在媒体流传输过程中，首先，数据源对媒体数据的切割、形成RTP封装包是实现实时流式传输的起点。

With the media streaming transporting, the media source incise the media data, form the RTP framing packet, which is the starting point in realizing the real-time streaming transport.

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预存储的变比特率（VBR）压缩的视频网上流式传输，提供实时视频服务。

Variable bit rate (VBR) compressed video exhibits significant rate variability, this burstiness complicates the network bandwidth reserve, admission control and etc.

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