Worked on the videolan/vlc repository to enhance the stability of the demux subsystem by addressing a critical bug in the MKV demux path. Focused on defensive programming in C++ by implementing explicit validation checks to prevent null pointer dereference when accessing p_private_data, thereby reducing the risk of crashes and improving code safety. Applied strong error handling and software debugging skills to ensure that the demux module is more maintainable and reliable for end users. The work emphasized maintainable code practices and traceability, with clear commit documentation supporting future audits and performance reviews, contributing to overall VLC project robustness.