Worked on refactoring the subtitle parsing engine in the jellyfin/jellyfin-vue repository, focusing on removing custom SSA parsing logic from the frontend worker and player element store. Integrated the ass.js library to handle subtitle parsing, which reduced redundant parsing operations and improved overall performance and reliability. This approach simplified the codebase, making it easier to maintain and test, while also reducing CPU overhead and latency during subtitle rendering. Utilized JavaScript, TypeScript, and Vue.js to implement these changes, aligning with the broader strategy of leveraging robust external libraries and laying the foundation for future enhancements in subtitle handling.