Construction And Optimization Of Yunnan Radio And Television Cloud Transcoding System

Due to the popularity of smart portable devices,the types of TV programs receiving terminals are diversified,which puts forward new requirements for media operators:each site needs to provide a large number of multi-format,multi-rate video programs.In order to meet this requirement,three problems need to be solved.Firstly,in order to ensure the smooth reception of video programs,it is necessary to ensure the stability and reliability of front-end source access.Secondly,video transcoding is an extremely expensive work of computing resources,to build a large capacity transcoding platform needs to invest a lot of human and financial resources,resources consumption and management operation and maintenance issues need to be considered;Thirdly,for video services,network delay affects the user's viewing experience.As the scale of the network increases,the network situation becomes more and more complex,it is necessary to find a more adaptable routing algorithm.Based on the construction process of Yunnan Radio and TV Station's cloud transcoding system and the requirements of high transcoding quality,large throughput,reliability,completeness and expansibility of the system,this paper studies and draws lessons from the foundation of video transcoding service construction at home and abroad by means of visiting and exchanging,technical training,consulting materials and theoretical analysis.On the basis of satellite receiving and scheduling,routing switching and virtualization,a multi-format real-time video transcoding system with high quality and high throughput is designed and constructed,which ensures the reliability of the system source and solves the problem of the operation,maintenance and expansion of the video transcoding system.And bionic routing algorithm is introduced,by combined with ant colony algorithm and multicast QoS model,an effective solution to the problem of how to adapt to the changing network situation is proposed.The main work of this paper is as follows:(1)This paper introduces the elements of satellite receiving system construction,multicast technology and traditional routing algorithm,QoS routing model,virtualization technology advantages and applications,and provides a theoretical basis for the subsequent demonstration process.(2)This paper systematically demonstrates the reliability of satellite receiving and dispatching system,the completeness of cloud transcoding platform and the openness of transmission network design.(3)A multicast routing QoS algorithm with strong network adaptability is proposed by combining the QoS routing model with the ant colony algorithm.Considering various QoS constraints,the algorithm calculates the multicast routing using the probabilistic routing method.The simulation results of the optimized routing algorithm are verified and compared with the traditional routing routing algorithm.(4)Based on ant colony multicast(ACM)QoS algorithm,the existing transmission network is optimized and reformed,and the optimized transmission network is evaluated.