无压缩4K超高清EFP系统中PTP精确时钟同步技术解析

Analysis of Precision Clock Synchronization Technology in Uncompressed 4K UHD EFP System

在SMPTE-2110无压缩标准指导下,新的4K-EFP超高清制作系统业务数据全IP化以及4K视频流无压缩处理已是必选方向。这种广电三层结构的IP制作网在IP网络层的互通只是第一步,由于网络环境存在未知性,为了真正确保数据流业务同步、有序、准确的运行使节目生产正常化,PTP网络精确时钟就是非常重要的事情,没有它整个超高清制作系统就会瘫痪无法进行节目制作。本文将依托新搭建的4K-EFP从标准、系统、授文解读、错误判断等方面着重解析PTP网络精确时钟同步涉及的应用技术理念。

Under the guidance of SMPTE-2110 uncompressed standard,all-IP-based transmission of business data in new 4K-EFP UHD production system and uncompressed processing of 4K video stream have become required direction.The interconnection of this three-layer structured IP production network at IP network layer is only the first step.Because of unknown network environment,PTP precision clock is very important in order to truly ensure synchronous,orderly and accurate operation of data stream services and normalize program production.Without it,the entire UHD production system would be paralyzed and unable to produce programs.Based on the newly built 4K-EFP,this paper will focus on analyzing application technology concepts of PTP precise clock synchronization from the aspects of standard,system,profiles solution and error judgment.