|Professor Klara Nahrstedt: Principle Investigator |
Bo Chen: Ph.D. Student
Zhisheng Yan: Assistant Professor (George Mason University)
Yinjie Zhang: Ph.D. Student
Zhe Yang: Ph.D. Student
- Fall 2021-Present
Video codecs play an important role in live video streaming, accounting for a significant portion of today’s Internet traffic. Typically, live streaming systems are built with traditional codecs like AVC, HEVC, and MPEG, which have achieved great success during the past decades. In recent years, learned video codecs have been getting more attention by outperforming traditional video codecs in terms of coding efficiency. Nevertheless, the encoding speed of existing learned video codecs is far from supporting live streaming due to the slow forward propagation problem.
We propose LSVC, a parallelized learned video codec with an encoding speed that supports live streaming and state-of-the-art coding efficiency, to address this issue. LSVC accelerates encoding with a novel tree-based compression scheme, allowing parallelization in compression and trading GPU utilization for encoding speed. LSVC further improves its coding efficiency with a space-time-aware entropy module that fully exploits spatiotemporal features during video compression. LSVC outperforms H.265 by saving 8% bandwidth consumption in live streaming while improving the video quality by 0.4 dB in Peak-Signal-to-Noise-Ratio. LSVC achieves an encoding speed of 30 fps, outperforming DVC and RLVC, state-of-the-art learned video codecs, by 20% and 40%.
This project is supported by the Army Research Lab funding.