CN110545486B - Video signal transmission method, device, medium and terminal equipment - Google Patents
Video signal transmission method, device, medium and terminal equipment Download PDFInfo
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- CN110545486B CN110545486B CN201910718798.6A CN201910718798A CN110545486B CN 110545486 B CN110545486 B CN 110545486B CN 201910718798 A CN201910718798 A CN 201910718798A CN 110545486 B CN110545486 B CN 110545486B
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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
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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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
- H04N21/64—Addressing
- H04N21/6408—Unicasting
-
- 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
- H04N21/64322—IP
-
- 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
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
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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 discloses a video signal transmission method, which comprises the following steps: acquiring a video signal code stream based on IP multicast; establishing a cache region, and storing the video signal code stream in the cache region; compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number, and transmitting the data packet through a virtual private network; receiving the data packet and detecting whether the serial number in the data packet is complete in real time, if not, requesting to resend the data packet corresponding to the serial number to the cache region; the video signal code stream is cached in the cache region by setting the cache region, and the data packet with the missing serial number transmitted by the signal code stream is retransmitted to the cache region to request for retransmission, so that the problems of incomplete video data and unsafe data caused by network problems in the transmission process of videos in the internet are solved, and the complete transmission of the video data and the safety of data transmission are realized.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a video signal transmission method, apparatus, medium, and terminal device.
Background
The video signal is transmitted from end to end through the internet, the video signal of a transmitting end is converted into an RTP transmission unicast based on a UDP protocol, the video signal is transmitted from the transmitting end to a receiving end through the internet, and the video data is encapsulated and decapsulated based on an internet TCP/IP protocol in the transmission process.
In the current internet transmission of video signals, a video sending end converts the video signals into an RTP unicast transmission based on a UDP protocol, and the internet is responsible for transmitting the video signals to a receiving end. However, since the transmission of video signals based on the UDP protocol is not reliable, when the quality of the internet network is poor, a packet loss may occur, and the packet loss may cause a part of video images to be missing or a picture frame to be missing.
Disclosure of Invention
The invention provides a video signal transmission method, which is characterized in that a cache region is arranged, a video signal code stream is cached in the cache region, and a data packet with a missing serial number transmitted by the signal code stream is requested to be retransmitted to the cache region again, so that the problems of incomplete video data and unsafe data caused by network problems in the transmission process of a video in the internet are solved, and the complete transmission of the video data and the safety of data transmission are realized.
In order to solve the above technical problem, an embodiment of the present invention provides a video signal transmission method, including:
acquiring a video signal code stream based on IP multicast;
establishing a cache region, and storing the video signal code stream in the cache region;
compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number, and transmitting the data packet through a virtual private network;
and receiving the data packet and detecting whether the serial number in the data packet is complete in real time, and if the serial number in the data packet is incomplete, requesting to resend the data packet corresponding to the serial number to the cache region.
Preferably, the video signal transmission method further includes: setting caching time for the received data packet, sending a data packet sequence number request instruction of lost data to a caching area within the caching time, and requesting to resend the data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times.
Preferably, the buffering time is 5000 ms.
Preferably, the number of retransmissions is 3.
An embodiment of the present invention further provides a video signal transmission apparatus, including:
the data acquisition module is used for acquiring a video signal code stream based on IP multicast;
the data cache module is used for establishing a cache region and storing the video signal code stream in the cache region;
the data transmission module is used for compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number and transmitting the data packet through a virtual private network;
and the data detection module is used for receiving the data packet and detecting whether the serial number in the data packet is complete in real time, and if the serial number in the data packet is incomplete, the data packet corresponding to the serial number is requested to be retransmitted to the cache region.
Preferably, the video signal transmission apparatus further includes: a retry mechanism module, configured to set a buffering time for a received data packet, send a data packet sequence number request instruction of missing data to a buffering area within the buffering time, and request to resend a data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times.
Preferably, the buffering time is 5000 ms.
Preferably, the number of retransmissions is 3.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program; wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the video signal transmission method of any one of the above.
An embodiment of the present invention further provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the video signal transmission method according to any one of the above items when executing the computer program.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the video signal code stream is cached in the cache region by setting the cache region, and the data packet with the missing serial number transmitted by the signal code stream is retransmitted to the cache region to request for retransmission, so that the problems of incomplete video data and unsafe data caused by network problems in the transmission process of videos in the internet are solved, and the complete transmission of the video data and the safety of data transmission are realized.
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FIG. 1: the technical principle of the video signal transmission method in the embodiment of the invention is shown in the figure;
FIG. 2: a transmission principle structure diagram of a video signal transmission method in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, a video signal transmission method according to a preferred embodiment of the present invention includes:
s1, acquiring a video signal code stream based on IP multicast;
s2, establishing a buffer area, and storing the video signal code stream in the buffer area;
s3, compressing and packaging the video signal code stream in the cache region into a data packet containing continuous serial numbers, and transmitting the data packet through a virtual private network;
and S4, receiving the data packet and detecting whether the serial number in the data packet is complete in real time, if not, requesting to resend the data packet corresponding to the serial number to the cache region.
In this embodiment, the video signal transmission method further includes: s5, setting a buffering time for the received data packet, sending a data packet sequence number request instruction of the lost data to a buffering area within the buffering time, and requesting to resend the data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times. In this embodiment, the buffering time is 5000 ms. In this embodiment, the number of retransmissions is 3.
Correspondingly, an embodiment of the present invention further provides a video signal transmission apparatus, including:
the data acquisition module is used for acquiring a video signal code stream based on IP multicast;
the data cache module is used for establishing a cache region and storing the video signal code stream in the cache region;
the data transmission module is used for compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number and transmitting the data packet through a virtual private network;
and the data detection module is used for receiving the data packet and detecting whether the serial number in the data packet is complete in real time, and if the serial number in the data packet is incomplete, the data packet corresponding to the serial number is requested to be retransmitted to the cache region.
In this embodiment, the video signal transmission apparatus further includes: a retry mechanism module, configured to set a buffering time for a received data packet, send a data packet sequence number request instruction of missing data to a buffering area within the buffering time, and request to resend a data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times. In this embodiment, the buffering time is 5000 ms. In this embodiment, the number of retransmissions is 3.
The patent is a video transmission method with internet safety and stability, which is used for solving the problem of video data packet loss compensation occurring in the process of transmitting video signals from end to end in the internet and ensuring the data safety in the process of transmitting the video signals.
The present invention will be described in detail with reference to specific examples.
1. The sending end and the receiving end start virtual private network connection.
2. And (5) acquiring the video signal source. The video signal is from a broadcast television video code stream received by a broadcast television satellite receiving system, and is compressed and coded by an envivio coder or an ateme coder based on a video coding standard of HEVC/H.265 or an MPEG-4/H.264 video coding standard based on IP multicast.
3. And the video code stream buffering device at the sending end. The video code stream buffering device, in this example, a server of zhongke eosin I620-G20, acquires the source code stream of the UDP packet through the encoder output switch with the minimum routing access model number H3C S7610-X, and stores the code stream data in the memory of the server for a period of time (e.g., 5000 milliseconds), and when the maximum storage time is reached, the stored code stream data is discarded. The code stream buffer device provides the service of obtaining the code stream data packet. Because each data packet in the RTP protocol has a continuously increased sequence number, the sequence number is not repeated in a period of time, when a receiving end finds that packet loss occurs in a received RTP unicast (the sequence number is lost in a segment and is discontinuous) when receiving a video signal data packet, the receiving end sends a request to the buffer device to obtain an RTP packet with a specified sequence number, and when the buffer device finds that the packet exists in a code stream buffer of an internal memory, the receiving end directly returns the RTP packet. Therefore, even if the receiving end loses the data packet in the process of receiving the UDP unicast, the receiving end also has the opportunity to take back the data packet from the video buffering equipment at the sending end for splicing and completing.
4. And a video stream data buffering device at the receiving end. In this example, the server of zhongshiguang I620-G20, in order to retrieve the UDP unicast received by the video receiver to the buffering device when the video signal is lost, the UDP unicast received by the video receiver is buffered for a certain period (e.g. 5000 ms), and when the buffering time reaches the maximum time, the video signal is forwarded. The receiving end can judge whether the RTP sequence number in the UDP data packet is complete or not from the moment of receiving the data packet by the receiving software system, and when the RTP sequence number is found to be incomplete, the software system immediately sends a retransmission request to the sending end buffer server. As long as the receiving end can successfully obtain the lost data packet of the RTP sequence number within the maximum buffering time, the forwarded video signal is complete, and the problem that the video signal is lost due to transmission in the Internet can be solved. However, the signal transmitted through the internet is unstable, and in order to avoid the influence of packet loss on subsequent video data in the retransmission constitution of lost video data, the receiving end also sets a retry mechanism, that is, the receiving end does not receive the data packet within the time (the transmission time of data from the receiving end to the transmitting end) expected to receive the data packet, that is, the default is video data loss, and the receiving end caches the retransmission request of the data packet. And if the default setting is that the retransmission times are 3 times, the buffering time of the retransmission buffer zone is 5000 ms.
By the system, the problems of incomplete video data and unsafe data caused by network problems in the transmission process of the video in the Internet are solved.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program; wherein the computer program, when running, controls the device on which the computer-readable storage medium is located to execute the video signal transmission method according to any of the above embodiments.
The embodiment of the present invention further provides a terminal device, where the terminal device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor, when executing the computer program, implements the video signal transmission method according to any of the above embodiments.
Preferably, the computer program may be divided into one or more modules/units (e.g., computer program) that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc., the general purpose Processor may be a microprocessor, or the Processor may be any conventional Processor, the Processor is a control center of the terminal device, and various interfaces and lines are used to connect various parts of the terminal device.
The memory mainly includes a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like, and the data storage area may store related data and the like. In addition, the memory may be a high speed random access memory, may also be a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), and the like, or may also be other volatile solid state memory devices.
It should be noted that the terminal device may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the terminal device is only an example and does not constitute a limitation of the terminal device, and may include more or less components, or combine some components, or different components.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (8)
1. A video signal transmission method, comprising:
acquiring a video signal code stream based on IP multicast;
establishing a cache region, and storing the video signal code stream in the cache region;
compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number, and transmitting the data packet through a virtual private network;
receiving the data packet and detecting whether the serial number in the data packet is complete in real time, if not, requesting to resend the data packet corresponding to the serial number to the cache region;
setting caching time for the received data packet, sending a data packet sequence number request instruction of lost data to a caching area within the caching time, and requesting to resend the data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times.
2. The video signal transmission method according to claim 1, wherein the buffering time is 5000 ms.
3. The video signal transmission method according to claim 1, wherein the number of retransmissions is 3.
4. A video signal transmission apparatus, comprising:
the data acquisition module is used for acquiring a video signal code stream based on IP multicast;
the data cache module is used for establishing a cache region and storing the video signal code stream in the cache region;
the data transmission module is used for compressing and packaging the video signal code stream in the cache region into a data packet containing a continuous serial number and transmitting the data packet through a virtual private network;
the data detection module is used for receiving the data packet and detecting whether the serial number in the data packet is complete in real time, and if the serial number in the data packet is incomplete, the data packet corresponding to the serial number is requested to be retransmitted to the cache region;
a retry mechanism module, configured to set a buffering time for a received data packet, send a data packet sequence number request instruction of missing data to a buffering area within the buffering time, and request to resend a data packet corresponding to the sequence number; the sending times of the request instructions are not more than the preset retransmission times.
5. The video signal transmission apparatus of claim 4, wherein the buffering time is 5000 ms.
6. The video signal transmission apparatus according to claim 5, wherein the number of retransmissions is 3.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored computer program; wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the video signal transmission method according to any one of claims 1 to 3.
8. A terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the video signal transmission method according to any one of claims 1 to 3 when executing the computer program.
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