For the purpose of online content monitoring on P2P-TV, this paper firstly made a short introduction to the monitoring system of P2P-TV. Then according to the fact that PPTV utilized ASF to transmit data and that peers obtained data from each other by UDP method, based on the accurate identification of platform and channel of P2P-TV, this paper identified the audio/video data packets in the process of data transmission, and then acquired the serial numbers of those packets, the length of audio/video data, the beginning and ending of audio/video data in each packet, finally extracted the audio/video data online , recovered them to media files and implemented content detection.%为实现对P2P-TV应用的实时内容检测,简要介绍了P2P-TV监控系统对P2P-TV平台与频道的精细识别,针对PPTV采用ASF流媒体格式进行数据流传输、节点之间通过UDP协议获取数据,在精确识别出平台与频道的基础上,识别出数据传输过程中的A/V数据包,获知A/V数据包的序号、A/V数据的长度及起始终止位置,通过在线将A/V数据提取并还原为媒体文件并进行内容检测.
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