Research On Synchronization Of Audio And Video Transmission And Its Realization In Virtual Desktop System

With the development of computer technology and network communication technology,it greatly promotes the application of multimedia in all aspects of people’s life.At present the multimedia technology has been gradually mature in the fields of network communication technology and computer science.However, the multimedia data will be inevitably destructed in the process of transmission due to network delay or hardware differences.therefore,how to keep and repair the synchronization relationship of multimedia at the receiving end has become one of the key technology of multimedia communication。First, this thesis detailed analyses several popular synchronization method,and then research some audio and video synchronization technology applied to remote virtual desktop delivery. At last design a relatively inferior race-based timestamp synchronization scheme based on feedback control method in which audio and video are put media unit on an associated time stamp on the position of the media unit at the relevant time marking determines its stamp. Audio and video units which has the same timestamp are appeared at the same time. So this method only mark realative timestamps at the sending end of the audio unit and video unit, thereby greatly reducing the complexit of obtaining synchronization information and difficulty of maintaining public timeline,On the other hand when it is displayed at the receiving end,in order to to achieve synchronization we put the audio important and only give up one frame or repeate play one frame.And it realize self feedback regulation function to adapt the changes of network conditions.Based on the above synchronization scheme, this thesis completed the detailed implementation of desktop delivery capabilities of the overall design in the virtual desktop system and given some specific module-level colleagues and some part of relevant code and flow chart.