网络存储技术在网络化电视播出系统中的应用研究

发布时间：2018-10-12 13:29

【摘要】：伴随着电视节目制作向高清化转型,重复播出的大码率电视剧素材和宣传片占据了播出服务器宝贵的存储空间,因此,如何在节目媒资系统及视频服务器间建立成本相对较低并且易于管理的二级存储系统是目前网络化电视播出系统中急需要研究并解决的。在上一代标清电视播出系统中,我们使用光纤交换机为核心构建了播出网络。该系统运行中存在与以太网及其他异构系统兼容性较差的问题,造成播出平台内的存储系统无法和平台外的服务器实现数据共享,存储的节目素材无法被其他播控平台再利用。本文的研究目标是设计出一套能够克服上述缺点,并且符合网络化高清电视播控平台需求的网络存储系统。在网络化电视播出新系统的总体设计方面,主要采用了千兆以太网络和分级存储的方式。根据这一系统应用模式,本文通过分析,预估了新视觉高清二级存储系统的磁盘容量和网络带宽要求。考虑到播出平台将采用全硬盘的无带化播出方式,新系统中同时取消了灌录系统和自动控制网络。迁移系统在标清电视播出系统中承担了存储系统元数据以及节目内容采集的任务,存在任务多且业务流程不合理的问题。在新的网络化电视播控平台中,去除了灌录系统,添加了迁移策略服务器和编单工作站,对元数据和节目素材进行统一的管理。同时,对迁移系统的业务流程作了重新设计,添加了节目素材回迁功能,并优化了节目单接口服务器的工作流程。在存储硬件设备方面,一、采用磁盘柜取代了分散式的存储服务器,将所有磁盘集中至2个磁盘柜中,每个磁盘柜配置一块热备盘,同时配置两个存储控制器。二、采用大容量光纤磁盘取代了原先的SCSI磁盘。三、添加两台文件服务器和磁盘整列连接,采用集群文件系统管理,通过网络文件系统和视频服务器以及媒资系统实现数据共享。四、取消了光纤交换机,直接以存储控制器连接文件服务器和磁盘阵列,消除了总线或交换机方式造成的延迟。五、取消了元数据服务器,以文件服务器代替元数据服务器,元数据和节目数据共享数据通道,进一步精简了硬件结构。在新视觉高清二级存储系统的实现过程中,本文还设计了两个测试方案,对建成后二级存储系统进行了性能测试,以确保新系统符合设计要求。最后,我们实现了二级存储系统的数据共享以及节目素材自媒资系统经由二级存储系统至播出视频服务器的自动迁移,简化了二级存储系统架构,使播出系统更具开放性和灵活性。所设计的网络播出系统已应用于新视觉高清电视播出系统中,该系统自2012年12月投入使用以来运行稳定,播出质量得到了广大观众的一致认可。
[Abstract]:Along with the television program production to the high-definition transition, the repeat broadcast of the large code rate TV series material and propaganda occupied the broadcast server valuable storage space, therefore, How to establish a relatively low cost and easy to manage secondary storage system between program media system and video server is an urgent need to be studied and solved in the network television broadcast system. In the previous generation of SDTV broadcasting system, we constructed the broadcast network with optical fiber switch as the core. The system has poor compatibility with Ethernet and other heterogeneous systems, which results in the storage system in the broadcast platform can not share data with the server outside the platform, and the stored program material can not be reused by other broadcast control platforms. The research goal of this paper is to design a network storage system which can overcome the above shortcomings and meet the needs of networked HDTV broadcast control platform. In the overall design of the new network TV broadcasting system, gigabit Ethernet network and hierarchical storage are mainly used. According to the application mode of this system, this paper estimates the disk capacity and network bandwidth requirements of the new visual high-definition secondary storage system through analysis. Considering that the broadcast platform will adopt the full hard disk without tape broadcast mode, both the recording system and the automatic control network have been cancelled in the new system. The migration system undertakes the task of storing metadata and collecting program contents in the standard and clear TV broadcasting system. There are many tasks and unreasonable business processes. In the new networked TV broadcasting and control platform, the recording system is removed, the migration strategy server and single workstation are added, and the metadata and program material are managed uniformly. At the same time, the business process of the migration system is redesigned, the program material returning function is added, and the workflow of the program interface server is optimized. In the aspect of storage hardware, first, the disk cabinet is used to replace the distributed storage server, all the disks are centralized into two disk cabinets, each disk cabinet is equipped with a hot standby disk and two storage controllers are configured at the same time. Second, the SCSI disk was replaced by a large-capacity fiber-optic disk. Third, add two file servers and disk whole column connection, adopt cluster file system management, realize data sharing through network file system, video server and media system. Fourth, the optical fiber switch is cancelled, and the file server and disk array are connected directly with the storage controller, which eliminates the delay caused by bus or switch mode. Fifth, the metadata server is abolished, the metadata server is replaced by the file server, and the metadata and program data sharing data channels are shared, which further simplifies the hardware structure. In the course of the realization of the new vision high definition secondary storage system, two test schemes are designed, and the performance of the secondary storage system after completion is tested to ensure that the new system meets the design requirements. Finally, we realize the data sharing of the secondary storage system and the automatic migration of the program material self-financing system from the secondary storage system to the broadcast video server, which simplifies the secondary storage system architecture. Make the broadcast system more open and flexible. The network broadcast system has been applied to the new visual HDTV broadcasting system. The system has been running steadily since it was put into use in December 2012, and the broadcast quality has been unanimously recognized by the majority of viewers.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN948.13

【参考文献】