Worked on the FFmpeg/FFmpeg repository to address a bug affecting HLS segment duration calculations when audio and video streams used different time bases. The solution involved normalizing start presentation timestamps and packet timestamps to a common time base, ensuring accurate segment boundaries during HLS muxing. This fix stabilized segment splitting in scenarios involving video passthrough and audio transcoding, reducing segmentation errors in both live and VOD streaming workflows. The work demonstrated careful application of C programming, streaming protocol knowledge, and video processing expertise, with clear, well-documented code changes that minimized risk and improved the reliability of streaming output in production environments.