Worked on the FFmpeg/FFmpeg repository to enhance compatibility for MPEG-4 video files by updating the MOV/MP4 demuxer to recognize the .m4v extension. This targeted feature, implemented in C, broadened support for Apple-era MPEG-4 assets, reducing playback issues and streamlining video processing pipelines. The approach involved modifying the demuxer’s allowed extensions list, ensuring that files with the .m4v extension are properly ingested and processed. The work was delivered as a focused, well-documented commit, reflecting attention to maintainability and clarity. Skills applied included C programming and video processing, with an emphasis on compatibility improvements for widely used media formats.