As a media service platform,The video broadcast system which integrates current advanced video processing technology and network transmission technology has become an indispensable and important part of subway multime...
详细信息
As a media service platform,The video broadcast system which integrates current advanced video processing technology and network transmission technology has become an indispensable and important part of subway multimedia *** the mature application of fast Ethernet and gigabit network in the subway network system,it has already become a mainstream to achieve high-definition and intelligent video screen in the subway *** the domestic subway on-board video broadcast system has succeed in playing high-definition video at present,there are still some problems such as video processing terminal crashes,low image clarity and poor playback,which seriously affect the passenger's journey *** cope with the above problems,this paper designed a high-definition video broadcast system on the basis of subway on-board condition to achieve the smooth playback of high-definition *** main contents of this paper are as follows:*** to the low encoding efficiency and high computational complexity of H.264 encoding standard,an optimization scheme of H264 intra prediction algorithm and encoder option is developed.A H.264 the fast prediction algorithm based on the combination of SATD and the image itself,the H.264 encoding options for the subway network frame is *** result of experiment show that the coding time of the algorithm is shortened by 50%on average after optimization and the efficient encoding of the video is realized on the server side under the condition of the quality of the video *** of packet loss and wrong packet transmission at the current in the process of video transmission UDP in subway on-board network,an optimization mechanism in the applicationlayer based on reliable UDP is *** results of experiments show that packet loss rate decreased by an average of 62.33%in the sudden change of the subway network environment based on the applicationlayer UDP video data *** the high-definiti
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