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@@ -1,12 +1,18 @@
 # Video Query Tool
 
-A full-stack web application that processes videos using Google's Gemini AI model, allowing users to upload multiple videos simultaneously and receive AI-generated content based on customizable prompts. Features parallel processing, automatic video splitting, Azure AD B2C authentication, chunked file uploads, PDF generation with Mermaid diagrams, and comprehensive usage tracking.
+A full-stack web application that processes videos using Google's Gemini AI model with dual processing modes (Single Video and Batch). Features intelligent two-stage synthesis, automatic video splitting, Azure AD B2C authentication, chunked file uploads up to 5GB, PDF generation with merged Mermaid diagrams, and comprehensive usage tracking.
 
 ## Features
 
 ### Core Functionality
-- **Video Processing**: Upload and analyze videos using Google Gemini 2.0 Flash Exp AI model
-- **Multiple Processing Modes**:
+- **Dual Processing Modes**:
+  - **Single Video Mode**: Process videos individually with per-video control
+  - **Batch Mode**: Combine multiple related videos (up to 10) for unified analysis
+- **Intelligent AI Synthesis**: Two-stage processing ensures seamless results
+  - Stage 1: Each video/chunk → concise summary
+  - Stage 2: All summaries → unified cohesive result
+- **Video Processing**: Upload and analyze using Google Gemini 2.0 Flash Exp AI model
+- **Prompt Templates**:
   - Meeting Summary
   - Process/Tool Documentation
   - Process Documentation with Mermaid Charts
@@ -14,19 +20,22 @@ A full-stack web application that processes videos using Google's Gemini AI mode
 - **Large File Support**: Chunked upload system supporting files up to 5GB per file
 - **PDF Generation**: Convert results to PDF with embedded Mermaid diagrams
 - **Authentication**: Azure AD B2C integration (optional, controlled via .env)
-- **Parallel Processing**: Process up to 2 videos simultaneously
-- **Multiple File Upload**: Upload and queue multiple videos at once
+- **Parallel Processing**: Process up to 2 videos simultaneously (single mode)
 - **Long Video Support**: Automatic splitting and parallel chunk processing for videos > 54 minutes
 
 ### Technical Features
+- **Explicit User Control**: No auto-processing - all videos require explicit "Process" button click
+- **Batch Video Management**: Reorder, arrange, and remove videos before processing
+- **Smart Diagram Merging**: Multiple Mermaid diagrams intelligently combined into one
+- **Persistent Mode Selection**: Processing mode and batch queue persist across page refreshes
 - **Multiple File Queue**: Upload multiple videos, manage queue (Stop, Retry, Remove)
 - **Drag & Drop Upload**: Modern file upload interface with progress tracking
-- **Real-time Processing**: Live status updates with parallel processing indicators
+- **Real-time Status**: Live status updates (uploading → uploaded → processing → completed)
 - **Queue Management**: Stop, retry, or remove videos from processing queue anytime
 - **Automatic Video Splitting**: Videos > 54 minutes automatically split into 54-min chunks
 - **Rate Limiting**: Built-in API rate limiting (2-second delay) to prevent quota errors
 - **Error Handling**: Comprehensive error handling with retry capability
-- **Processing Time Display**: Shows processing duration for each completed video
+- **Processing Time Display**: Shows processing duration for each completed video/batch
 - **Usage Analytics**: Automated tracking via webhook integration
 - **Production Ready**: Systemd service configuration and deployment scripts
 
@@ -36,7 +45,8 @@ A full-stack web application that processes videos using Google's Gemini AI mode
 - **Single Chunk Limit**: Individual chunks must be under 55 minutes (handled automatically)
 - **File Size**: Application supports uploads up to 5GB per file
 - **Supported Formats**: MP4, AVI, MOV, WMV, MKV, WEBM
-- **Parallel Processing**: Max 2 videos simultaneously (rate limit protection)
+- **Parallel Processing**: Max 2 videos simultaneously in single mode (rate limit protection)
+- **Batch Size**: Maximum 10 videos per batch processing session
 - **API Rate Limits**: Gemini free tier: 5 RPM (built-in 2s delay between calls)
 
 ## Project Structure
@@ -257,9 +267,13 @@ video_query/
 ## API Reference
 
 ### Video Processing Endpoints
-- **POST /api/process**: Main video processing endpoint
+- **POST /api/process**: Single video processing endpoint
   - Accepts JSON: `file_path`, `filename`, `prompt` (for chunked uploads)
   - Returns: Processing result with content, processing time, chunks info
+- **POST /api/process-batch**: Batch video processing endpoint
+  - Accepts JSON: `videos` (array of {file_path, filename, order}), `prompt`, `batch_id`
+  - Returns: Unified result for all videos, total chunks processed
+  - Maximum 10 videos per batch
 
 ### Chunked Upload Endpoints
 - **POST /api/init-upload**: Initialize chunked upload session
@@ -304,14 +318,40 @@ video_query/
 3. Open: http://localhost:3000
 
 ### Processing Videos
-1. **Upload**: Drag & drop multiple videos or click to select
-2. **Queue**: Videos appear in "Processing Queue" section
-3. **Select Prompt**: Choose processing mode or write custom prompt
-4. **Process**: Click "Process N Videos" button
-5. **Monitor**: Watch real-time progress (2 videos process in parallel)
-6. **Manage**: Use Stop (⏸️), Retry (🔄), or Remove (🗑️) buttons
-7. **View Results**: Check "Processed Videos" section for completed results
-8. **Download**: Click "Download PDF" or "Copy Formatted" for any completed video
+
+The application supports two processing modes, selected via a toggle at the top:
+
+#### Single Video Mode (Default)
+Process videos individually with per-video control:
+1. **Select Mode**: Click "Single Video Mode" button at the top
+2. **Upload**: Drag & drop videos or click to select files
+3. **Choose Prompt**: Select a prompt template or write custom prompt
+4. **Process Each Video**: Click individual "Process Video" button for each uploaded video
+   - Videos show status: uploading → uploaded → processing → completed
+   - Up to 2 videos process in parallel automatically
+5. **Monitor Progress**: Watch real-time status updates and processing indicators
+6. **Manage Queue**: Use Stop (⏸️), Retry (🔄), or Remove (🗑️) per video
+7. **View Results**: Completed videos appear in "Processed Videos" section
+8. **Download**: Click "Download PDF" or "Copy Formatted" for any result
+
+#### Batch Mode
+Process multiple related videos as one unified analysis:
+1. **Select Mode**: Click "Batch Mode" button at the top
+2. **Upload Videos**: Add multiple related videos (max 10 per batch)
+3. **Arrange Videos**: Use Up/Down arrows to reorder videos in logical sequence
+4. **Remove Unwanted**: Click Remove button to exclude videos from batch
+5. **Choose Prompt**: Select or customize the analysis prompt
+6. **Process Batch**: Click single "Process Batch" button to analyze all videos together
+   - Backend automatically handles video splitting and chunking
+   - Two-stage synthesis creates unified result across all videos
+   - Multiple Mermaid diagrams merged into one comprehensive diagram
+7. **View Results**: Single unified result appears for entire batch
+8. **Download**: Generate PDF with combined analysis
+
+**Key Differences**:
+- **Single Mode**: Each video = separate result, manual per-video processing
+- **Batch Mode**: All videos = one unified result, single batch processing
+- **Explicit Control**: No auto-processing - all require button clicks
 
 ### Processing Long Videos
 - Videos > 54 minutes automatically split into chunks