基于众核平台的多路超高清视频编码系统设计  

Multi-channel UHD video encoding system based on many-core platform

作　　者：姚佳[1] 高志勇[1] 张小云[1] 

机构地区：[1]上海交通大学图像通信与网络工程研究所,上海200240

出　　处：《电视技术》2016年第4期7-11,共5页Video Engineering

基　　金：国家自然科学基金项目(61301116)

摘　　要：首次展示一套基于低功耗众核TILE-36处理器平台的多路超高清实时系统。该系统可以同时编码4路HEVC超高清视频,并经过TS复用后以常码率的形式发送到解码端。为了保证编码系统稳定运行,采取了基于非线性R-Q模型的闭环码率控制来调整编码器的输出码率,同时引入缓存控制机制来确保系统总延时恒定,最后加入了基于帧数统计的时钟同步机制来同步系统中各模块的时钟。实验显示该系统能够长时间稳定运行,并具有同时编码4路HEVC超高清视频的能力。In this paper, a multi-channel ultra-high definition （UHD） encoding real-time system is presented for the first time, which is based on the many-core TILE-Gx36 processors platform with low-power consumption. This system can simultaneously en- code four UHD video inputs in HEVC, and transmit the encoded streams to the decoder after the MPEG transport stream （TS） multiplexing in constant bitrate （CBR）. To ensure the system running stable, a closed-loop rate-control mechanism based on non- linear R-Q model to adjust the output bitrate of encoder is proposed, and a buffer-control mechanism is used to make the system latency constant, in the end a clock synchronization mechanism based on the statistics of frame number is proposed to synchronize the clocks in the real-time system. Experiments show that the proposed system can keep stable running for a long time, and has the capacity of encoding 4-channel UHD video simultaneously.

关 键 词：多路超高清 众核 码率控制 实时系统 

分 类 号：TN949.292[电子电信—信号与信息处理]