MotionEye is a production-grade, self-hosted web frontend for the Linux motion daemon, providing a comprehensive management interface for IP and USB cameras. The system is implemented as a Python Tornado web server with a RESTful JSON API and a feature-rich single-page JavaScript UI. In production, it manages local and remote cameras, handles real-time MJPEG streaming, motion-triggered recording, scheduled timelapse generation, cloud uploads (S3, WebDAV, FTP, etc.), and notifications via email, Telegram, and webhooks. Configuration is stored in flat text files parsed and written by the motion daemon, with the web server acting as a configuration bridge. The architecture is a monolith: a single Tornado process serves all HTTP requests, manages subprocesses for media processing (ffmpeg), and controls the motion daemon lifecycle. Key entry points include the `meyectl` CLI (for daemon control and maintenance tasks) and the web UI served on port 8765. External dependencies include the motion daemon, ffmpeg/ffprobe, and system utilities for power management, SMB mounts, and WiFi control. While the codebase is large and has accumulated some technical debt (monolithic JavaScript file, hardcoded secrets, SHA1 usage), it demonstrates solid engineering with clear module separation, extensive test coverage for critical handlers, and a well-designed HMAC authentication scheme for server-to-server communication.