说明：  基于DirectShow的流媒体网上答疑系统 高等学校教学中传统的答疑方式往往是安排老师下班辅导，本文基于DirectShow的框架设计了一个不受时间 地点限制的的流媒体网上答疑系统.在约定的时间，老师和学生可以通过网络进行实时的视频会话.系统采用MPEG-4 的视频编解码器和RTP传输协议栈，及DirectShow技术实现流媒体的生成和传输服务.系统通过RTP/RTCP的反馈拥塞 控制来进行QoS控制和实现了自适应传输，具有硬件成本低，使用方便的特点.
(Higher school teaching way of traditional question-answering is often arrange counselling, based on teacher work designed a DirectShow framework with time Place the streaming media restrictions. On-line question-answering system in the agreed upon period of time, the teacher and students can real-time video through the network of conversation. System USES mpeg-4 The video codec and your RTP transmission protocol stack DirectShow technology, and realize the generation and transmission of streaming media service your RTP/RTCP. System through the feedback congestion )