| The steady advancement of technology in the field of computer network and multimedia has become a strong impetus to the development and popularization of the networked multimedia applications.But on the other hand,the best-effort service based on IP provided by Internet isn't suitable for the transmission of video information.The playback effect of video information is always affected by the fluctuation of network states.QoS is difficult to be guaranteed.Coming from a video transmission need in networked multimedia application, the research project the thesis discusses is to research an RTP-based video transmission control method, which can adapt to the changes of network states. The thesis includes the following four parts:Firstly, fast development of IP network makes transmission of digital video information real. This thesis analyzes stream media technology and video compression coding technology. H.264 provides better compression performance and improves support for reliable network transform.Secondly, transporting streaming media through network must touch on transmission protocols inevitably. Real-time transport protocols are pivotal technology in the streaming media system. This thesis lucubrates the contents and characters of RTP and thinks that RTP is well suitable for the video transmission.Thirdly, about rate control during video transmission, this thesis analyzes several control methods and ideas, puts forward an RTP-based source video transmission control policy. This policy can make video transmission rate of sender automatically adaptive to the changes of network states and efficiently reduces network congestion.Fourthly, The thesis study technologies relate to embedded video surveillance system, and design the system. We are focused on video transmission of embedded video surveillance system. T... |
