4K IP基带视频码流中的PTP同步信号解析研究  

Analysis and Research of PTP Synchronization Signal in 4K IP Baseband Video Stream

作　　者：卢玥 杨盈昀[1] Lu Yue;Yang Yingyun(Communication University of China,Beijing 100024,China)

机构地区：[1]中国传媒大学,北京100024

出　　处：《广播与电视技术》2021年第10期42-47,共6页Radio & TV Broadcast Engineering

摘　　要：IP化架构颠覆了传统SDI架构,将基带信号封装成IP码流在以太网上传输,简化了系统结构,并提高了带宽利用率,但IP化架构在带来便捷的同时也带来了新的同步关系。为达到广电行业高精度低延时的要求,4K IP码流中采用了PTP(精确时钟协议)进行各时钟间的准确同步,这种方式与传统的电视同步系统有很大的区别。本文对4KIP基带视频码流中的PTP同步信号及RTP数据报进行解析,以方便广电从业者对基于4K IP的电视节目制播系统的理解和应用。IP-based architecture subverts traditional SDI architecture. It encapsulates baseband signals into IP streams and transmits them on the Ethernet, greatly simplifying system structure and improving bandwidth utilization. However, while bringing convenience, it also involves new synchronization relationships. In order to meet the requirements of high-precision and low-latency in radio and television industry, PTP(Precision Clock Protocol) is used for accuracy synchronization between clocks in 4K IP stream, which is very different from traditional TV synchronization system. Therefore, this paper analyzes PTP synchronization signals and RTP packets in 4K IP baseband video stream to facilitate radio and television practitioners to understand and apply 4K IP-based TV program production and broadcasting system.

关 键 词：4K IP 基带视频 RTP PTP 

分 类 号：TN919.1[电子电信—通信与信息系统]