高压缩率低时延4K视频流异构传输方案研究  

Research on heterogeneous transmission scheme of 4K video stream with high compression rate and low latency

作　　者：钟怀 谢子成 唐立军[1] ZHONG Huai;XIE Zicheng;TANG Lijun(School of Physics&Electronic Science,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410114

出　　处：《电子设计工程》2024年第18期114-118,共5页Electronic Design Engineering

基　　金：湖南省水利科技项目(XSKJ2019081-44)。

摘　　要：H.265视频编解码通常用于超高清视频,但由于数据量大,编解码算法复杂,会导致较大的视频端到端传输时延。该文提出了一种针对4K视频流H.265编解码的低时延解决方案,采用同步机制的异构多核ARM+FPGA架构,在RAM端搭建Linux操作系统实现多任务处理和实时监控,在FPGA端实现并行加速的H.265编码格式。利用该方案对4K@60 Hz,像素格式YCbCr 4∶2∶0,颜色深度8 bits的视频进行测试。测试结果显示,端到端时延仅为29.5 ms,其中捕获时间为2 ms,编码时间为5 ms,解码时间为10 ms,显示时间为12.5 ms,传输速度提高了45.5%。通过比较分析,该方法在保证高压缩率的情况下,具有低时延传输的明显优势。H.265 video codec is usually used for ultra HD videos.However,due to the large amount of data and complex codec algorithm,the end-to-end video transmission delay is relatively large.In this paper,a low latency solution for 4K video stream H.265 codec is proposed.A heterogeneous multi-core ARM+FPGA architecture based on synchronous mechanism is adopted.Linux operating system is built on the RAM side to realize multitasking and real-time monitoring,and parallel accelerated H.265 encoding format is implemented on the FPGA side.This scheme is used to test the video with 4K@60 Hz,pixel format YCbCr 4∶2∶0 and color depth of 8 bits.Test results show that the end-to-end delay is only 29.5 ms,including capture time of 2 ms,encoding time of 5 ms,decoding time of 10 ms,display time of 12.5 ms,transmission speed increased by 45.5%.Through comparative analysis,this method has the obvious advantage of low latency transmission under the condition of guaranteeing high compression rate.

关 键 词：同步机制 低时延 H.265 4K视频流 异构多核 

分 类 号：TN919.81[电子电信—通信与信息系统]