The Research Of Testing Multimedia Cloud Services

With the development of the multimedia transmission technology, multimedia onthe Internet has become the most popular Internet application. Every year, the networkmultimedia transmission traffic has accounted for over80%of the total Internettransmission. Given the consideration of the soaring traffic of online video, the Internetmultimedia services must be developed in the direction of distributed computing andshift towards multimedia cloud service model. The cloud computing model enables themultimedia service to adapt to more diversified user terminal equipments and providewider users with distributed multimedia storage and broadcasting service under thelimited Internet environment.However, since the IP network adopted a “best effort” operation mode to transmitmultimedia data, both the distribution of the cloud system resources and the allocationof network resources, should be considered to ensure the quality of multimedia cloudservices. The key to the development of multimedia cloud services technology is testingthe quality and proposing solutions to optimize the quality under the limited networkenvironment. Recently researches in this field are mainly focused on proposing thealgorithms to optimized QoS(quality of services) for one specific network parameters,but rarely care about how to test the QoS under the given network environment.This thesis designed an algorithm to test the degree of spatial and temporal damagebased on the adequate research on variety of algorithms to optimized quality ofmultimedia cloud services. Through constructing testing system platform of video cloudservice, the author collected network parameters and analyzed the relationship betweenthe alteration of the network transmission parameters and the damage of the multimediaquality, to assess the quality of multimedia cloud services which users can obtain underthe specific network environment. Compared with the existed multimedia quality ratingmodel, this algorithm which can test the degree of spatial and temporal damage has thefollowing features:1) In consideration of transmission delay、delay jitter and the packetloss rate, this measuring algorithm is more objective;2) This measuring algorithm,which have combined with buffering policy of the user’ receiver to design the algorithm and analysis the measurement, is closer to the actual application;3) The measuringalgorithm, which have paid attention to the synchronization performance of themultimedia cloud service, can be applied to the test of real-time interactive multimediacloud services;4) The damage probability, calculated from the measuring algorithm ofspatial and temporal damage degree, can be applied to grade the quality of multimediacloud service. Finally, this thesis designed a multimedia cloud service testing system.Through analyzing the data collected by the multimedia cloud service testing system,the results show that this algorithm can test the quality of multimedia cloud services,and has good applicability.