阅读说明：本技术 一种vod视频互动点播方法和系统 (VOD video interactive on-demand method and system ) 是由 秦幸坚 李力 王春华 于 2020-05-06 设计创作，主要内容包括：本发明公开了一种VOD视频互动点播方法,包括以下步骤：机顶盒经光纤双向网络向VOD服务器发送VOD点播请求；VOD服务器接收到点播请求后,经双向网络向机顶盒发送请求响应结果；当VOD服务器发送点播请求成功的消息后,同时告知机顶盒在特定频点的接收点播节目流,并将节目点播流推送给广播数据流复用光发送机,广播数据流复用光发送机通过光分配网,在对应的组播通道内将节目点播流广播至网络接收调谐器；网络接收调谐器过滤出点播节目,转发给机顶盒播放。本发明的一种基于IP广播技术的VOD视频互动点播系统,具有良好的带宽扩展性,可以极大拓展现有光纤双向接入系统的下行带宽,满足未来高品质VOD视频业务的带宽需求。(The invention discloses a VOD video interactive on-demand method, which comprises the following steps: the set-top box sends a VOD request to a VOD server through an optical fiber bidirectional network; after receiving the request, the VOD server sends a request response result to the set-top box through the bidirectional network; when the VOD server sends a message that the on-demand request is successful, the set-top box is informed of receiving the on-demand program stream at a specific frequency point, and the program on-demand stream is pushed to a broadcast data stream multiplexing optical transmitter, and the broadcast data stream multiplexing optical transmitter broadcasts the program on-demand stream to a network receiving tuner in a corresponding multicast channel through an optical distribution network; the network receiving tuner filters out the on-demand program and forwards the on-demand program to the set top box for playing. The VOD video interactive on-demand system based on the IP broadcasting technology has good bandwidth expansibility, can greatly expand the downlink bandwidth of the existing optical fiber bidirectional access system, and meets the bandwidth requirement of future high-quality VOD video service.)

1. A VOD video interactive on-demand method is characterized by comprising the following steps:

the set-top box sends a VOD request to the VOD server through the network receiving tuner and the upstream channel of the bidirectional network;

after receiving a VOD request sent by the set top box, the VOD server sends a request response result to the set top box through a downlink channel of the bidirectional network;

when the VOD server sends a message that the on-demand request is successful, the set-top box is informed to receive the on-demand program stream at a specific frequency point and pushes the on-demand program stream to the broadcast data stream multiplexing optical transmitter;

the broadcast data stream multiplexing optical transmitter broadcasts an on-demand program stream to the network receiving tuner in a corresponding multicast channel through an optical distribution network; and filtering the on-demand program by the network receiving tuner and forwarding the on-demand program to the set top box for playing.

2. The interactive VOD method as claimed in claim 1, wherein the request message of VOD transmitted from the set-top box carries the corresponding region code information; and when the VOD server succeeds in ordering the request, pushing the ordered program stream to an IP address corresponding to the area code in a unicast mode according to the area code information in the request message, namely the IP address of the broadcast data stream multiplexing optical transmitter.

3. The VOD video interactive on demand method according to claim 2, wherein when the VOD server sends a message that the on demand request is successful, the set top box is notified of receiving the on demand program stream at a specific frequency point and pushes the on demand program stream to the broadcast data stream multiplexing optical transmitter, specifically comprising:

after receiving the request, the VOD server replies a request response message to the set-top box through a downlink channel of the bidirectional network and the network receiving tuner;

and the VOD server sends a UDP/IPVOD video service message to the broadcast data stream multiplexing optical sender with the IP address corresponding to the area code information, wherein the destination port number of the UDP message corresponds to the planning frequency point of the IPQAM system.

4. The VOD video interactive on demand method according to claim 2, wherein the broadcast data stream multiplexing optical transmitter broadcasts the on demand program stream to the network reception tuner in the corresponding multicast channel through the optical distribution network; the method comprises the following steps that a network receiving tuner filters out on-demand programs and forwards the on-demand programs to a set top box for playing, and specifically comprises the following steps:

the broadcast data stream multiplexing optical transmitter realizes the compatibility of the prior IPQAM system by establishing and maintaining a frequency point and multicast channel address mapping table;

according to the mapping table of the frequency point and the multicast channel address, the broadcast data stream multiplexing optical transmitter transmits the received on-demand program stream to a corresponding multicast channel; and after receiving the VOD reply message from the VOD server, the set top box reports the channel address corresponding to the frequency point information to the network receiving tuner, and the network receiving tuner filters the video program to be requested according to the multicast address and the port number in the channel address and plays the video program by the set top box.

5. A VOD video-on-demand system comprising:

the request module of on demand, is used for the set-top box to receive the upstream channel of tuner and two-way network and send VOD on demand request to VOD server via the network;

the request response module is used for sending a request response result to the set-top box through a downlink channel of the bidirectional network after the VOD server receives a VOD request sent by the set-top box;

the push module is used for informing the set-top box of receiving the on-demand program stream at a specific frequency point and pushing the program on-demand stream to the broadcast data stream multiplexing optical transmitter after the VOD server sends the information that the on-demand request is successful;

the broadcasting module is used for broadcasting the on-demand program stream to the network receiving tuner in the corresponding multicast channel by the broadcast data stream multiplexing optical transmitter through the optical distribution network; the network receiving tuner filters out the on-demand program and forwards the on-demand program to the set top box for playing.

6. The VOD video interactive-on-demand system of claim 5, wherein the on-demand request module,

the request message unit is used for carrying corresponding area code information in a request message of a VOD request sent by the set top box; and when the VOD server succeeds in ordering the request, pushing the ordered program stream to an IP address corresponding to the area code in a unicast stream mode according to the area code information in the request message, namely the IP address of the broadcast data stream multiplexing optical transmitter.

7. The VOD video-on-demand system according to claim 6, wherein the push module specifically comprises:

the response unit is used for the VOD server to reply a request response message to the set-top box through a downlink channel of the bidirectional network and the network receiving tuner after receiving the request;

and the pushing unit is used for the VOD server to send the UDP/IP VOD video service message to the broadcast data stream multiplexing optical transmitter with the IP address corresponding to the area code information, wherein the destination port number of the UDP message corresponds to the planning frequency point of the IPQAM system.

8. The VOD video-on-demand system according to claim 6, wherein the playing module specifically comprises:

the new building and maintenance unit is used for establishing and maintaining a mapping table of a frequency point and a channel address by the broadcast data stream multiplexing optical transmitter, so that the compatibility of the existing IPQAM system is realized;

the broadcasting unit is used for broadcasting the data stream and multiplexing the optical transmitter to send the received video stream into a corresponding multicast channel according to the mapping table of the frequency point and the communication address; and after receiving the VOD reply message from the VOD server, the set top box converts the frequency point information into a channel address and reports the channel address to the network receiving tuner, and the network receiving tuner filters the video program to be requested according to the multicast address and the port number in the channel address and plays the video program by the set top box.

9. A communication transmission apparatus comprising a memory and a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, implements the method according to any of claims 1-4.

Technical Field

The invention relates to the technical field of broadcasting, in particular to a VOD video interactive on-demand method and a VOD video interactive on-demand system.

Background

Interactive television vod (video on demand) is a brand new video service for cable television networks, which gets rid of the space-time limitation of the traditional live television and provides users with viewing experience different from that of the traditional television. The user can carry out video on demand, time-shifted television, music on demand and the like according to own wishes. The VOD video-on-demand system mainly comprises a VOD front-end processing system, a transmission network and a user set-top box. However, with the development of video technology, the high-quality VOD video service provides new challenges for network bandwidth, such as 4K, 8K, and the high-quality video services such as AR/VR urgently need larger downlink bandwidth, so how to effectively implement high-speed large-scale high-quality VOD application becomes a research hotspot of a broadcast network.

The existing broadcast television network mainly has two VOD technologies. Firstly, the VOD video-on-demand service is realized by adopting an IPQAM technology based on RF radio frequency modulation. The IPQAM technology multiplexes, scrambles, modulates, converts frequency and the like the IP video stream from the VOD server, multiplexes the IP video stream and the live broadcast signal on a fixed planning frequency point, and transmits the signal to the set-top box through an optical fiber coaxial Hybrid (HFC) network. Although the existing IPQAM technology can partially relieve the pressure of VOD application on network bandwidth by moving IPQAM equipment down and reducing the number of concurrent users, due to the limitation of radio frequency resources, the carrying capacity of the technology for future high-quality VOD service is extremely limited. In addition, the modulation and demodulation technology of the IPQAM technology is complex, and the network operation and maintenance cost is high. Therefore, the IPQAM technology is difficult to meet the future VOD service requirement with high quality (such as 4K, 8K, AR/VR, etc.).

And the second is to adopt GPON/EPON technology to realize VOD service through IPTV unicast mode. For a broadcast and television operator, because the bandwidth of the live broadcast service (DVB live broadcast) + the bandwidth of the VOD service, most of the downlink bandwidth of a GPON/EPON system is occupied, and especially the requirements of high-quality VOD and DVB live broadcast services on the bandwidth are larger, the residual bandwidth reserved for the bidirectional access service is few. Although the problem can be solved by upgrading the network technology to a 10G or 100G GPON/EPON system, the simple network upgrade not only causes the network construction cost to increase greatly, but also the uplink bandwidth after the system upgrade cannot be fully utilized.

Disclosure of Invention

In view of the foregoing defects in the prior art, the technical problem to be solved by the present invention is to provide a VOD video interactive on-demand method and system based on IP broadcasting technology, which can support thousands of VOD users to perform on-demand services of standard definition television, high definition television, 4K and above (8K/VR/AR) video programs without being limited by RF frequency bandwidth. When the VOD bandwidth demand is increased, the network equipment does not need to be updated, and only the bandwidth configuration of the IP broadcasting system needs to be dynamically adjusted to increase the bandwidth proportion of the VOD service.

In order to achieve the above object, the present invention provides a VOD video interactive on demand method, comprising the steps of:

a Set Top Box (STB) transmitting a VOD on demand request to a VOD server via a network reception Tuner (IP Tuner) and an upstream channel of a bidirectional network;

after receiving a VOD request sent by the set-top box, the VOD server sends a request response result to the set-top box through a downlink channel of the bidirectional network;

when the VOD server sends a message that the on-demand request is successful, the set-top box is informed of receiving the on-demand program stream at a specific frequency point, and the on-demand program stream is pushed to a broadcast data stream multiplexing optical transmitter (DLT);

the broadcast data stream multiplexing optical transmitter broadcasts the on-demand program stream to a network receiving Tuner (IP Tuner) in a corresponding multicast channel through an Optical Distribution Network (ODN); and filtering the on-demand program by the network receiving tuner and forwarding the on-demand program to the set top box for playing.

Further, a request message of VOD ordering sent by the set top box carries corresponding area code information; when the VOD server succeeds in ordering the request, the VOD server pushes the ordered program stream to the IP address corresponding to the region code in a unicast mode according to the region code information in the request message, namely the IP address of the broadcast data stream multiplexing optical transmitter.

Further, when the VOD server sends a message that the on-demand request is successful, the VOD server informs the set-top box to receive the on-demand program stream at a specific frequency point, and pushes the on-demand program stream to the broadcast data stream multiplexing optical transmitter, which specifically includes:

after receiving the request, the VOD server replies a request response message to the set-top box through a downlink channel of the bidirectional network and the network receiving tuner;

and the VOD server sends a UDP/IPVOD video service message to the broadcast data stream multiplexing optical sender with the IP address corresponding to the area code information, wherein the destination port number of the UDP message corresponds to the planning frequency point of the IPQAM system.

Further, the broadcast data stream multiplexing optical transmitter broadcasts the on-demand program stream to the network receiving tuner in the corresponding multicast channel through the optical distribution network; the method comprises the following steps that a network receiving tuner filters out on-demand programs and forwards the on-demand programs to a set top box for playing, and specifically comprises the following steps:

the broadcast data stream multiplexing optical transmitter realizes the compatibility of the prior IPQAM system by establishing and maintaining a frequency point and multicast channel address mapping table;

according to the mapping table of the frequency point and the multicast channel address, the broadcast data stream multiplexing optical transmitter transmits the received on-demand program stream to a corresponding multicast channel; and after receiving the VOD reply message from the VOD server, the set top box reports the channel address corresponding to the frequency point information to the network receiving tuner, and the network receiving tuner filters the video program to be requested according to the multicast address and the port number in the channel address and plays the video program by the set top box.

Another preferred embodiment of the present invention discloses a VOD video-on-demand system, comprising:

the request module of on demand, is used for the set-top box to receive the upstream channel of tuner and two-way network and send VOD on demand request to VOD server via the network;

the request response module is used for sending a request response result to the set-top box through a downlink channel of the bidirectional network after the VOD server receives a VOD request sent by the set-top box;

the push module is used for informing the set-top box of receiving the on-demand program stream at a specific frequency point and pushing the program on-demand stream to the broadcast data stream multiplexing optical transmitter after the VOD server sends the information that the on-demand request is successful;

the broadcasting module is used for broadcasting the on-demand program stream to a network receiving tuner in a corresponding multicast channel through a light distribution network (ODN) by a broadcast data stream multiplexing light transmitter (DLT); the network receiving tuner filters out the on-demand program and forwards the on-demand program to the set top box for playing.

Further, the on-demand request module may,

the request message unit is used for carrying corresponding area code information in a request message of a VOD request sent by the set top box; when the VOD server succeeds in ordering the request, the VOD server pushes the ordered program stream to the IP address corresponding to the area code in the form of unicast stream, namely the IP address of the broadcast data stream multiplexing optical transmitter.

Further, the pushing module specifically includes:

the response unit is used for the VOD server to reply a request response message to the set-top box through a downlink channel of the bidirectional network and the network receiving tuner after receiving the request;

and the pushing unit is used for the VOD server to send the UDP/IP VOD video service message to the broadcast data stream multiplexing optical transmitter with the IP address corresponding to the area code information, wherein the destination port number of the UDP message corresponds to the planning frequency point of the IPQAM system.

Further, the playing module specifically includes:

the new building and maintenance unit is used for establishing and maintaining a mapping table of a frequency point and a channel address by the broadcast data stream multiplexing optical transmitter, so that the compatibility of the existing IPQAM system is realized;

the broadcasting unit is used for broadcasting the data stream and multiplexing the optical transmitter to send the received video stream into a corresponding multicast channel according to the mapping table of the frequency point and the communication address; and after receiving the VOD reply message from the VOD server, the set top box converts the frequency point information into a channel address and reports the channel address to the network receiving tuner, and the network receiving tuner filters the video program to be requested according to the multicast address and the port number in the channel address and plays the video program by the set top box.

Furthermore, starting from the physical module group angle, the VOD video interactive on-demand system based on the IP broadcasting technology is composed of a video interactive on-demand service module, a VOD request and response bidirectional channel module and a VOD service unidirectional broadcasting channel module; wherein:

the video interactive on-demand service module consists of a VOD server and a terminal set-top box, wherein the set-top box sends an on-demand request to the VOD server, and the VOD server replies an on-demand response to the set-top box; after the request is approved, the VOD server sends VOD video service to the set-top box;

the VOD request and response bidirectional channel module consists of a bidirectional network and a network receiving tuner and is used for responding to an uplink request and a downlink response between the VOD server and the set top box; the bidirectional network may be constituted by a bidirectional access network of any physical transmission medium or technology; the network receiving tuner is responsible for transparently forwarding the request and response message between the bidirectional network and the set-top box;

the VOD service unidirectional broadcast channel module consists of a broadcast data stream multiplexing optical transmitter, an optical distribution network and a network receiving tuner; when the request is successful, the VOD server sends a request success response to the set-top box, and informs the set-top box of receiving the request program stream at a specific frequency point in a response message; the on-demand program stream is then pushed to a broadcast data stream multiplex optical transmitter. The broadcast data stream multiplexing optical transmitter transmits the received program stream into a corresponding multicast channel according to a mapping table of a frequency point and a multicast channel address, wherein the channel address is identified by a multicast address plus a UDP port number, and the program on-demand stream is broadcast to a network receiving tuner through an optical distribution network; and the network receiving tuner filters the on-demand program according to the channel address and forwards the on-demand program to the set top box for playing.

Further, the broadcast data stream multiplexing optical transmitter establishes and maintains a frequency point and multicast channel address mapping table so as to realize VOD service compatibility of the existing IPQAM system; the DLT periodically broadcasts a frequency point and multicast channel address mapping table and an area code through a specific channel of the unidirectional broadcast channel, so that the network receiving tuner can automatically acquire, store or update the information when being started; the broadcast data stream multiplexing optical transmitter transmits the received video stream to a corresponding multicast channel according to the mapping table of the frequency point and the multicast channel address; after receiving the request reply message of the VOD server, the set-top box converts the frequency point information into a multicast channel address, namely a multicast address and a port number, and reports the multicast channel address to the network receiving tuner, and the network receiving tuner filters out the video program of the channel and forwards the video program to the set-top box for playing.

A further preferred embodiment of the invention discloses a communication transmission device comprising a memory and a processor, and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, performs the method as defined in any one of the above.

Technical effects

The invention provides a VOD video interactive ordering system based on IP broadcast technology, which transmits VOD request and response messages based on a bidirectional channel of the existing access network, VOD video service is transmitted to user end equipment through a unidirectional IP broadcast system, and the user end equipment receives ordered video service in a corresponding multicast channel and forwards the ordered video service to an STB (set top box) for playing. The VOD video interactive ordering method provided by the invention can realize large-scale high-quality VOD service by adding a unidirectional IP broadcast system on the existing bidirectional network, such as a GPON/EPON system or an HFC system, and is an effective technology for providing high-quality VOD service by a broadcast television network or other existing optical fiber bidirectional networks.

The invention adopts the baseband light wave modulation technology, avoids the complex radio frequency modulation of the IPQAM technology supporting VOD service; radio frequency points are not occupied, the limitation of physical frequency point resources is avoided, and large-code-stream high-quality VOD services such as VOD services of 4K (40Mbps), 8K (80Mbps), VR (160Mbps) and the like can be supported; the method supports software dynamic bandwidth allocation, can increase VOD concurrent number or promote concurrent stream code rate by increasing the bandwidth proportion of VOD service in the service planning of an IP broadcasting system, and does not need to replace system hardware equipment; the downlink bandwidth of the bidirectional network system can be greatly expanded, and the requirement of future high-quality VOD video service is met; the IP video broadcast bandwidth disclosed by the invention has expansibility, and only the transmission rate of a physical layer is required to be changed without changing a system transmission protocol.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a system diagram of a VOD video interactive-on-demand method according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of VOD service encapsulation in IP broadcasting technology of a VOD video interactive on demand method according to a preferred embodiment of the present invention;

fig. 3 is a block diagram of an application system of a VOD video interactive ordering method compatible with IPQAM technology according to a preferred embodiment of the present invention.

Detailed Description