摘要
针对目前地铁视频播放系统普遍存在的视频处理终端死机、图像清晰度低、播放不流畅等问题,设计了一种以全志A20芯片为核心处理器、搭载Linux操作系统、以UDP为网络传输协议、支持720 P和1 080 P视频分辨率的高清视频播放系统,并针对地铁车载环境,改进了UDP并优化了H.264视频编码算法.实验结果表明:算法优化后的编码时间平均缩短了50%,解码后视频与原视频的相似度高达0.979 3;在较差的网络环境下,采用改进的UDP,数据丢包率平均下降了62.33%.在系统运行过程中,客户端显示画面清晰、流畅,满足了地铁车载环境下的高清视频播放要求,具有广阔的应用前景.
Video player systems used in subway usually have the problems such as crash of video processing terminal,low image resolution and intermittent video play.Here,a high-definition video player system was designed based on an A20 chip equipped with Linux operating system.The video player system uses UDP as the network transmission protocol and supports 720 P and 1 080 P video resolution.The UDP has been improved and the H.264 video coding algorithm has been optimized according to the subway environment.As a result,the coding time of the optimized algorithm is reduced by an average of 50%,the decoded video has a similarity to the original video as high as 0.979 3.Besides,using our improved UDP,the data packet loss rate drops by an average of 62.33%in the poor network environment,leading to a clear and smooth video play in the terminal.These results demonstrate that the system meets the requirements of high-definition video play in the subway environment,and thus has broad application prospects.
作者
白华
赵旭峰
BAI Hua;ZHAO Xu-feng(School of Electronics and Information Engineering,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2018年第4期59-64,共6页
Journal of Tiangong University
基金
国家自然科学基金资助项目(61201106)
关键词
地铁车载
高清视频
播放系统
H.264编码
丢包率
用户数据报协议
subway environment
high-definition video
video player system
H.264 video encoding
data packet loss rate
user datagram protocol(UDP)