Add comprehensive improvement proposals to enhancement_proposals.md

- Added Error Recovery and Resilience section for better error handling
- Added Memory and Performance Optimization for large file support
- Added Security Improvements for API key management
- Added Advanced User Experience features (dry-run, statistics, flexible options)
- Added Code Quality Improvements (type hints, dependency management)
- Added Extended Format Support (video files, audio features, offline mode)
- Added Output Management for better organization and export options
- Added Integration Capabilities (cloud storage, note-taking apps, automation)

enhancement_proposals.md

@@ -89,6 +89,127 @@ This document outlines proposed improvements for the mknotes software, grouped b
   - Provide sample configuration files for different use cases.
   - Include examples of custom prompts for different types of content.
 
+## Error Recovery and Resilience
+
+- **Robust Error Recovery**
+  - Implement proper error recovery mechanisms to prevent data loss
+  - Save transcriptions before enhancement to avoid losing work if API fails
+  - Add retry mechanism with exponential backoff for failed API calls
+  - Handle partial failures gracefully in batch processing
+
+- **Process Persistence**
+  - Add checkpoint/resume functionality for interrupted batch processing
+  - Save processing state to allow continuation from last successful file
+  - Implement transaction-like processing (all-or-nothing for each file)
+
+## Memory and Performance Optimization
+
+- **Large File Handling**
+  - Implement streaming support for large audio files
+  - Add chunked processing to avoid loading entire files into memory
+  - Optimize memory usage for batch processing
+
+- **Parallel Processing**
+  - Implement concurrent transcription of multiple files
+  - Add configurable worker threads/processes
+  - Optimize API calls with batching where possible
+
+## Security Improvements
+
+- **API Key Security**
+  - Validate API key before starting batch processing
+  - Implement secure storage for API keys (keyring integration)
+  - Remove unnecessary API key parameter passing
+  - Add support for multiple API keys with rotation
+
+## Advanced User Experience
+
+- **Preview and Planning**
+  - Add dry-run mode to preview what will be processed
+  - Show estimated costs before processing
+  - Implement interactive file selection mode
+
+- **Processing Statistics**
+  - Display comprehensive statistics after processing (tokens used, cost, time)
+  - Add detailed progress reporting with ETA
+  - Generate processing summary reports
+
+- **Flexible Processing Options**
+  - Add option to skip transcription and only enhance existing text files
+  - Support for processing specific file patterns or date ranges
+  - Implement file filtering based on duration or size
+
+## Code Quality Improvements
+
+- **Type Safety**
+  - Add type hints throughout the codebase
+  - Implement proper data validation
+  - Use dataclasses for configuration objects
+
+- **Dependency Management**
+  - Remove standard library modules from requirements.txt (argparse)
+  - Pin dependency versions for reproducibility
+  - Add optional dependencies for advanced features
+
+- **Configuration**
+  - Remove hardcoded values (e.g., "gpt-4.1" model name)
+  - Make all parameters configurable
+  - Support multiple configuration profiles
+
+## Extended Format Support
+
+- **Video File Support**
+  - Extract audio from video files (MP4, AVI, MOV, etc.)
+  - Preserve video metadata in output
+  - Option to generate subtitles
+
+- **Advanced Audio Features**
+  - Language detection and specification for transcription
+  - Speaker diarization support
+  - Audio preprocessing options (noise reduction, normalization)
+  - Support for merging multiple audio files before processing
+
+- **Offline Capabilities**
+  - Support for custom Whisper model paths
+  - Local LLM integration for enhancement
+  - Fully offline mode with local models
+
+## Output Management
+
+- **Organization Features**
+  - Organize output by date, source, or custom categories
+  - Preserve original file metadata
+  - Generate index/summary files for processed batches
+  - Support for incremental updates to existing notes
+
+- **Export Options**
+  - Export to multiple formats simultaneously
+  - Custom templates for different output formats
+  - Metadata embedding in output files
+
+## Integration Capabilities
+
+- **Cloud Storage**
+  - Direct integration with S3, Google Drive, Dropbox
+  - Automatic backup of processed files
+  - Cloud-based processing queue
+
+- **Note-Taking Apps**
+  - Direct export to Notion, Obsidian, Roam Research
+  - Sync with existing note structures
+  - Tag and categorization support
+
+- **Automation**
+  - Webhook notifications for processing completion
+  - Custom post-processing script support
+  - Integration with workflow automation tools (Zapier, IFTTT)
+  - Watch folder functionality for automatic processing
+
+- **API and SDK**
+  - RESTful API for remote processing
+  - Python SDK for programmatic access
+  - Batch job scheduling support
+
 ---
 
 These recommendations are intended to guide future development and prioritization for mknotes. Each suggestion can be implemented independently or as part of a broader roadmap.