# Yinqing Zhao

> Engineer on video codec/streaming/transcoding

Location: Mountain View, California, United States
Profile: https://flows.cv/yinqing

Over 20 years experiences on video related technologies such as codec, streaming, transcoding, back end server framework

## Work Experience
### Principal Engineer @ CooTek
Jan 2018 – Present | Mountain View, CA
(1) Interactive video game encoding and streaming
- Developed the interactive game encoding and streaming on Raspberry Pi 3
- Designed and implemented special GoP structure to reduce streaming latency
- Developed the mobile client end decoder to decode the encoded game stream
- Developed the bandwidth estimation algorithm at the distribution server to adjust frame rate based on the estimated bandwidth
(2) Developed backend message pushing and email distribution service for short video social App

### Principal Engineer @ Verizon
Jan 2015 – Jan 2018 | San Jose, CA
(1) Worked on backend transcoding framework for Verizon IPTV product
- Developed the backend server architecture for fast and reliable transcoding both live and Video-on-Demand (VoD) contents
- Developed the backend video pipeline for both live and VoD contents
- Developed the Raft consensus algorithm to improve the backend server stability
(2) Developed a monitoring system for IPTV backend that can show real time system health and act proactively to reduce the interruption to live channel transcoding

### Senior Staff Engineer @ Real Communications Inc.
Jan 2013 – Jan 2015 | San Jose, CA
(1) Worked on the firmware development for HEVC hardware decoder in hardware video decoding engine (MIPS core)
(2) Developed HEVC decoder verification C model for the HEVC hardware decoder in multi-format video engine
(3) Developed the VP9 VLD decoder C-model that verifies the hardware design
(4) Involved in China’s next generation audio and video coding standard (AVS2 P2)
- Proposed the 10-bit profile for AVS P2
- Submitted proposals to modify inverse transform and direct mode motion vector derivation to make it friendly for hardware implementation

### Technical Lead @ Cisco Systems
Jan 2012 – Jan 2013 | San Jose, CA
(1) Worked on the Cisco Prevision Video Engine (CPVE) which powers Cisco Jabber enterprise communication (audio/video/message) product family.
- Optimized the H.264 encoder/decoder performance on mobile platform using ARM NEON intrinsic functions and ARM assembly instructions
- Developed the H.264 encoder/decoder GStreamer element using Android MediaCodec API
- Developed the error resilience techniques for reliable video transmission cross IP network (H.264 picture buffer management with long term reference frame, error resilience protocol (FLUX))
- Developed the captured video parameter selection algorithm for grabber bin GStreamer elements in the CPVE pipeline

### Senior Software Engineer @ Intel Corporation
Jan 2009 – Jan 2012 | Santa Clara, CA
(1) Worked in a group to develop the first H.264 AVC encoder on Intel graphics chip
- Developed the frame level constant bit rate (CBR) and variable bit rate (VBR) rate control algorithm
- Developed the first H.264 AVC encoder kernel on Intel graphics chip
- Developed hierarchical motion search and multi-reference encoding tools to improve the H.264 AVC encoder quality
(2) Developed the video conference software prototype based on H.264 encoder enabled by Intel graphic chip
- Developed the camera model for video capture from 2D USB camera, stereoscopic camera, and depth camera
- Developed features to enhance user experience using stereoscopic camera and depth camera: background removal, 2.5D parallax viewing experience, face composition, 3D video conference with 3D re-composition on remote end

### Research Engineer @ Motorola, Inc
Jan 2005 – Jan 2009 | San Diego, CA
(1) Motorola H.264 AVC encoder
- Developed the technique for advanced coding structure (B_store)
- Developed advanced buffer management tools for memory management control operation (MMCO) and reference picture list reordering (RPLR) at the encoder side
(2) Motorola real time H.264 AVC encoder
- Developed an efficient unrestricted motion search (UMS) algorithm
- Motion estimation complexity control algorithm for multiple references and multiple partitions
(3) Motorola real time picture-in-picture (PIP) encoder
- Research and develop the new fast motion search algorithm for multiple reference frames and multiple macroblock partitions
(4) Motorola real time H.264 AVC transcoder
- Developed the real time H.264 transcoder system
- Developed the rate control algorithm for multiple transcoded video streams and data
(5) Design/Implement the architecture for Motorola multi-pass H.264 AVC encoder
- Research and implementation on rate control algorithm based on adaptive model
- Design and implementation of the architecture of the multi-pass H.264 AVC encoder


## Education
### PhD in Electrical Engineering
University of Southern California

### Master of Engineering in Automatic Control
Tsinghua University


## Contact & Social
- LinkedIn: https://linkedin.com/in/yinqing-zhao-3151271

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Source: https://flows.cv/yinqing
JSON Resume: https://flows.cv/yinqing/resume.json
Last updated: 2026-04-12