Justin R. developed targeted optimizations for the DHAV demuxer in the ossrs/ffmpeg-webrtc repository, focusing on improving duration retrieval and seeking reliability for streaming media. By implementing a backward scanning approach that buffers the last 1 MiB of data and performs byte-by-byte end-tag checks, Justin reduced unnecessary seeks on truncated files and minimized HTTP requests for network streams. This work, using C and leveraging skills in file I/O and multimedia frameworks, enhanced both startup latency and playback reliability. The solution addressed real-world streaming challenges, demonstrating a thoughtful application of low-level programming and performance optimization within a complex codebase.