Guannan Z.

I have over 15 years of software development experience, specializing in audio and video processing and media streaming development. 🎯 Services I Offer • FFmpeg & GStreamer Development & Integration • Video Editing & Post Effects (Overlays, Watermarks, Transitions) • Cross-Platform Media Player Development (Windows, macOS, iOS, Android) • Live / VOD & Adaptive Streaming (HLS, DASH, ABR) • WebRTC Development (Real-time Communication) • Video Processing Performance Optimization & Hardware Acceleration • Audio/Video Codec Development & Optimization • Troubleshooting (C/C++) • Cross-Platform Client App Development (Qt / VC++ / Windows / macOS / Mobile) • Full-Stack Media System Development 💻 My technical stack includes: ✔ Open-Source Projects: FFmpeg, GStreamer, OBS Studio, ExoPlayer, IJKPlayer, WebRTC, SRS ✔ Programming Languages and Frameworks: C/C++ (11, 14, 17, 20) , Python, NodeJS, Objective-C, Java, JavaScript, Qt 4.x – 6.x, WinAPI, MFC ✔ Streaming Protocols: HLS, FLV, DASH, RTMP, RTP ✔ Codecs and Container Formats: H.264, H.265, AAC, MP3, AV1, MP4, MKV, MPEG-TS ✔ Hardware Acceleration and Rendering Technologies: MediaCodec, VideoToolbox, Metal, OpenGL, OpenGL ES, Direct3D, Vulkan ✔ Networking Technologies: HTTP, TCP, UDP, QUIC, Cronet, CURL ✔ Operating Systems: Windows, macOS, iOS, Android ✔ IDEs: Visual Studio, Visual Studio Code, Xcode, Android Studio, Qt Creator ✔ Version Control Systems: Git, SVN, Mercurial I have worked at major technology companies such as Alibaba, gaining extensive project experience. I pay great attention to detail, am proactive in learning and problem-solving, and can quickly adapt to different project requirements. Feel free to contact me anytime!