Worked on improving the stability and correctness of video processing pipelines in the ossrs/ffmpeg-webrtc and FFmpeg/FFmpeg repositories, focusing on robust error handling and high-bit-depth filter accuracy. Addressed critical bugs in C, enhancing the Libavfilter drawing initialization by validating return values and preventing null pointer dereferences, which increased the reliability of media drawing operations. In FFmpeg, delivered a targeted fix for the unsharp filter, correcting scaling logic for 9/10/12/16-bit video formats by widening intermediate arithmetic and validating output consistency. Emphasized defensive programming, clear error reporting, and cross-format compatibility, contributing to safer, more maintainable low-level video processing code.