CN111601180A - Distributed spliced large-screen video stream cluster synchronous display system based on PTS - Google Patents
Distributed spliced large-screen video stream cluster synchronous display system based on PTS Download PDFInfo
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- CN111601180A CN111601180A CN202010408787.0A CN202010408787A CN111601180A CN 111601180 A CN111601180 A CN 111601180A CN 202010408787 A CN202010408787 A CN 202010408787A CN 111601180 A CN111601180 A CN 111601180A
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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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
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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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- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a PTS-based distributed spliced large-screen video stream cluster synchronous display system, which comprises: the system comprises a multicast receiving module, a TS stream unpacking module, a video decoding module, a synchronous control module and a display module, wherein the multicast receiving module, the TS stream unpacking module and the video decoding module independently operate in a main node machine and each sub-node machine of the system; the multicast receiving module is used for receiving multicast data; the TS stream unpacking module unpacks the video stream from the composite signal stream and splices the video stream into a frame of video data to be input into the video decoding module; the video decoding module decodes a frame of video data spliced by the video streams to obtain the time stamp of the video streams; the synchronous control module is used for controlling the synchronous operation of the sub-node machine and the main node machine; and the display module performs format conversion on the time stamp of the decoded video stream and sends the time stamp to a display screen for display. The invention effectively solves the problems of video stream delay and disorder of the split display of the large screen of the distributed cluster.
Description
Technical Field
The invention relates to the technical field of synchronous display of spliced screens, in particular to a distributed spliced large-screen video stream cluster synchronous display system based on PTS.
Background
The existing large screen system is usually formed by splicing a plurality of small screens, and the large screen spliced display system is a set of display screen cluster and a set of information processing cluster based on a computer cluster. In the current large-screen splicing display system, parallel independent processing of each display unit is generally completed in a node machine mode. However, because each node in the cluster calculates independently, the load is different, and the network transmission has time delay, the problems of asynchronous information display, disordered display and the like of each node often occur, and when the cluster scale of the large spliced screen is larger, the problems are more serious.
In addition, society is continuously developing, and with breakthrough of digital video technology and network communication technology and continuous upgrade of chips and servers with high processing capacity, network high-definition video or large data visual data streams will become important information sources of large-screen display systems in the future. Compared with the data such as presentation files and pictures occupying most of the display contents of the spliced large-screen system at present, the video stream has the highest requirement and occupies the largest resources and flow in the transmission process, the synchronization problem of the cluster display is particularly outstanding, the video stream is dynamically transmitted, the video frame display of each node machine is asynchronous, the frame information displayed by the large screen is disordered, the display effect and the command decision are seriously influenced, and the spliced large-screen display system at present is a part to be improved urgently.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a PTS-based distributed tiled large-screen video stream cluster synchronous display system.
The distributed spliced large-screen video stream cluster synchronous display system based on the PTS is characterized by comprising the following steps: the system comprises a multicast receiving module, a TS stream unpacking module, a video decoding module, a synchronous control module and a display module, wherein the multicast receiving module independently operates in a main node machine and each sub-node machine of the system and is used for receiving multicast data; the TS stream unpacking module operates in the main node machine and each sub-node machine of the system independently and is used for unpacking the video stream (ES) from the composite signal stream (TS) and splicing the video stream into a frame of video data to be input into the video decoding module; the video decoding module operates in the main node machine and each sub-node machine of the system independently and is used for decoding one frame of video data spliced by the video streams to obtain a time stamp (PTS) of the video streams; the synchronous control module is used for controlling the synchronous operation of the sub-node machine and the main node machine; the display module runs in each sub-node machine of the system and is used for converting the format of a time stamp (PTS) of the decoded video stream and sending the video stream to a display screen for displaying according to the frame display information.
The PTS-based distributed spliced large-screen video stream cluster synchronous display system provided by the invention also has the following characteristics: the multicast receiving module is a buffer area with a fixed size.
The PTS-based distributed spliced large-screen video stream cluster synchronous display system provided by the invention also has the following characteristics: the TS stream unpacking module determines a frame of video data according to a payload _ unit _ start _ indicator flag in a TS stream header.
The PTS-based distributed spliced large-screen video stream cluster synchronous display system provided by the invention also has the following characteristics: the video decoding module adopts an open-source audio and video coding and decoding program to carry out video decoding.
The PTS-based distributed spliced large-screen video stream cluster synchronous display system provided by the invention also has the following characteristics: the video decoding module in the master node machine decodes the video stream to obtain a time stamp (PTS) of the video stream, and the PTS is recorded as an SPTS; a video decoding module in the child node machine decodes the video stream to obtain a time stamp (PTS) of the video stream, and the PTS is recorded as a CPTS; the synchronous control method run in the synchronous control module is as follows: step a, decoding the SPTS obtained in the main node machine, sending the SPTS to a cluster network in a multicast mode, and entering a message waiting state; b, after the sub-node machine receives the SPTS multicast data through the multicast receiving module, searching CPTS equal to the SPTS multicast data from the sub-node machine in a traversal mode, if the search is successful, sending a matching success message to the main node machine through the cluster network, otherwise, sending a matching failure message; step c, when the main node machine acquires the sub-node machine matching failure message, taking a decoded SPTS from the main node machine, and repeating the steps a to b; and when the main node machine obtains the successful matching information of all the sub-node machines, generating a frame display information in the main node machine, and sending the frame display information to all the sub-node machines through the cluster network in a multicast mode to complete video display.
The PTS-based distributed spliced large-screen video stream cluster synchronous display system provided by the invention also has the following characteristics: the system operates according to the following synchronous display method: step 1: the sub-node machine and the main node machine respectively receive a composite signal stream (TS) transmitted in a multicast mode through a multicast receiving module; step 2: after receiving the composite signal stream (TS), the sub-node machine and the main node machine respectively unpack the video stream (ES) from the composite signal stream (TS) through a TS stream unpacking module, and splice the video stream into a frame of video data to be input into a video decoding module; and step 3: video decoding modules in the sub-node machine and the main node machine respectively perform video decoding to obtain corresponding time stamps (PTS) of the frequency streams; and 4, step 4: the method comprises the steps that a synchronization control module is used for carrying out synchronization control on a sub-node machine and a main node machine, whether all the sub-node machines are successfully matched with a main node machine message or not is judged, when all the sub-node machines are successfully matched with the main node machine message, a frame display message is generated in the main node machine, and the frame display message is sent to all the sub-node machines through a cluster network in a multicast mode; and 5: and all the child node machines carry out format conversion on the successfully matched PTS through the display module and send the successfully matched PTS into a display screen for synchronous display according to the frame display message.
The invention has the following functions and effects:
the distributed spliced large-screen video stream cluster synchronous display system based on the PTS realizes synchronous display of distributed node machines by utilizing PTS timestamp information. In the system, a multicast receiving module, a TS stream unpacking module and a video decoding module are respectively arranged in each node machine, synchronous display control is carried out on each sub-node machine through a synchronous control module, synchronous display control of video streams in each sub-node machine in the system is realized, and finally the videos are synchronously displayed on a splicing large screen. The invention thoroughly solves the problems of video stream delay and disorder in the split display of the distributed cluster large screen; the number of the node machines is not limited, so that the splicing scale of a large screen is not limited; the method provides a feasible solution for the synchronous display of the video streams of the cluster large-screen splicing display system, and has a wide application prospect.
Drawings
Fig. 1 is a schematic hardware connection diagram of a PTS-based distributed tiled large-screen video stream cluster synchronous display system in an embodiment of the present invention;
FIG. 2 is a block diagram of a PTS-based distributed tiled large-screen video stream cluster synchronized display system in an embodiment of the present invention;
fig. 3 is a flowchart diagram of a PTS-based distributed tiled large-screen video stream cluster synchronous display system in an embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the following embodiments specifically describe the PTS-based distributed tiled large-screen video stream cluster synchronous display system of the present invention with reference to the accompanying drawings.
< example >
Fig. 1 is a schematic diagram of hardware connection of a PTS-based distributed tiled large-screen video stream cluster synchronous display system in an embodiment of the present invention.
As shown in fig. 1, in the PTS-based distributed tiled large-screen video stream cluster synchronous display system in this embodiment, a hardware device includes a main node machine and a plurality of sub node machines, the main node machine and the sub node machines are connected by a network switch, and a cluster network is established by the network switch. The large spliced screen wall is formed by splicing a plurality of small screens. The number of the sub-node machines is multiple, and each sub-node machine correspondingly controls the display of one or more small screens. The main node machine is responsible for scheduling management, the sub-node machines perform parallel computing processing, and finally the sub-node machines control the screen to display synchronously.
Fig. 2 is a block diagram of a PTS-based distributed tiled large-screen video stream cluster synchronous display system in an embodiment of the present invention.
As shown in fig. 2, the PTS-based distributed tiled large-screen video stream cluster synchronous display system in this embodiment includes: the system comprises a multicast receiving module 1, a TS stream unpacking module 2, a video decoding module 3, a synchronous control module 4 and a display module 5.
The multicast receiving module 1 operates independently in the main node machine and each sub-node machine of the system, and is used for receiving multicast data. The multicast receiving module 1 is a buffer with a fixed size. The buffer area is established in the system, so that data loss caused by the unreliability of the current User Datagram Protocol (UDP) is avoided. When running, each multicast receiving module 1 starts an independent thread, and the multicast receiving modules 1 in different node machines do not interfere with each other.
The TS stream unpacking module 2 operates in the main node machine and each sub-node machine of the system. Each node machine receives a composite signal stream (TS) in a multicast mode through a trunking network, the composite signal stream (TS) is composed of one or more programs, each program is composed of one or more original streams and other streams, the original streams and other streams are combined together, the composite signal stream (TS) comprises a video stream (ES), an Audio Stream (AS), a program special information stream (PSI) and other data packets, each packet has a unique identification number PID, a PAT table with the PID being 0 can be analyzed, a PID of the PMT table can be analyzed from the PAT table, a PID of a PES packet can be analyzed through the PMT table, and the packet header of the PES packet is removed to form the ES stream. The TS stream unpacking module 2 is configured to unpack a video stream (ES) from the composite signal stream (TS), determine a frame of video data according to a payload _ unit _ start _ indicator flag in a TS stream header, and splice the video stream (ES) into a frame of video data to be input to the video decoding module 3.
The video decoding module 3 operates in the main node machine and each sub-node machine of the system independently, and is used for decoding a frame of video data spliced by the video stream (ES) to obtain a time stamp (PTS) of the video stream. The video decoding module 3 adopts an open-source audio and video coding and decoding program to carry out video decoding. In the present embodiment, the video decoding module 3 adopts the FFmpeg codec. For a video frame, the video frame has a particular starting sequence. For example, a video frame in h.264 format starts with a sequence of 0 × 000 × 000 × 000 × 01 (or 0 × 000 × 000 × 01). The video decoding module 3 determines frame data by using this specific sequence as a boundary, i.e. the data between two sequences is divided into one frame.
And the synchronous control module 4 is used for controlling the synchronous operation of the sub-node machine and the main node machine.
The display module 5 runs in each sub-node machine of the system, and is configured to perform format conversion on a time stamp (PTS) of the decoded video stream, and send the decoded video stream to a display screen for display according to the frame display message. In this embodiment, the video stream data is decoded by the FFmpeg codec of the video decoding module 3, and is generally in YUV format, and the display module 5 converts the YUV format data into RGB format data, and then sends the RGB format data to the buffer area of the display screen, so as to complete the display.
Fig. 3 is a flowchart diagram of a PTS-based distributed tiled large-screen video stream cluster synchronous display system in an embodiment of the present invention.
As shown in fig. 3, the PTS-based distributed tiled large-screen video stream cluster synchronous display system of the present invention operates according to the following synchronous display method:
step 1: and the sub-node machine and the main node machine respectively receive the composite signal stream TS transmitted in a multicast mode through a multicast receiving module.
Step 2: after receiving the composite signal stream TS, the child node machine and the host node machine respectively unpack a video stream (ES) from the composite signal stream (TS) through a TS stream unpacking module, and splice the video streams into a frame of video data to be input to a video decoding module.
And step 3: and video decoding modules in the sub-node machine and the main node machine respectively decode videos to obtain corresponding time stamps (PTS) of the frequency streams.
And 4, step 4: and the sub-node machine and the main node machine are synchronously controlled through a synchronous control module.
The synchronous control method for the operation of the synchronous control module comprises the following steps: (for convenience of subsequent description, the video decoding module in the main node machine decodes to obtain the timestamp (PTS) of the video stream, which is denoted as SPTS, and the video decoding module in the sub-node machine decodes to obtain the timestamp (PTS) of the video stream, which is denoted as CPTS.)
a: and sending the SPTS obtained after decoding in the main node machine to a cluster network in a multicast mode, and entering a message waiting state.
b: after the sub-node machine receives the SPTS multicast data through the multicast receiving module, the CPTS which is equal to the SPTS multicast data is searched from the sub-node machine in a traversal mode, if the search is successful, a matching success message is sent to the main node machine through the cluster network, and if the search is not successful, a matching failure message is sent.
c: when the main node machine obtains the sub-node machine matching failure message, taking a decoded SPTS from the main node machine, and repeating the steps a to b; and when the main node machine obtains the successful matching information of all the sub-node machines, generating a frame display information in the main node machine, and sending the frame display information to all the sub-node machines through the cluster network in a multicast mode.
And 5: and all the child node machines carry out format conversion on the successfully matched PTS through the display module and send the successfully matched PTS into a display screen for displaying according to the frame display message.
The distributed spliced large-screen video stream cluster synchronous display system based on the PTS of the embodiment utilizes the digital image sequence characteristics of the video stream and a video stream cluster synchronous mechanism designed based on the PTS (time stamp), and a multicast receiving module, a TS stream unpacking module, a video decoding module, a synchronous control module and a display module in the system form a set of complete video stream synchronous display directly executable scheme, thereby effectively realizing the synchronous display of the video stream, improving the display effect of the distributed spliced large screen and being not limited by the splicing scale.
The above embodiments are specific examples of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A PTS-based distributed spliced large-screen video stream cluster synchronous display system is characterized by comprising: a multicast receiving module, a TS stream unpacking module, a video decoding module, a synchronous control module and a display module,
the multicast receiving module operates in the main node machine and each sub-node machine of the system independently and is used for receiving multicast data;
the TS stream unpacking module operates in the main node machine and each sub-node machine of the system independently and is used for unpacking the video stream ES from the composite signal stream TS and splicing the video stream into a frame of video data to be input into the video decoding module;
the video decoding module operates in the main node machine and each sub-node machine of the system independently and is used for decoding one frame of video data spliced by video streams to obtain a time stamp PTS of the video streams;
the synchronous control module is used for controlling the synchronous operation of the sub-node machine and the main node machine;
the display module runs in each sub-node machine of the system and is used for converting the format of the time stamp PTS of the decoded video stream and sending the decoded video stream to a display screen for displaying according to the frame display information.
2. The PTS-based distributed tiled large-screen video stream clustered synchronized display system of claim 1, wherein:
the multicast receiving module is a buffer area with a fixed size.
3. The PTS-based distributed tiled large-screen video stream clustered synchronized display system of claim 1, wherein:
the TS stream depacketizing module determines a frame of video data according to a payload _ unit _ start _ indicator flag in a TS stream header.
4. The PTS-based distributed tiled large-screen video stream clustered synchronized display system of claim 1, wherein:
the video decoding module adopts an open-source audio and video coding and decoding program to perform video decoding.
5. The PTS-based distributed tiled large-screen video stream clustered synchronized display system of claim 1, wherein:
after decoding, a video decoding module in the master node machine obtains a time stamp PTS of a video stream, and the PTS is recorded as an SPTS;
a video decoding module in the child node machine decodes the video stream to obtain a time stamp PTS of the video stream, and the time stamp PTS is recorded as a CPTS;
the synchronous control method operated in the synchronous control module comprises the following steps:
step a, decoding the SPTS obtained in the main node machine, sending the SPTS to a cluster network in a multicast mode, and entering a message waiting state;
b, after the sub-node machine receives the SPTS multicast data through the multicast receiving module, searching CPTS equal to the SPTS multicast data from the sub-node machine in a traversal mode, if the search is successful, sending a matching success message to the main node machine through the cluster network, otherwise, sending a matching failure message;
step c, when the main node machine acquires the sub-node machine matching failure message, taking a decoded SPTS from the main node machine, and repeating the steps a to b; and when the main node machine obtains the successful matching information of all the sub-node machines, generating a frame display information in the main node machine, and sending the frame display information to all the sub-node machines through the cluster network in a multicast mode to complete video display.
6. The PTS-based distributed tiled large-screen video stream cluster synchronous display system according to any of claims 1 to 5, wherein: the system operates according to the following synchronous display method:
step 1: the sub-node machine and the main node machine respectively receive the composite signal stream TS transmitted in a multicast mode through a multicast receiving module;
step 2: after receiving the composite signal stream TS, the sub-node machine and the main node machine respectively unpack a video stream ES from the composite signal stream TS through a TS stream unpacking module, and splice the video streams into a frame of video data to be input into a video decoding module;
and step 3: video decoding modules in the sub-node machine and the main node machine respectively perform video decoding to obtain time stamps PTS of corresponding frequency streams;
and 4, step 4: the method comprises the steps that a synchronization control module is used for carrying out synchronization control on a sub-node machine and a main node machine, whether all the sub-node machines are successfully matched with a main node machine message or not is judged, when all the sub-node machines are successfully matched with the main node machine message, a frame display message is generated in the main node machine, and the frame display message is sent to all the sub-node machines through a cluster network in a multicast mode;
and 5: and all the child node machines carry out format conversion on the successfully matched PTS through the display module and send the successfully matched PTS into a display screen for synchronous display according to the frame display message.
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Application publication date: 20200828 |