Method for implementing video request program under cover network multicasting

A video-on-demand and overlay network technology, applied in the direction of two-way working system, etc., can solve the following problems such as interruption of playback, less number of streams, and less user buffer logic division, etc., to achieve the effect of ensuring playback continuity

Inactive Publication Date: 2006-01-11
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to make the overlay network multicast, and solve the problem that during the video program on-demand playback process, the non-leaf node users leave the phenomenon that the playback of the following nodes is likely to be interrupted, especially in line with the characteristics of online on-demand video programs and the overlay network group. According to the needs of broadcasting characteristics, the waiting time of users is optimal, the number of streams is the least, and the logical division of user buffers is the least, so that users can order video programs online in real time and stably

Method used

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  • Method for implementing video request program under cover network multicasting
  • Method for implementing video request program under cover network multicasting
  • Method for implementing video request program under cover network multicasting

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Experimental program
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Embodiment 1

[0024] Example 1, such as Figure 1b Shown, a kind of overlay network multicast under the present invention video on demand realization method has the following main steps:

[0025] Step 1. The user requests, whether the server has enough resources, otherwise, the user is notified that the request failed;

[0026] Step 2, judge whether it is the first request for this video, otherwise go to step 6;

[0027] Step 3, establish a multicast flow;

[0028] Step 4, maintain the normal transmission of the multicast stream, monitor the network and the status of the multicast group members, if you receive a request from the user to order the same video program, go to the step of "when there is a user request to order the same video program"; if it is detected If a user leaves, go to the step "when the user reports leaving or the server detects that the user leaves suddenly"; if a request from the user for VCR operation is received, go to the step "when the user requests VCR operation...

Embodiment 2

[0070] As shown in Figure 3, Figure 4 and Figure 5 As shown, the network multicast tree represents the video-on-demand method, and the time slice represents the multicast VCR process. The same assumptions are used as in Example 1.

[0071] Describe the node joining process and playback delay calculation, as shown in Figure 3. A multicast tree has been established in the VOD system as shown in Figure 3(a). At this time, users X and Y request to join, and the request is sent to the video server S. The data required by X can be obtained on A, and the data required by Y can be obtained on D. According to the data they need, S connects X to user A to obtain data, and Y connects to user D to obtain data. According to the proposed media stream scheduling method, during the user joining process, the playback delay of users closer to the root node can be smaller, and the playback delay can be increased step by step, while the playback delay of the leaf node is the largest. As sho...

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Abstract

This invention relates to a video selection realization method under network multicast, in which, a video server sets up a multicast stream for users when a video program is selected for the first time, when a user asks for adding a same video junction point, different play delays are introduced, the small junction point play delay is close to the root junction point and large one is in a distance from the junction point a multicast VCR operation method is used to realize quick advance and quick retreat user VCR operation finishes to merge into suitable multicast stream in the multicast VCT operation set. This invention can add the optimized user waiting time, useless flow number and user buffer zone logic unblocks to ensure continuous play of VOD system reduce the streams for realizing VCR greatly.

Description

Technical field [0001] The invention relates to a method for implementing video-on-demand under overlay network multicast, and belongs to the technical field of communication multicast. Background technique [0002] With the development of network technology, people can enjoy resource sharing in any place connected to the network. Video on demand (VOD) technology can meet people's various needs in work and entertainment, and it needs to develop in a direction that is more stable and serves more users. [0003] Overlay network multicast is a logical network built on the original physical network structure. User hosts are used as nodes to build multicast trees to complete data replication and forwarding, so that user hosts can store data in a decentralized manner as temporary data source, reducing server pressure. [0004] In the VOD system, the media server arranges the segmented storage of the media stream, and establishes media stream retrieval and transmission for the use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/173
Inventor 刘云霍晓宇李永昊卯玉成
Owner BEIJING JIAOTONG UNIV
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