Over a two-month period, this developer enhanced YUV to RGB conversion in the FFmpeg and ossrs/ffmpeg-webrtc repositories, focusing on performance and cross-platform compatibility. Leveraging C, assembly, and NEON intrinsics, they introduced NEON-accelerated conversion paths, unified and refactored low-level code, and implemented two-line batch processing for improved throughput on ARM64 hardware. Their work included chroma-preserving optimizations, explicit endianness handling for 16bpp formats, and alpha-aware processing for YuVA420P, all validated with extensive testing and benchmarks. These contributions improved color fidelity, format compatibility, and maintainability in multimedia pipelines, supporting higher-quality video processing with minimal performance trade-offs.