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In order to make Netmeeting and QuickTime player interoperable, we need to decide which audio and video codec we want to use. For the video codec, Netmeeting has H.261 and H.263, while Quicktime player only allows H.263. There are more audio codecs that are allowed on both Netmeeting and QuickTime player, f.g. gsm, g711, uaw, alaw, etc. The OpenH323 project can allow video format transmitted between players in H. 261 codec, while QuickTime player can only accept video format in the H.263 codec. We need to add H. 263 codec implementation into OpenH323 project. After we get video data in H.263 codec, we have learned that real time data is transmitted from QuickTime server to QuickTime player over the Internet through RTP/RTCP protocols. RTP protocol will carry real time data and run RTP on top of UDP to make use of its multiplexing and checksum services. Each RTP packet consists of a fixed RTP header, a possible empty list of contributing sources, and the payload data. RTCP protocol monitors the quality of service and coveys information about the participants in an on-going session. By defining RTP and RTCP header, each packet real-time audio and video data is able to send over RTP through UDP.
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