## Overview
Refactored compression system to replace original files in-place instead of creating duplicate files with _compressed suffix. This eliminates disk space waste when compressing videos.
## Key Changes
### Backend (backend/compression.py)
- **Added enhanced validation** (`validate_video_enhanced`):
- FFmpeg decode validation (catches corrupted files)
- File size sanity check (minimum 1KB)
- Duration comparison between original and compressed (±1 second tolerance)
- **Implemented safe file replacement** (`safe_replace_file`):
- Enhanced validation before any file operations
- Atomic file operations using `os.replace()` to prevent race conditions
- Backup strategy: original → .backup during replacement
- Automatic rollback if validation or replacement fails
- Comprehensive logging at each step
- **Updated compress_video function**:
- Removed `_compressed_75` suffix from output filenames
- Changed to use original file path for in-place replacement
- Calls new safe_replace_file method instead of simple os.rename
- Improved logging messages to reflect replacement operation
### Frontend (frontend/src/App.jsx)
- Updated compression success messages to show reduction percentage
- Messages now indicate file is being replaced, not duplicated
- Displays compression reduction percentage (e.g., "Started compressing file.mp4 (75% reduction)")
## Safety Features
1. **Backup-and-restore**: Original file backed up as .backup until verification passes
2. **Enhanced validation**: Three-level validation before committing to replacement
3. **Atomic operations**: Uses os.replace() for atomic file replacements
4. **Automatic rollback**: If any step fails, original is restored from backup
5. **Comprehensive logging**: All file operations logged for debugging
## File Operations Flow
1. Compress to temp file
2. Enhanced validation (decode + size + duration)
3. Create backup: original.mp4 → original.mp4.backup
4. Move compressed: temp → original.mp4
5. Verify final file is accessible
6. Delete backup only after final verification
7. Rollback if any step fails
## Testing
- Docker rebuild: `docker compose down && docker compose build && docker compose up -d`
- Manual testing recommended for compression jobs with various video files
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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