S-Player is a polished desktop media player built with FFmpeg, vanilla JavaScript, and Node.js utilities. It focuses on media playback with rich subtitle workflows, including automatic companion file matching, multi-language subtitle merging, transcript navigation, selectable subtitle text, configurable subtitle placement, font customization, and optional pause-after-subtitle behavior. The app also supports playlists, repeat modes, recent file sets, external audio synchronization, playback position persistence, update checks, and macOS/Windows packaging through electron-builder. A modular architecture and Node’s built-in test runner cover subtitle parsing, media resolution, resume logic, repeat behavior, and transcript scrolling.