PySceneDetect is a production-grade Python library and CLI tool for detecting scene changes (cuts, fades, dissolves) in video files. It provides multiple detection algorithms (ContentDetector, AdaptiveDetector, ThresholdDetector, HistogramDetector, HashDetector, and TransNetV2 ONNX) and supports several video backends (OpenCV, PyAV, MoviePy). The architecture is modular: a VideoStream abstraction for decoding, a SceneDetector interface for pluggable algorithms, a SceneManager for orchestration, and output writers for CSV, EDL, FCP XML, OTIO, HTML, images, and video splitting. The CLI (built with click) offers chained subcommands for detection, splitting, and export. The repository also includes a comprehensive benchmark suite for evaluating accuracy on public shot-boundary datasets (BBC, AutoShot, ClipShots) using TRECVID-SBD metrics, making it valuable for both practical video processing and research. The codebase is well-structured, has extensive test coverage, and is actively maintained with recent releases and CI workflows.