Derek Buitenhuis contributed to the ossrs/ffmpeg-webrtc and FFmpeg/FFmpeg repositories, focusing on audio processing and demuxer reliability. He addressed a memory leak in the dhav demuxer by refining memory management in C, ensuring resources were properly released during error handling and duration calculations. Derek also improved maintainability by removing obsolete Libav merge scripts and documentation. In FFmpeg/FFmpeg, he resolved a regression in the mov demuxer’s PCM tts handling, enhancing playback stability for legacy PCM files. His work demonstrated a strong grasp of C programming, FFmpeg internals, and code cleanup, resulting in more robust and maintainable audio processing pipelines.