This paper compares and discusses the codec, the bus interface and the problems related to bandwidth in design and implementation of the full high-definition vehicle Passenger Information System (PIS), with emphasis on the comparison and analysis of the advantages of applying Video Decode and Presentation API for Unix (VDPAU) to the cab server and the performance improvement by applying the DM368 embedded codec to the passenger compartment. Meanwhile, problems brought about by using traditional Video Graphics Array (VGA) transmission under full high-definition vehicle PIS in the bus transfer interface are discussed. By using Ethernet and Digital Visual Interface (DVI) interfaces instead of the sub-screen device, these problems are effectively solved. Finally, experimental results for different video bandwidths using different encoding formats are obtained.%针对全高清车载乘客信息系统设计与实现中的编解码、总线接口和带宽等相关问题进行讨论,着重对比分析在司机室服务器采用VDPAU进行编解码的优势,以及在客室采用DM368嵌入式编解码带来的性能提高.讨论总线传输接口中传统VGA传输方式在全高清车载PIS系统环境下带来的相应问题,并提出采用以太网和DVI的接口而不再使用分屏器的有效解决方案针对不同编码格式下的视频带宽,给出实验测试结果.
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