Worked on improving Dolby Vision mode handling in the rdkcentral/entservices-inputoutput and rdkcentral/rdkservices repositories, focusing on API correctness and reliability. Addressed two core bugs by implementing strict validation in C++ to ensure that getDolbyVisionMode only returns Dolby Vision mode information for actual DV content, returning clear errors for non-DV content. This approach eliminated incorrect data exposure and reduced downstream UI and UX confusion. Emphasized robust error handling and debugging practices, enhancing cross-repo consistency and traceability. The work strengthened the reliability of DV-related features in embedded systems without introducing new user-facing features, prioritizing accurate data reporting and maintainability.