HandBrake is a cross-platform video transcoder application with GUIs for macOS (Cocoa/Objective-C), Windows (WPF/C#), and Linux (GTK/C). It features a shared core library (libhb) handling video/audio encoding, filtering, muxing, and job management. The application supports preset-based configuration, hardware acceleration (QSV, NVEnc, VCE, VideoToolbox), batch processing via job queues, and extensive format/subtitle handling. Architecture follows platform-appropriate patterns: MVVM in WPF, delegates/protocols in macOS, and GObject-based design in GTK. The codebase demonstrates strong modularity, clear separation of concerns, and active maintenance across all platforms.
PiPedal is a real-time audio effects processing system designed for guitarists, featuring a hybrid architecture with a C++ backend and React/TypeScript frontend. It hosts LV2/VST3 plugins to create customizable pedalboard chains, provides web-based remote control, manages Wi-Fi connectivity (including hotspot and P2P modes), handles MIDI input, and manages presets/snapshots of effect configurations. The system emphasizes low-latency audio processing for live performance and integrates with online services like Tone3000 for neural amp model downloads.