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Method for implementing video request program under cover network multicasting
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A video-on-demand, overlay network technology, applied in two-way working systems, etc., can solve the problems of fewer streams, fewer user buffers, logical partitioning, and playback interruption of the lower nodes, and achieves the effect of ensuring playback continuity.
Inactive Publication Date: 2008-04-23
BEIJING JIAOTONG UNIV +1
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[0007] The purpose of the present invention is to make overlay network multicast, 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 overlay network multicast characteristics The needs of the user, the optimal waiting time for users, the least number of streams, and the least logical division of user buffers, so that users can order video programs online in real time and stably
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Embodiment 1
[0025] 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;
[0026] Step 1. When the user requests, whether the server has enough resources, if not, then notify the user that the request failed;
[0027] Step 2, judging whether it is the first request for this video, if not, then proceed to the step when a user requests to order the same video program;
[0028] Step 3, establish a multicast stream;
[0029] 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 of "when the user reports leaving or the server detects that the user has left suddenly"; For a request to suspend an operati...
Embodiment 2
[0071] 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.
[0072] Describe the node joining process and playback delay calculation, as shown in Figure 3. A multicast tree has been established in the VOD system such as Figure 3a , 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, and S makes X connect to user A according to the data they need To obtain data, 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 nodes is the largest. Such...
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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 multicaststream 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 realizing video-on-demand under overlay network multicast. It 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 a temporary data source , to reduce 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 us...
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