CN111641877A - Video gateway transmission method and system - Google Patents
Video gateway transmission method and system Download PDFInfo
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- CN111641877A CN111641877A CN202010501439.8A CN202010501439A CN111641877A CN 111641877 A CN111641877 A CN 111641877A CN 202010501439 A CN202010501439 A CN 202010501439A CN 111641877 A CN111641877 A CN 111641877A
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- packet loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention relates to the technical field of multimedia transmission, in particular to a video gateway transmission method and a video gateway transmission system. The method is applied to a video gateway transmission system, and comprises the following steps: monitoring a video streaming conversion state of a video gateway; receiving a video stream transmitted after the conversion of the video gateway; distributing the video stream to a downstream terminal according to a preset distribution rule, and monitoring packet loss feedback information of the downstream terminal; and receiving packet loss feedback information of the downstream terminal, and retransmitting the lost data packet to the downstream terminal according to the packet loss feedback information of the downstream terminal. In the process of video transmission and distribution, the invention defines the packet loss feedback mode and adopts the RIST protocol to carry out effective distribution, only carries out feedback retransmission when packet loss occurs, if no packet loss occurs, the receiver does not communicate with the sender, thereby ensuring low distortion and low time delay of the video while stably and effectively transmitting the video by using the Internet.
Description
Technical Field
The invention relates to the technical field of multimedia transmission, in particular to a video gateway transmission method and a video gateway transmission system.
Background
With the improvement of living standard of people and the popularization and development of the internet, the transmission technology of videos in the internet is more mature. Among them, viewing video using the internet is the most dominant video transmission means among more and more business entities and individual users. However, the current video quality is seriously influenced by network bandwidth and network congestion environment, the problems of video distortion and high time delay are easy to occur, and the use experience of internet video users is greatly influenced.
Disclosure of Invention
The present invention provides a video gateway transmission method and system for overcoming at least one of the above-mentioned drawbacks (shortcomings) of the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a video gateway transmission method is applied to a video gateway transmission system, and comprises the following steps:
monitoring a video streaming conversion state of a video gateway;
receiving a video stream transmitted after the conversion of the video gateway;
distributing the video stream to a downstream terminal according to a preset distribution rule, and monitoring packet loss feedback information of the downstream terminal;
and receiving packet loss feedback information of the downstream terminal, and retransmitting the lost data packet to the downstream terminal according to the packet loss feedback information of the downstream terminal.
Further, the video stream transmitted after the conversion by the video gateway is a TS stream.
Further, the monitoring video gateway video stream conversion state specifically includes:
the video gateway receives the AV video stream and converts the AV video stream into TS video stream;
and the server monitors the conversion condition of the video gateway and receives the TS video stream sent by the video gateway.
Further, the distributing the video stream to the downstream terminal according to the preset distribution rule and monitoring packet loss feedback information of the downstream terminal further includes:
and if the packet loss situation does not occur in the downstream terminal, the downstream terminal does not communicate with the sender.
Further, the video stream sent after the conversion by the video gateway is distributed through the RIST protocol.
Further, the streaming protocol of the RIST protocol uses RTP protocol to cooperate with RTCP protocol.
Further, the sending the missing data packet to the downstream terminal again specifically includes:
the lost data packet is recovered through a NACK protocol.
Further, the transmission of the video stream adopts encryption transmission, and the encryption transmission adopts a PSK encryption transmission mode.
The invention also provides a video gateway transmission system, which comprises
The video gateway is used for receiving the AV video stream, converting the AV video stream into a TS stream and then transmitting the TS stream; and
and the video distribution device is used for receiving the TS stream sent by the video gateway, distributing the TS stream to the downstream terminal according to a preset rule, monitoring and receiving packet loss feedback information sent by the downstream terminal, and performing retransmission operation according to the packet loss feedback information.
Further, the video distribution apparatus includes:
the server is used for monitoring and receiving the TS converted by the video gateway, distributing the TS and monitoring and recovering packet loss feedback data;
and the receiving module is used for being in communication connection with the server, receiving the TS stream sent by the server, sending the TS stream to a specific downstream terminal, monitoring and receiving packet loss feedback data and feeding the packet loss feedback data back to the server.
Further, the receiving module and the server are in communication connection through the internet.
In the process of video transmission and distribution, the invention defines the packet loss feedback mode and adopts the RIST protocol to carry out effective distribution, only carries out feedback retransmission when packet loss occurs, if no packet loss occurs, the receiver does not communicate with the sender, thereby ensuring low distortion and low time delay of the video while stably and effectively transmitting the video by using the Internet.
Drawings
Fig. 1 is a flow chart of a video gateway transmission method according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a detailed step of step 101 according to an embodiment of the present invention.
Fig. 3 is a block diagram of a video gateway transmission system according to an embodiment of the present invention.
Fig. 4 is a specific flowchart of a video gateway transmission system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Fig. 1 shows a flow chart of a structure of a video gateway transmission method provided by an embodiment of the present invention.
As shown in fig. 1, this embodiment provides an automobile panorama calibration method, which is applied to a video gateway transmission system, and the method includes the following steps:
101. and monitoring the video streaming conversion state of the video gateway.
102. And receiving the video stream transmitted after the conversion by the video gateway.
The server monitors the video stream conversion state of the video gateway in real time, when the video gateway has AV stream (Audio and video, Audio and image) input, the video gateway converts the AV stream, sends the converted video stream to the server, and meanwhile, the server receives the AV stream of the video gateway and carries out subsequent distribution.
Preferably, the video gateway converts the AV Stream into a TS Stream (video Stream file format of DVD), and transmits the TS Stream to the server.
103. And distributing the video stream to the downstream terminal according to a preset distribution rule, and monitoring packet loss feedback information of the downstream terminal.
The server determines whether to perform video distribution according to the request of the downstream terminal and whether the request meets the distribution requirement, distributes the video stream to the downstream terminal through the receiving module after determining the distribution, and simultaneously monitors whether the packet loss phenomenon exists in the downstream terminal.
104. And receiving packet loss feedback information of the downstream terminal, and retransmitting the lost data packet to the downstream terminal according to the packet loss feedback information of the downstream terminal.
When the downstream terminal has a packet loss phenomenon, the downstream terminal sends packet loss feedback and submits a retransmission request, and the server receives packet loss feedback information of the downstream terminal and retransmits the lost data packet according to the lost data packet and the request, so that low distortion and low delay of video distribution are ensured.
Fig. 2 shows a flowchart of the specific steps of step 101 of the present embodiment.
In some embodiments, as shown in fig. 2, the monitoring of the video gateway video stream conversion state specifically includes:
201. the video gateway receives the AV video stream and converts the AV video stream into a TS video stream.
202. And the server monitors the conversion condition of the video gateway and receives the TS video stream sent by the video gateway.
And the video gateway receives the AV video stream, converts the AV video stream into a TS stream, and sends the TS stream to a server for subsequent distribution after the conversion is finished. And after the video gateway converts and receives the TS stream, the server receives the TS stream sent by the video gateway and then carries out subsequent distribution.
In some embodiments, the distributing the video stream to the downstream terminal according to the preset distribution rule, and monitoring packet loss feedback information of the downstream terminal further includes:
and if the packet loss situation does not occur in the downstream terminal, the downstream terminal does not communicate with the sender.
The main purpose of the steps is that the receiving party communicates with the sending end only under the condition of packet loss, reports the condition of packet loss and requests retransmission, thereby avoiding video distortion. And under the condition of no packet loss, the receiver does not need to feed back a signal to the sender, so that the transmission market can be effectively reduced, the transmission delay is reduced, and the transmission efficiency is improved.
In some embodiments, the video Stream transmitted after the conversion by the video gateway is distributed through a RIST protocol (reliable internet streaming protocol). More preferably, the streaming Protocol of the RIST Protocol uses a Real Time Protocol (RTP) Protocol to cooperate with a Real Time transport control Protocol (RTPControl Protocol). The video gateway transmission is effectively distributed through the RIST protocol, and the RIST protocol can selectively and effectively feed back after distribution, namely, the request retransmission is fed back only under the condition of packet loss, thereby ensuring the low distortion and low time delay of the video transmission.
The RIST video distribution server can effectively execute the video gateway transmission method, and effectively transmit the video stream in a TS stream mode, thereby ensuring low distortion and low time delay of video transmission.
More specifically, in the RIST video distribution, at the transmitting end, RTCP uses SR (Sender Report) and CNAME (canonical name), and the receiving end uses RR (Receiver Report) and CNAME, and multiplexes RTP and RTCP into a single socket.
In some embodiments, the sending the missing data packet to the downstream terminal includes:
the lost data packet is recovered by a NACK protocol (Non-acknowledgement, packet loss retransmission).
Specifically, the RIST system uses a NACK-based selective retransmission protocol to recover packet loss, and to reduce bandwidth occupation and timeliness of transmission, the receiver does not communicate with the sender unless packet loss is discovered. And once the downstream terminal detects the packet loss, the receiving party requests to retransmit the lost data packet.
In some embodiments, the transmission of the video stream is performed by using encrypted transmission, and the encrypted transmission is performed by using a PSK encrypted transmission method, specifically, for better user experience, in this embodiment, the encrypted transmission specifically includes: s1, establishing a tunnel at any end; s2, sender sends Nonce (Number once, a non-repeating random Number value used once) in sequence and header; s3, the receiver decrypts by using the passphrase and the Nonce; s4, rolling the sending program in sequence to send a new Nonce; s5, the receiver checks the Nonce and regenerates the key in case of any change.
The video gateway method in the embodiment has the advantages that in the process of video transmission and distribution, the packet loss feedback mode is defined, the RIST protocol is adopted for effective distribution, feedback retransmission is carried out only when packet loss occurs, and if packet loss does not occur, the receiver does not communicate with the sender, so that the low distortion and low delay of the video are ensured while the internet is used for stably and effectively transmitting the video.
Fig. 3 shows a block diagram of the video gateway transmission system according to the present embodiment.
As shown in fig. 3, the present embodiment further provides a video gateway transmission system, which includes a video gateway and a video distribution apparatus. The video gateway is mainly used for receiving AV video stream, converting the AV video stream into TS stream and then sending the TS stream; the video distribution device is used for receiving the TS stream sent by the video gateway, distributing the TS stream to the downstream terminal according to a preset rule, monitoring and receiving packet loss feedback information sent by the downstream terminal, and performing retransmission operation according to the packet loss feedback information.
In some embodiments, referring to fig. 4, the video distribution apparatus specifically includes a server and a receiving module. The server is used for monitoring and receiving the TS converted by the video gateway, distributing the TS and monitoring and recovering packet loss feedback data. And the receiving module is used for being in communication connection with the server, receiving the TS stream sent by the server, sending the TS stream to a specific downstream terminal, monitoring and receiving packet loss feedback data and feeding the packet loss feedback data back to the server. Specifically, preferably, the server is an RIST video distribution server, and the receiving module is an RIST receiving module.
In some embodiments, the receiving module and the server are in communication connection through the internet, that is, after receiving the TS stream of the video gateway, the server sends the TS stream to the receiving module through the internet, and after receiving the TS stream, the receiving module sends the TS stream to the downstream terminal and monitors the packet loss condition of the downstream terminal, thereby completing effective transmission of the video.
The video gateway transmission system has the advantages that the video gateway transmission system can convert video streams into TS streams, distribute the TS streams through the RIST video distribution server, perform specific packet loss processing on the videos through the RIST protocol, reduce time delay, ensure video quality, solve the problem that the current video quality is seriously influenced by network environment, and improve market competitiveness of the video gateway transmission system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A video gateway transmission method is applied to a video gateway transmission system, and comprises the following steps:
monitoring a video streaming conversion state of a video gateway;
receiving a video stream transmitted after the conversion of the video gateway;
distributing the video stream to a downstream terminal according to a preset distribution rule, and monitoring packet loss feedback information of the downstream terminal;
and receiving packet loss feedback information of the downstream terminal, and retransmitting the lost data packet to the downstream terminal according to the packet loss feedback information of the downstream terminal.
2. The video gateway transmission method according to claim 1, wherein the video stream transmitted after being converted by the video gateway is a TS stream.
3. The video gateway transmission method according to claim 2, wherein the monitoring of the video gateway video stream transition state specifically includes:
the video gateway receives the AV video stream and converts the AV video stream into TS video stream;
and the server monitors the conversion condition of the video gateway and receives the TS video stream sent by the video gateway.
4. The video gateway transmission method according to claim 1, wherein the distributing the video stream to the downstream terminal according to the preset distribution rule and monitoring packet loss feedback information of the downstream terminal further comprises:
and if the packet loss situation does not occur in the downstream terminal, the downstream terminal does not communicate with the sender.
5. The video gateway transmission method according to any one of claims 1 to 3, wherein the video stream transmitted after the conversion by the video gateway is distributed via the RIST protocol.
6. The video gateway transmission method according to claim 5, wherein the streaming protocol of the RIST protocol uses RTP protocol in cooperation with RTCP protocol.
7. The video gateway transmission method according to claim 5, wherein said resending the missing data packet to the downstream terminal specifically comprises:
the lost data packet is recovered through a NACK protocol.
8. The video gateway transmission method according to claim 5, wherein the transmission of the video stream is encrypted transmission, and the encrypted transmission is PSK encrypted transmission.
9. A video gateway transmission system, comprising
The video gateway is used for receiving the AV video stream, converting the AV video stream into a TS stream and then transmitting the TS stream; and
and the video distribution device is used for receiving the TS stream sent by the video gateway, distributing the TS stream to the downstream terminal according to a preset rule, monitoring and receiving packet loss feedback information sent by the downstream terminal, and performing retransmission operation according to the packet loss feedback information.
10. The video gateway transmission system according to claim 9, wherein said video distribution means comprises:
the server is used for monitoring and receiving the TS converted by the video gateway, distributing the TS and monitoring and recovering packet loss feedback data;
and the receiving module is used for being in communication connection with the server, receiving the TS stream sent by the server, sending the TS stream to a specific downstream terminal, monitoring and receiving packet loss feedback data and feeding the packet loss feedback data back to the server.
11. The video gateway transmission system of claim 9, wherein the receiving module and the server are communicatively coupled via the internet.
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| CN202010501439.8A CN111641877A (en) | 2020-06-04 | 2020-06-04 | Video gateway transmission method and system |
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| CN202010501439.8A CN111641877A (en) | 2020-06-04 | 2020-06-04 | Video gateway transmission method and system |
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Application publication date: 20200908 |