Worked on enhancing video decoder error handling in the intel/vpl-gpu-rt repository, focusing on improving diagnostic clarity and stability across AV1, VVC, and legacy decoders. Used C++ to reclassify the empty-surface error, shifting it from a memory lock issue to an invalid video parameter, which streamlined support for invalid parameter conditions. Introduced a new error code to better represent device-level failures, ensuring more accurate feedback during device errors. Applied these error handling improvements consistently across multiple decoder paths, resulting in clearer diagnostics and more maintainable code. The work emphasized robust error handling and video decoding expertise throughout the codebase.