Patent ID: 6148005
Filing Date: 2000-11-14
Classification: H04L,H04N

Abstract:
A real-time, layered video multicast transmission system for transmitting video frames as a stream of encoded video data packets from a sender to one or more receivers over a network, wherein there exists a defined amount of time to recover lost packets said system comprising:means for generating one or more independent layers of video substreams out of said encoded video stream, each said one or more receivers capable of subscribing to one or more layers of said independent video substreams;means for transporting each of said independent video substreams over said network, said transporting means transporting each substream as an independent flow capable of being received by each said one or more receivers;control means for monitoring congestive state of said receiver to determine said receiver's capability for receiving each said video substream layer, said receiver selecting one or more of said independent video streams in accordance with the congestive state of said receiver wherein the system further comprising adaptive playback control means for extending said amount of time to recover packets lost during transport.