Thomas Li focused on architecture improvements and quality fixes in video encoding during September 2025, working primarily in the intel/media-driver and intel/vpl-gpu-rt repositories. He modularized codec components by relocating the AQM interface to the codec hardware base and refactored AVC encoding logic to streamline interfaces and reduce code duplication, enhancing maintainability and encoding efficiency. In addition, Thomas addressed a critical bug in AV1 encoding by refining the SetFH transform-set capability handling, ensuring correct logic based on hardware support. His work, leveraging C++ and deep knowledge of video encoding and codec development, improved code quality and platform encoding performance.