During December 2024, this developer enhanced open-source multimedia tools by implementing two feature-driven improvements focused on encoding efficiency and user experience. In the ossrs/ffmpeg-webrtc repository, they added VideoToolbox spatial adaptive quantization (spatial_aq) support, enabling macOS 15 compatibility and improved video encoding through C and FFmpeg. For obsproject/obs-studio, they refactored the MP4 output plugin to use a packet time callback, ensuring chapter markers align precisely with video frames rather than relying on DTS-based timing. Their work emphasized reliability and accuracy in chaptered recordings, leveraging expertise in multimedia frameworks, OBS plugin development, and macOS development to deliver tangible user benefits.