基于IP的DVB实时复用器中时序处理算法

DVB实时复用器在复用过程中需要对MPEG-2传输流(TS)中的时序关系进行处理,传统的处理算法只对MPEG-2时序中的PCR值进行了处理,所以在处理基于IP的DVB复用器中的时序关系时,传统算法存在着局限性.为了突破传统算法的局限,提出了一种不依赖于原始流中时序关系的校正算法,并且在对PCR进行校正的同时,按照视频缓冲检验器(VBV)的工作方式对DTS和PTS也进行了校正,使复用输出的TS流符合MPEG-2标准.最后,通过硬件平台和实验环境对所提出的时序处理算法进行了实际测试,并验证了算法的可行性.

Research on scheduling process algorithm in IP-based DVB multiplexer

MPEG-2 transport stream should be processed in the timing relationship when a real-time DVB multiplexer begins to multiplex the input video data. The traditional algorithms only deal with the PCR in the MPEG-2 scheduling. Therefore some limitations exist in the traditional algorithms when dealing with IP-based DVB multiplexer in timing relationship. To break through the limitation of traditional algorithms, this article presents an algorithm that does not depend on the scheduling of the original stream. Accompanying the PCR adjustment, the DTS and PTS are also adjusted in terms of the Video Buffer Verifier＇s working mode, so that the output transport stream is consistent with MPEG-2 standard. This proposed treatment algorithm was tested actually through the hardware platform and the experiment, and the feasibility of the algorithm was verified.