Multicast streaming

A multicast stream and transport stream technology, applied in the field of multicast stream transmission, can solve the problems of not considering the viewing volume, not supporting multicast, etc., to achieve smooth and effective transmission, and improve the effect of switching

Inactive Publication Date: 2017-02-22
BRITISH TELECOMM PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Multicast makes efficient use of the network when delivering the same content to multiple end devices at the same time, but often requires continuous allocation of network resources regardless of viewing volume
Additionally, many end devices such as some tablets and smartphones do not currently support multicast

Method used

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Examples

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Embodiment Construction

[0028] The invention is described herein with reference to specific examples. However, the present invention is not limited to these examples.

[0029] An example of the invention proposes a method of generating a multicast stream for transmission of video content such as live television. First, video content is encoded and segmented into time blocks. Each chunk is then encapsulated in one or more RTP packets depending on the size of the chunk, and each RTP packet is marked with a chunk tag to indicate in which of these packets the boundary between chunks lies. A multicast stream is then generated by encapsulating the RTP packets, preferably in IP packets using UDP. The chunk tag is provided through a dedicated field in the RTP payload header. The block label can be a block index or a block offset. Both can be used independently and in combination to determine boundaries between blocks.

[0030] figure 1 A system 100 including a content generator 102 in communication wit...

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Abstract

The invention presents a method of generating a multicast stream for transporting video content such as live TV. First, the video content is encoded, and segmented into temporal chunks. Each chunk is then encapsulated in one or more RTP packets, depending on the size of the chunk, and each RTP packet is marked with a chunk marker to indicate which of the packets the boundaries between chunks lie. The multicast stream is then generated by encapsulating the RTP packets, preferably using UDP in IP packets. The chunk marker is provided for by a special field in the RTP payload header. The chunk marker can be a chunk index or a chunk offset. Both, individually and in combination, can be used to determine the boundary between chunks.

Description

technical field [0001] The invention relates to the field of multicast streaming, and in particular to the generation of a multicast stream comprising a plurality of chunks for synchronization with a unicast stream. Background technique [0002] Live TV currently delivered over IP networks uses one of two completely different network technologies: one is a multicast-based network technology, and the other is a unicast-based network technology. With multicast delivery, a single multicast stream carrying content is simultaneously pushed from a content server to multiple network nodes, which replicate the content and forward it to any subsequent nodes or clients as needed. With unicast transmission, multiple content streams are pulled from the server, typically using HTTP over TCP and adaptive bitrate techniques, one for each device consuming the content. [0003] Multicasting makes efficient use of the network when delivering the same content to multiple end devices at the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/2343H04N21/438H04N21/6405H04N21/6408H04N21/845
CPCH04N21/23439H04N21/4383H04N21/6405H04N21/6408H04N21/8456H04L67/02H04L69/16H04N21/2187H04N21/84
Inventor I·克拉布特里M·尼尔森R·特恩布尔S·阿普尔比
Owner BRITISH TELECOMM PLC
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