A driving force behind this growth was the development of multipoint audio, video, and shared whiteboard conferencing applications. Because these real-time media are transmitted at a uniform rate to all the receivers in the network, the source must either run at the bottleneck rate or overload portions of the multicast distribution tree. In RLM, a source distributes a hierarchical signal by striping the different layers across multiple multicast groups.
Receivers then adjust their reception rate by simply joining and leaving multicast groups.
In this talk, I will describe a layered video compression algorithm which, when combined with RLM, provides a comprehensive solution for scalable multicast video transmission in heterogeneous networks. Internet video codecs while maintaining comparable run-time performance.