Ben Cheng contributed to the ossrs/ffmpeg-webrtc and FFmpeg/FFmpeg repositories by enhancing hardware-accelerated video encoding and decoding workflows. He stabilized the AV1 hardware encoding path by aligning reference list management with strict driver requirements, improving compatibility and reducing runtime failures. In FFmpeg/FFmpeg, Ben optimized the Vulkan encoding pipeline, simplified resource usage, and implemented DPB-aware ID management for VP9 and AV1, which improved frame threading and decoding stability. He also addressed CBS data handling bugs and strengthened Vulkan Validation Layers test reliability. His work demonstrated depth in C and C++ development, low-level programming, and codec implementation, resulting in robust, maintainable solutions.