Muiz contributed a targeted stability fix to the FFmpeg/FFmpeg repository, focusing on the MOV demuxer’s handling of large timestamps in HEVC files. By updating the next_ts field from int to int64_t, Muiz addressed a potential integer overflow that could cause seeking errors and unreliable playback for high-timestamp media. This change required a solid understanding of C programming, demuxing logic, and error handling within multimedia frameworks. Although the work was limited to a single bug fix over one month, it demonstrated careful attention to detail and a methodical approach to improving reliability in a widely used open-source multimedia project.