H.264 is a new generation of video compression standard with high compression efficiency.It can achieve high quality of video screen and good ability to adapt to the network.DirectShow is a multimedia programming interface based on COM technology,which is a very good multimedia design framework.In recent years,H.264 video compression techniques was used more widely,the SDK of DirectShow absent h.264 decode filter.This paper focuses on the design and implementation of H.264 decoder filter based on DirectShow...