript
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interface Job {
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id: string; // Unique job identifier
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client_id: string; // Owner client ID
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title: string; // Human-readable job name
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status: JobStatus; // Current processing status
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source: {
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filename: string; // Storage path
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original_filename: string; // User's original filename
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gcs_uri: string; // Google Cloud Storage URI
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duration_s: number; // Video duration in seconds
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language: string; // Source language code
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};
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requested_outputs: {
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captions_vtt: boolean; // Closed captions requested
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audio_description_vtt: boolean; // Audio description script requested
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audio_description_mp3: boolean; // Audio voiceover requested
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languages: string[]; // Target languages
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transcreation: string[]; // Languages requiring cultural adaptation
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};
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outputs: {
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[language: string]: {
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captions_vtt_gcs?: string; // VTT file location
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ad_vtt_gcs?: string; // Audio description VTT location
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ad_mp3_gcs?: string; // Audio MP3 file location
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origin: "translate" | "transcreate"; // Processing method
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qa_notes?: string; // Quality assurance notes
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};
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};
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ai: {
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ingestion_json: object; // Full AI response data
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confidence: number; // AI confidence score (0-1)
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};
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review: {
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notes: string; // Current reviewer notes
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reviewer_id?: string; // Last reviewer ID
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history: ReviewHistoryItem[]; // Complete review history
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};
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created_at: Date;
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updated_at: Date;
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error?: ErrorInfo; // Processing error details
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}
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```
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### 6.2 User Data Structure
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```typescript
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interface User {
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id: string;
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email: string; // Unique login identifier
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hashed_password: string; // Bcrypt hashed password
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full_name: string; // Display name
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role: "client" | "reviewer" | "admin";
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is_active: boolean; // Account status
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created_at: Date;
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updated_at: Date;
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}
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```
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### 6.3 File Storage Organization
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**Google Cloud Storage Bucket Structure:**
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```
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gs://accessible-video/
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├── {jobId}/
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│ ├── source.mp4 # Original video
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│ ├── en/
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│ │ ├── captions.vtt # English captions
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│ │ ├── ad.vtt # English audio description
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│ │ └── ad.mp3 # English audio file
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│ ├── es/
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│ │ ├── captions.vtt # Spanish captions
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│ │ ├── ad.vtt # Spanish audio description
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│ │ └── ad.mp3 # Spanish audio file
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│ └── [other languages]/
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└── health_check_dummy # System health verification
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```
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**Security Features:**
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- Signed URLs with 24-hour expiration
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- Role-based access control
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- Automatic cleanup on job deletion
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- Secure upload with content-type validation
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## 7. API Design
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### 7.1 Authentication Endpoints
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```
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POST /api/v1/auth/login
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POST /api/v1/auth/refresh
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POST /api/v1/auth/logout
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```
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### 7.2 Job Management Endpoints
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```
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POST /api/v1/jobs # Create new job
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GET /api/v1/jobs # List jobs (filtered by role)
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GET /api/v1/jobs/{id} # Get job details
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DELETE /api/v1/jobs/{id} # Delete job
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DELETE /api/v1/jobs/bulk # Bulk delete (admin only)
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# Job Actions
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POST /api/v1/jobs/{id}/actions/approve_english
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POST /api/v1/jobs/{id}/actions/reject
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POST /api/v1/jobs/{id}/actions/complete
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POST /api/v1/jobs/{id}/actions/reject_final
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# Content Management
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GET /api/v1/jobs/{id}/vtt # Get VTT content
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PATCH /api/v1/jobs/{id}/vtt # Update VTT content
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POST /api/v1/jobs/{id}/vtt/adjust-timing # Adjust timing
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GET /api/v1/jobs/{id}/downloads # Get download URLs
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GET /api/v1/jobs/{id}/validate # Validate assets
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```
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### 7.3 Administrative Endpoints
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```
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# User Management
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GET /api/v1/admin/users
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POST /api/v1/admin/users
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GET /api/v1/admin/users/{id}
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PATCH /api/v1/admin/users/{id}
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DELETE /api/v1/admin/users/{id}
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# System Monitoring
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GET /api/v1/admin/stats
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GET /api/v1/admin/health/detailed
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GET /api/v1/admin/jobs/stats
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GET /api/v1/admin/audit-logs
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```
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### 7.4 File Management
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```
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GET /api/v1/files/signed-url/{path} # Generate signed download URL
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POST /api/v1/files/upload # Direct file upload endpoint
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```
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### 7.5 Real-time Updates
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**WebSocket Endpoints:**
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- `/ws/jobs` - General job status updates
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- `/ws/jobs/{job_id}` - Job-specific status updates
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**WebSocket Message Format:**
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```json
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{
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"job_id": "string",
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"status": "string",
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"updated_at": "ISO8601",
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"job_title": "string",
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"message": "string",
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"progress": "number"
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}
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```
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## 8. AI Services Integration
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### 8.1 Google Gemini 2.5 Pro Integration
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**Content Generation Capabilities:**
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- Video content analysis and understanding
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- Automatic transcript generation
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- Closed caption creation with proper timing
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- Audio description generation for visual elements
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- Content confidence scoring
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**Processing Flow:**
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1. Video upload to Gemini Files API
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2. Content generation using multimodal prompt
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3. Structured JSON response parsing
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4. Error handling and self-healing for invalid responses
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5. Automatic file cleanup after processing
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**Quality Assurance:**
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- VTT format validation
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- Timestamp accuracy verification
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- Content completeness checks
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- Fallback content generation for missing elements
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### 8.2 Translation Services
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**Google Cloud Translate:**
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- High-quality machine translation for standard content
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- Support for multiple target languages
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- VTT format preservation during translation
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- Batch processing for efficiency
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**Transcreation via Gemini:**
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- Cultural adaptation for marketing content
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- Context-aware translation with brand guidelines
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- Maintained timing synchronization
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- Creative adaptation while preserving meaning
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### 8.3 Text-to-Speech Integration
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**ElevenLabs TTS Service:**
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- High-quality voice synthesis
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- Language-specific voice selection
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- MP3 output format
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- Proper pronunciation for accessibility terms
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**Audio Processing:**
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- Per-cue synthesis for precise timing
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- Audio quality optimization
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- File format standardization
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- Integration with VTT timing
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## 9. Quality Control Features
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### 9.1 Review Workflow
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**Content Review Process:**
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1. **Initial Review**: AI-generated content assessment
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2. **Content Editing**: Direct VTT file modification
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3. **Synchronization Check**: Video timing validation
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4. **Quality Verification**: Accessibility standards compliance
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5. **Final Approval**: Content ready for translation
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**Review Tools:**
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- Integrated video player with caption overlay
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- Syntax-highlighted VTT editor
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- Real-time content validation
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- Timing adjustment utilities
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- Review history tracking
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### 9.2 Quality Metrics
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**AI Confidence Scoring:**
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- Content generation confidence (0-100%)
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- Quality indicators for reviewer guidance
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- Threshold-based workflow routing
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**Review Analytics:**
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- Processing time tracking
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- Reviewer performance metrics
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- Quality score trending
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- Error rate monitoring
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## 10. Security and Compliance
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### 10.1 Data Security
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**Authentication Security:**
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- JWT token-based authentication
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- HttpOnly cookie refresh tokens
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- Automatic token rotation
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- Secure password hashing (bcrypt)
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**File Security:**
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- Signed URL access control
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- Time-limited download permissions
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- Secure file upload validation
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- Automatic cleanup procedures
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**API Security:**
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- CORS protection
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- Rate limiting
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- Input validation and sanitization
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- SQL injection prevention (NoSQL)
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### 10.2 Privacy Protection
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**Data Handling:**
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- Client data isolation
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- Role-based access enforcement
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- Audit trail maintenance
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- Secure data deletion
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**Content Protection:**
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- Temporary file processing
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- Secure cloud storage
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- Access logging
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- Data retention policies
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### 10.3 Audit and Compliance
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**Audit Logging:**
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- User action tracking
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- System event logging
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- Security event monitoring
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- Performance metric collection
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**Compliance Features:**
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- Data export capabilities
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- User consent management
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- Access control documentation
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- Security incident tracking
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## 11. Performance and Scalability
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### 11.1 System Performance
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**Backend Performance:**
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- Async request handling with FastAPI
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- Background task processing via Celery
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- Database query optimization
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- Caching strategy with Redis
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**Frontend Performance:**
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- React Query for data caching
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- Lazy loading of components
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- Optimized bundle splitting
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- Progressive web app features
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### 11.2 Scalability Architecture
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**Horizontal Scaling:**
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- Stateless API servers
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- Independent worker processes
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- Load balancing ready
|
|
- Database connection pooling
|
|
|
|
**Resource Optimization:**
|
|
- File compression and optimization
|
|
- CDN integration ready
|
|
- Memory-efficient processing
|
|
- Garbage collection optimization
|
|
|
|
### 11.3 Monitoring and Observability
|
|
|
|
**Health Monitoring:**
|
|
- Component health checks
|
|
- Service dependency monitoring
|
|
- Performance metric collection
|
|
- Error rate tracking
|
|
|
|
**Logging and Debugging:**
|
|
- Structured logging with correlation IDs
|
|
- Error tracking and alerting
|
|
- Performance profiling
|
|
- Debug mode capabilities
|
|
|
|
## 12. Deployment and Infrastructure
|
|
|
|
### 12.1 Containerization
|
|
|
|
**Docker Configuration:**
|
|
- Multi-stage builds for optimization
|
|
- Health check integration
|
|
- Environment-based configuration
|
|
- Security-hardened images
|
|
|
|
### 12.2 Environment Configuration
|
|
|
|
**Development Environment:**
|
|
- Local Docker Compose setup
|
|
- Hot-reload development servers
|
|
- Test database seeding
|
|
- Mock external services
|
|
|
|
**Production Environment:**
|
|
- Cloud-native deployment
|
|
- SSL/TLS termination
|
|
- Environment variable management
|
|
- Secret management integration
|
|
|
|
### 12.3 Database Management
|
|
|
|
**MongoDB Configuration:**
|
|
- Document schema validation
|
|
- Index optimization
|
|
- Replica set support
|
|
- Backup and recovery procedures
|
|
|
|
**Migration System:**
|
|
- Schema version tracking
|
|
- Safe migration procedures
|
|
- Rollback capabilities
|
|
- Data integrity validation
|
|
|
|
## 13. Testing Strategy
|
|
|
|
### 13.1 Testing Levels
|
|
|
|
**Unit Testing:**
|
|
- Service layer testing
|
|
- Utility function testing
|
|
- Component testing
|
|
- Mock external dependencies
|
|
|
|
**Integration Testing:**
|
|
- API endpoint testing
|
|
- Database integration testing
|
|
- File storage integration
|
|
- Authentication flow testing
|
|
|
|
**End-to-End Testing:**
|
|
- Complete user workflow testing
|
|
- Cross-browser compatibility
|
|
- Mobile responsiveness
|
|
- Performance testing
|
|
|
|
### 13.2 Testing Tools
|
|
|
|
**Backend Testing:**
|
|
- PyTest for unit and integration tests
|
|
- Factory Boy for test data generation
|
|
- Async test support
|
|
- Mock external services
|
|
|
|
**Frontend Testing:**
|
|
- Jest for unit testing
|
|
- React Testing Library
|
|
- Playwright for E2E testing
|
|
- Visual regression testing
|
|
|
|
## 14. Error Handling and Recovery
|
|
|
|
### 14.1 Error Classification
|
|
|
|
**User Errors:**
|
|
- Invalid file formats
|
|
- Insufficient permissions
|
|
- Validation failures
|
|
- Authentication errors
|
|
|
|
**System Errors:**
|
|
- External service failures
|
|
- Database connection issues
|
|
- File storage problems
|
|
- Processing timeouts
|
|
|
|
**Recovery Strategies:**
|
|
- Automatic retry mechanisms
|
|
- Graceful degradation
|
|
- User-friendly error messages
|
|
- Administrative error resolution
|
|
|
|
### 14.2 Reliability Features
|
|
|
|
**Fault Tolerance:**
|
|
- Circuit breaker patterns
|
|
- Timeout configurations
|
|
- Retry logic with exponential backoff
|
|
- Fallback procedures
|
|
|
|
**Data Integrity:**
|
|
- Transaction management
|
|
- Consistent state handling
|
|
- Backup and recovery
|
|
- Data validation
|
|
|
|
## 15. Configuration and Customization
|
|
|
|
### 15.1 System Configuration
|
|
|
|
**Application Settings:**
|
|
- Environment-specific configurations
|
|
- Feature flag support
|
|
- Service endpoint configuration
|
|
- Security parameter tuning
|
|
|
|
**Processing Configuration:**
|
|
- AI model parameters
|
|
- Translation service options
|
|
- File size limits
|
|
- Processing timeouts
|
|
|
|
### 15.2 User Customization
|
|
|
|
**Client Settings:**
|
|
- Language preferences
|
|
- Notification preferences
|
|
- Default job settings
|
|
- Download preferences
|
|
|
|
**Reviewer Settings:**
|
|
- Workflow preferences
|
|
- Editor configurations
|
|
- Keyboard shortcuts
|
|
- Quality thresholds
|
|
|
|
## 16. Future Enhancements
|
|
|
|
### 16.1 Planned Features
|
|
|
|
**Enhanced AI Capabilities:**
|
|
- Multi-modal content analysis
|
|
- Improved accuracy metrics
|
|
- Custom model training
|
|
- Advanced quality scoring
|
|
|
|
**Extended Language Support:**
|
|
- Additional target languages
|
|
- Regional dialect support
|
|
- Custom transcreation workflows
|
|
- Cultural adaptation tools
|
|
|
|
**Advanced Workflow Features:**
|
|
- Batch processing capabilities
|
|
- Template-based job creation
|
|
- Advanced approval workflows
|
|
- Custom review stages
|
|
|
|
### 16.2 Integration Opportunities
|
|
|
|
**Third-Party Integrations:**
|
|
- Content management systems
|
|
- Video hosting platforms
|
|
- Accessibility testing tools
|
|
- Quality assurance services
|
|
|
|
**API Extensions:**
|
|
- Webhook support for job events
|
|
- Advanced reporting APIs
|
|
- Bulk operation endpoints
|
|
- Custom integration points
|
|
|
|
## 17. Conclusion
|
|
|
|
The Video Accessibility Processing Platform represents a comprehensive solution for automated video accessibility content generation. Built with modern web technologies and integrated with leading AI services, the platform provides an end-to-end workflow from video upload to final content delivery.
|
|
|
|
The system's architecture supports scalability, security, and reliability while maintaining a focus on user experience and content quality. The role-based access control ensures appropriate separation of concerns between content creators, quality reviewers, and system administrators.
|
|
|
|
With its robust API design, real-time updates, and comprehensive error handling, the platform serves as a professional-grade solution for organizations requiring high-quality accessibility content at scale.
|
|
|
|
---
|
|
|
|
*This specification document serves as the comprehensive technical and functional guide for the Video Accessibility Processing Platform, detailing all implemented features, workflows, and system capabilities as of the current release.* |