Xianfeng Zhang
Software Development Engineer at Microsoft
Bellevue, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolXianfeng Zhang is a software development engineer with nine years of professional experience and a deep focus on video processing and encoding stacks. Based in Bellevue, WA, he has contributed significant backend work to Intel’s open-source projects (intel/libva and intel/media-driver), implementing features like total color correction, new color standards, HEVC/AVC/VP8 encode improvements, and memory-leak fixes that touch core API headers and bitstream generation. At Microsoft since 2008, he brings production-grade systems experience built on earlier engineering roles at Intel, Lenovo, and Morgan Stanley. He combines low-level multimedia expertise with pragmatic engineering practices, often working on performance-sensitive, platform-adjacent code rather than user-facing features. A detail that sets him apart is his hands-on experience modifying core driver and API structures, indicating comfort operating at the hardware–software boundary.
8 years of coding experience
5 years of employment as a software developer
Xi'an Jiaotong UniversityNational University of Singapore
Github Skills (21)
c-language10
video-encoding10
youtube-api10
vimeo-api10
c1110
graphic10
c1710
api10
driver10
hevc10
videojs10
encode10
vaapi10
cprogramming-language10
h2649
Programming languages (2)
Github contributions (5)
intel/libva
Jun 2017 - Dec 2022
Libva is an implementation for VA-API (Video Acceleration API)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:23 releases, 340 reviews, 124 commits in 5 years 7 months
Contributions summary:Xianfeng primarily contributed to the Video Acceleration API (VA-API) implementation for the `intel/libva` repository. Their work focused on enhancing and optimizing the API, including the addition of new features like total color correction and new color standards, along with encoding improvements. They also added support for new buffer types, and extended existing functionalities, such as the addition of sequence display extension support for MPEG2 encode. The user's contributions included changes to the core API headers and structures, indicating a focus on the underlying video processing and encoding capabilities.
apiaccelerationvideo-decodingvideo-processingvideo-api
intel/media-driver
Dec 2017 - Oct 2022
Intel Graphics Media Driver to support hardware decode, encode and video processing.
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 releases, 165 reviews, 140 commits in 4 years 10 months
Contributions summary:Xianfeng primarily contributed to the Intel Graphics Media Driver, focusing on features related to video encoding, particularly HEVC, AVC, and MPEG2. They implemented and modified core components for HEVC, and VP8 encode, which includes changes to picture parameters, slice parameters, and packed headers for bitstream generation. Further contribution was done to add unregister surface method and correct several memory leak issues.
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