基于DVB和IP双结构传输模式的复合流式虚拟视频点播系统设计  

Design of composite streaming virtual VOD system based on DVB and IP dual structure transmission mode

作　　者：李玉华[1] 邱心莹 邹璇[1] LI Yuhua;QIU Xinying;ZOU Xuan(College of Science and Technology,Nanchang University,Jiujiang 332020,China;Hefei University of Technology,Xuancheng 242000,China)

机构地区：[1]南昌大学科学技术学院,江西九江332020 [2]合肥工业大学,安徽宣城242000

出　　处：《现代电子技术》2025年第4期63-67,共5页Modern Electronics Technique

基　　金：江西省教育教学改革研究课题:应用型高校专门用途英语(ESP)虚拟教研室建设探究与实践(JXJG-23-30-3)。

摘　　要：当虚拟视频点播系统遇到高访问量时会使其服务器负荷过大,导致视频传输速度下降、播放不连续。因此,设计一种基于DVB和IP双结构传输模式的复合流式虚拟视频点播系统,以适应用户需求和网络条件,动态调整视频流的传输质量和分辨率。构建基于DVB和IP双结构传输模式的复合流式虚拟视频点播系统框架,终端用户通过基础服务层的Web页面提交视频点播申请后,从视频编排层获取点播视频;控制层的播出控制模块调取PBHS算法来实现网络资源受限下的带宽自适应分配,以动态地调整不同带宽占用,优化网络资源利用,提高传输效率。通过视频传送模块输出点播视频,利用传输层的IP和DVB双结构传输模式将其输送到应用层,最终可视化呈现给用户。实验结果表明,所设计系统可实现虚拟视频点播,视频播放连续不卡顿、画面分辨率高,信令延迟仅34 ms,视频传输速度达到18 Mb/s,平均点播时间为1 320 ms,且拒绝用户数少。When the virtual video-on-demand(VOD)system has high traffic,its server will be overloaded,resulting in a decrease in video transmission speed and discontinuous playback.Therefore,a composite streaming virtual VOD system based on DVB and IP dual structure transmission mode is designed to adapt to user needs and network conditions,and dynamically adjust the transmission quality and resolution of video streams.The composite streaming virtual VOD system framework based on DVB and IP dual structure transmission mode is built.After the end user submits VOD requests on the Web page of the basic service layer,they obtain the on-demand video from the video orchestration layer.The broadcast control module of the control layer can be used to call the PBHS algorithm to realize the adaptive bandwidth allocation under network resource constraints,dynamically adjusting different bandwidth occupancy,optimizing network resource utilization,and improving transmission efficiency.The on-demand video can be outputted by means of the video transmission module,the IP and DVB dual structure transmission mode of the transport layer is used to deliver them to the application layer,so as to visualize and present them to users.The experimental results show that the designed system can realize virtual VOD,with continuous video playback without lagging,high image resolution,signaling delay of 34 ms,video transmission speed of 18 Mb/s,average on-demand speed of 1320 ms,and low number of rejected users.

关 键 词：DVB IP传输 视频点播 复合流 WEB页面 PBHS算法 播出控制 

分 类 号：TN934.3-34[电子电信—信号与信息处理] TP393[电子电信—信息与通信工程]