传送流无缝拼接技术  

Seamless Splicing Technology of Transport Streams

作　　者：王立[1] 郑冰洋[2] 滕建辅[3] 刘昱[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072 [2]华为海思半导体有限公司,北京100094 [3]天津商业大学信息工程学院,天津300134

出　　处：《天津大学学报》2007年第12期1397-1402,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(60602033);天津市自然科学基金重点资助项目(07JCZDJC6800)

摘　　要：明确了在MPEG-2传送流(TS)无缝拼接技术中拼接点选择、信息一致性、音视频同步和缓冲区溢出等关键问题,并针对上述问题提出了基于系统层和基于基本层的无缝拼接方案.基于系统层的方案算法简单,计算量小,运算速度快,但对拼接点的选择要求较高,灵活性较差;基于基本层的方案能够实现以帧为单位的无缝拼接,可以随意选择拼接点,但需用到转换编码技术,算法较复杂,计算量较大.实验表明,2种方案都可以实现TS流无缝拼接,得到的拼接流符合MPEG-2标准.Two seamless splicing methods based on system and elementary level were presented in this paper. The key problems of splicing such as selection of splicing point, synchronization between audio and video, and buffer overflow were also discussed. The system-level-based method has simple arithmetic with fast computed speed, but is not flexible for its high demand of choosing splicing points, while the elementary-level-based method can randomly choose splicing points for its frame-based concept, but it uses transcoding technology which results in complexity of its arithmetic and computation. In our experiments, the output streams using the two methods to splice are all seamless and well compatible with MPEG-2 standard.

关 键 词：数字电视 MPEG 传送流 无缝拼接 

分 类 号：TN919.81[电子电信—通信与信息系统]