Audio　and　video　data　are　the　important　information　carriers　for　streaming　media　application　technology.　The　many　different　media　formats　cause　much　inconvenience　for　streaming　media　in　real-time　conversion　of　applications,　such　as　speech　recognition.　and　online-on-demand.　The　traditional　solution　commonly　used　is　data-into-document　conversion.　However,　this　method　cannot　meet　the　requirements　in　real-time　and　general　applications.　In　this　paper　a　new　general　link　structure　based　on　DirectShow　technology　is　introduced　that　can　he　applied　in　real-time　conversion　for　streaming　media　data.