Auto-editor is a command-line application for automatically editing video and audio content. It analyzes media files to detect silent or still sections (based on audio loudness, motion, black frames, or subtitles) and automatically cuts them out, producing a more concise output. The tool supports a wide range of input and output formats, leveraging FFmpeg for media processing and offering export options tailored to popular video editing software like Adobe Premiere Pro, Final Cut Pro, DaVinci Resolve, Shotcut, and Kdenlive. The architecture is modular, with distinct modules for analysis (audio, motion, black detection, subtitle processing), rendering, export format handling, and command-line interface. Key features include a plugin-like system for edit methods (e.g., audio-based, motion-based), a caching mechanism to avoid redundant analysis, support for keyboard input via microphone, and integration with Whisper.cpp for speech transcription. The project also provides a web interface and supports advanced features like transitions, speed ramping, volume ducking, and keyframe-based effects. The codebase demonstrates strong engineering practices through its use of a custom expression language for defining edit decisions, SIMD-optimized performance critical paths, and a clear separation between media processing logic and user-facing functionality. Despite its complexity and reliance on external multimedia libraries, the project maintains active development with regular updates and cross-platform support.