During March 2025, Pengler contributed to the FFmpeg/asm-lessons repository by enabling in-place mutation of input data within the SIMD-assembly processing path. This work involved removing const qualifiers from assembly function parameters, allowing direct modification of input buffers and facilitating more flexible data handling. By leveraging assembly programming and low-level optimization techniques, Pengler’s changes laid the groundwork for future SIMD-based performance improvements. The implementation was carefully documented and maintained clear commit traceability, reflecting a methodical approach to codebase evolution. Although the contribution was focused on a single feature, it demonstrated depth in performance optimization and assembly language expertise.