CN112153445A - Synchronous decoding and playing method and system for distributed video display system - Google Patents
Synchronous decoding and playing method and system for distributed video display system Download PDFInfo
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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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
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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]
- H04N21/40—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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
Abstract
The invention discloses a synchronous decoding and playing method and a system of a distributed video display system, wherein the synchronous decoding and playing method comprises a TX node and an RX node, the TX node is used for video coding and pushing video streams to a network, and the RX node is used for video decoding and receiving the video streams from the network; feeding back the node delay of the RX node to the TX node, wherein the node delay comprises network delay and processing delay, and the processing delay is specifically the delay from decoding to playing; calculating an average delay according to the node delay fed back by each RX node, and sending the average delay to the RX node; determining a processing strategy of the current RX node according to the node delay of the current RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction; and repeating the steps. The invention realizes the synchronization of the video decoding and playing of each decoding node under the condition of not increasing the integral delay of the system, can flexibly expand the specification of the system and reduce the hardware cost.
Description
Technical Field
The invention relates to the technical field of video transmission and processing in the field of computers, in particular to a synchronous decoding and playing method and system for a distributed video display system.
Background
The overall performance of a centralized video display system is completely limited by the performance of central nodes such as video splicers and streaming media distribution servers. The centralized video splicer has the disadvantages of high price, complex structure, limited number of supported video paths, high processing load of a central node and poor expandability. The reliability of the centralized video display system mainly depends on the central node, and once the central node fails, the whole system cannot work normally.
The distributed video display system solves the performance limitation of a video splicer and a streaming media distribution server in the original centralized video display system, can flexibly expand the specification of the system and reduce the hardware cost. Each node works independently, the defect that the whole system cannot work normally when the center nodes such as the video splicer and the like break down can be avoided, only the broken-down nodes need to be replaced, and the reliability of the whole system is improved.
However, the decoding and playing synchronization of each decoding node in the distributed video display system has the following problems:
(1) under the influence of network conditions, the delay of video stream data transmitted through the network to reach each decoding node of the distributed video display system is uneven, and synchronization is required.
(2) The processing load and speed of each decoding node are different, the time consumption from decoding to playing is different, and synchronization is needed.
(3) The overall delay of the distributed video display system is reduced as much as possible while ensuring the synchronization effect.
Firstly, main decoding nodes need to be appointed and synchronous information is transmitted among the decoding nodes, so that the network load and the processing workload of the main decoding nodes are increased; and secondly, the decoding nodes with low delay need to be cached to wait for the decoding nodes with large delay, which finally causes the overall delay of all the decoding nodes of the distributed video display system to be gradually increased, and influences the real-time playing effect.
Disclosure of Invention
The technical problem to be solved by the invention is how to ensure the pace consistency during multi-screen splicing display by independently processing video data by each decoding node in a distributed video display system and realize synchronous decoding and playing of each decoding node, and the invention aims to provide a synchronous decoding and playing method and a synchronous decoding and playing system for a distributed video display system and solve the problem of synchronous decoding and playing of each decoding node in the distributed video display system.
The invention is realized by the following technical scheme:
a synchronous decoding and playing method of a distributed video display system defines a TX node and an RX node, wherein the TX node is used for video coding and pushing a video stream to a network, and the RX node is used for video decoding and receiving the video stream from the network; step S1: feeding back a node delay of the RX node to the TX node, wherein the node delay comprises a network delay and a processing delay, and the processing delay is specifically a process delay from decoding to playing; step S2: the TX node calculates an average delay according to the node delay fed back by each RX node and sends the average delay to the RX node; step S3: the RX node determines a processing strategy of the current RX node according to the node delay of the current RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction; steps S1-S3 are repeated.
The distributed video display system is influenced by the network condition, the delay of video stream data transmitted to each decoding node of the distributed video display system through the network is different, the processing load and speed of each decoding node are different, and the time consumption from decoding to playing is different, so that synchronization is needed. The overall delay of the distributed video display system is reduced as much as possible while ensuring the synchronization effect. The method of the invention feeds back the network delay and the delay from the decoding to the playing process of the node to the TX node by the RX node, the TX node manages uniformly, calculates the average delay, the TX node sends the average delay to the RX node, the RX node determines the operation of accelerating the processing speed or slowing the processing speed of the current RX node according to the comparison of the average delay and the node delay of the node, thereby realizing the effective synchronization of each receiving and transmitting node of the distributed video display system.
Further, the step S3 includes: comparing the node delay of the current RX node with the average delay received by the current RX node, and evaluating whether the processing speed of the current RX node is faster or slower than the average speed of the whole system by considering the influence of the video frame number and the frame rate; if the processing speed of the current RX node is higher, slowing down the processing speed of the current RX node; and if the processing speed of the current RX node is slower, accelerating the processing speed of the current RX node.
Further, the slowing down the processing speed of the current RX node includes buffering the video.
Further, the accelerating the processing speed of the current RX node includes selectively discarding non-key frames or all frames through a time bottom line.
Further, the time base line is dynamically sliding, and the time base line is:
RxTimestamp–RxDelay–N*(1000/fps)，
wherein N represents fps/10, that is, how many video frames are included in a time of about 100ms, RxTimestamp is the current time of a local clock corrected by a unified clock source, RxDelay is the node delay of a current RX node, fps is a video frame rate, and the fps is a unit of millisecond.
Further, the video stream sent by the TX node to the RX node includes video data control information, where the video data control information includes a local clock timestamp TxTimestamp, an average processing frame number AverageFrameNo and an average delay field AverageDelay within a statistical period; A. if the TxTimestamp in the video data control information is smaller than the time bottom line, directly discarding the video frame; B. and if the TxTimestamp in the video data control information is greater than the time bottom line, delivering the key video frame to a rear-end module for decoding according to the type of the video frame.
Further, the TX node and the RX node both use a unified clock source.
In another implementation manner of the present invention, a synchronous decoding and playing system for a distributed video display system includes a TX node and multiple RX nodes, where the TX node is used for video encoding and pushing a video stream to a network, the RX nodes are used for video decoding and receiving a video stream from the network, each RX node feeds back a node delay of the local node to the TX node, where the node delay includes a network delay and a processing delay, and the processing delay is specifically a process delay from decoding to playing; the TX node calculates the average delay according to the node delay fed back by each RX node and sends the average delay to each RX node; and the RX node determines a processing strategy of the current RX node according to the node delay of the RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction.
Further, the RX node compares the node delay of the node with the average delay received by the node, and evaluates whether the processing speed of the node is faster or slower than the average speed of the whole system, taking into account the influence of the frame number and the frame rate of the video frame; if the processing speed of the current RX node is higher, the processing speed of the current RX node is reduced; and if the processing speed of the current RX node is slower, the processing speed of the current RX node is accelerated.
Further, the slowing down the processing speed of the node includes caching a video; the accelerating the processing speed of the node comprises selectively discarding non-key frames or all frames.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method can realize the synchronization of the video decoding and playing of each decoding node under the condition of not increasing the integral delay of the system, ensure the playing synchronization effect as much as possible and reduce the processing speed difference among the decoding nodes when various sudden abnormal conditions of the network and the node load occur, and can also quickly converge and restore to normal when the conditions of the network and the node load are restored to normal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the method 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 further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
A node for video encoding and pushing a video stream to a network in the distributed video display system is called a TX node, and a node for receiving the video stream from the network and decoding and playing the video stream is called an RX node.
This embodiment 1 is a method for synchronously decoding and playing a distributed video display system, as shown in fig. 1, which mainly includes the following steps:
(1) the TX node and the RX node both adopt a unified clock source.
(2) The RX node feeds back the network delay and the processing (decoding playout) delay together as a node delay to the TX node.
(3) The RX node estimates whether the processing speed of the RX node is higher or lower than the average speed of the RX node according to the comparison between the node delay and the average delay of the RX node and by considering the influence of the frame number and the frame rate of the video frame, and then adopts different strategies to process.
(4) When the RX node processes the video faster, the video is properly buffered to slow down the processing speed.
(5) When the RX node is slow in processing, non-key frames or all frames are selectively discarded through a time bottom line, the decoding processing load is reduced, and the purpose of reducing the decoding playing delay is achieved.
(6) The TX node summarizes the node delay fed back and announced by each RX node, calculates the average delay, and sends the average delay to each RX node along with video stream data.
The TX node carries a local clock timestamp TxTimestamp, an average processing frame number AverageFrameNo and an average delay field AverageDelay in a statistical period in the header of the data packet control information for transmitting the video stream, both in milliseconds.
1. The TX node transmits video data for the first time:
when the TX node sends video stream data through a network, a current timestamp is marked on each frame of code stream according to a local clock corrected by a unified clock source, and a TxTimestamp field in the header of data packet control information is filled. The AverageDelay field is filled in as 0 before the response announcement of the RX node is received.
2. And (3) processing after the RX node receives the video data:
(1) estimating the delay of the node:
after receiving video stream data, the rx node calculates local network delay RxNetworkDelay according to TxTimestamp and AverageFrameNo in the data packet:
RxNetworkDelay＝(RxTimestamp–TxTimestamp)-(RxFrameNo–AverageFrameNo)*(1000/fps)
wherein: the RxTimestamp is the current time of the local clock corrected by the unified clock source, the RxFrameNo is the frame number of the currently processed video frame, and the fps is the video frame rate, which are all in milliseconds.
And B, the RX node calculates the processing delay RxDecodeDelay of the decoding and displaying process in the past one statistical period (for example, 2 seconds is taken as one statistical period), wherein the RxDecodeDelay is taken by milliseconds, the RxDecodeDelay can be obtained by calculating the time consumption of the decoding and playing rendering process for software decoding, and can be obtained by chip statistical information such as the length of a queue to be decoded and the processing time consumption for hardware decoding.
And the RX node calculates the node delay according to the network delay RxNetworkdelay and the processing delay RxDecodeedelay: RxDelay ═ rxbetworkdelay + rxdecodelay.
(2) Informing the TX node of the delay of this node:
and the RX node sends the node delay RxDelay and the currently processed video frame number RxFrameNo in a statistical period to the TX node.
(3) Adjusting a decoding and playing processing strategy:
according to the delay RxDelay and AverageDelay fields of the node, the RX node can estimate whether the processing of the node in the whole system is faster or slower.
Rxdelay ═ AverageDelay: the RX node delay is smaller than the average delay of the system, the processing is quicker, the received video data is cached for AverageDelay-RxDelay milliseconds and then delivered to a back-end module for decoding and playing according to the normal processing flow, the synchronization is ensured, and the delay between the RX node and the video source end is ensured to be as small as possible.
RxDelay > AverageDelay: the RX node delay is larger than the system average delay, the processing is slow, and the process enters an accelerated catching-up process.
(4) "accelerated chase procedure" of RX node:
after the RX node enters the accelerated catch-up procedure, it determines whether to deliver the received video data to the back-end decoding module for further processing through a dynamically sliding time bottom line. The time base line is: RxTimestamp-RxDelay-N (1000/fps), N is typically fps/10, i.e. how many video frames are contained in a time of around 100 ms.
A. If the TxTimestamp in the video data control information is smaller than the bottom line, the video frame with larger delay is considered to be directly discarded without subsequent processing.
B. If the TxTimestamp in the video data control information is larger than the time bottom line, only the key video frame is delivered to the rear-end module for decoding according to the video frame type, so that the bad user experience such as screen omission is avoided in a frame rate reducing mode, and other 'faster' RX nodes are caught up as much as possible.
If the RX node is slow due to a large processing delay rxcodedelay and enters an "accelerated catch-up procedure", with the decrease of the amount of video data decoded by the back-end module and the load decrease, the rxcodedelay can be significantly decreased in the following several statistical cycles, and when RxDelay is decreased to be lower than AverageDelay, the accelerated catch-up procedure can be exited and normal decoding can be resumed.
If the RX node enters the accelerated catching-up process due to the slow RX node caused by the large network delay RxNetworkDelay, the RX node catches up other 'faster' nodes as much as possible by selectively dropping frames, and after the network returns to normal, the RX node significantly decreases with the network delay RxNetworkDelay, and when RxDelay drops below AverageDelay, the RX node can exit the accelerated catching-up process and return to normal decoding.
3. The TX node estimates the average network delay:
the TX node receives delay notice from each RX node periodically and continuously, receives delay notice from M RX nodes in a statistical period, and calculates the average delay according to the following formula:
AverageFrameNo ═ min (each RxFrameNo)
AverageDelay＝∑[RxDelay–(RxFrameNo-AverageFrameNo)*(1000/fps)]/M
The RX node repeatedly executes the steps (1) to (4) in the step 2, and the TX node repeatedly executes the step 3 to dynamically adjust and control the speed of decoding playing.
Example 2
This embodiment 2 is a synchronous decoding and playing system for a distributed video display system using the method described in embodiment 1, and includes a TX node and multiple RX nodes, where the TX node is used for video encoding and pushing video streams to a network, the RX nodes are used for video decoding and receiving video streams from the network, each RX node feeds back a node delay of its own node to the TX node, where the node delay includes a network delay and a processing delay, and the processing delay is specifically a process delay from decoding to playing; the TX node calculates the average delay according to the node delay fed back by each RX node and sends the average delay to each RX node; and the RX node determines the processing strategy of the current RX node according to the node delay of the RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction. The RX node compares the node delay of the node with the average delay received by the node, and evaluates whether the processing speed of the node is higher or lower than the average speed of the whole system by considering the influence of the video frame number and the frame rate; if the processing speed of the current RX node is higher, the processing speed of the current RX node is reduced; and if the processing speed of the current RX node is slower, the processing speed of the current RX node is accelerated. Slowing down the processing speed of the node comprises caching a video; speeding up the processing speed of the node includes selectively dropping non-key frames or all frames.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A synchronous decoding and playing method for a distributed video display system is characterized in that a TX node and an RX node are defined, wherein the TX node is used for video coding and pushing a video stream to a network, and the RX node is used for video decoding and receiving the video stream from the network;
step S1: feeding back a node delay of the RX node to the TX node, wherein the node delay comprises a network delay and a processing delay, and the processing delay is specifically a process delay from decoding to playing;
step S2: the TX node calculates an average delay according to the node delay fed back by each RX node and sends the average delay to the RX node;
step S3: the RX node determines a processing strategy of the current RX node according to the node delay of the current RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction;
steps S1-S3 are repeated.
2. The method for synchronously decoding and playing back a distributed video display system according to claim 1, wherein said step S3 comprises: comparing the node delay of the current RX node with the average delay received by the current RX node, and evaluating whether the processing speed of the current RX node is faster or slower than the average speed of the whole system by considering the influence of the video frame number and the frame rate;
if the processing speed of the current RX node is higher, slowing down the processing speed of the current RX node;
and if the processing speed of the current RX node is slower, accelerating the processing speed of the current RX node.
3. The method for synchronous decoding and playing of a distributed video display system as claimed in claim 2, wherein slowing down the processing speed of the current RX node comprises buffering video.
4. The method for synchronous decoding and playing of a distributed video display system according to claim 2, wherein the speeding up of the processing of the current RX node comprises selectively dropping non-key frames or all frames through a timeline.
5. The synchronous decoding and playing method for the distributed video display system according to claim 4, wherein the time bottom line is dynamically sliding, and the time bottom line is:
RxTimestamp–RxDelay–N*(1000/fps)，
wherein N represents fps/10, that is, how many video frames are included in a time of about 100ms, RxTimestamp is the current time of a local clock corrected by a unified clock source, RxDelay is the node delay of a current RX node, fps is a video frame rate, and the fps is a unit of millisecond.
6. The synchronous decoding and playing method for the distributed video display system according to claim 5, wherein the video stream sent by the TX node to the RX node includes video data control information, and the video data control information includes a local clock timestamp TxTimestamp, an average processing frame number AverageFrameNo and an average delay field AverageDelay within a statistical period;
A. if the TxTimestamp in the video data control information is smaller than the time bottom line, directly discarding the video frame;
B. and if the TxTimestamp in the video data control information is greater than the time bottom line, delivering the key video frame to a rear-end module for decoding according to the type of the video frame.
7. The synchronous decoding and playing method for the distributed video display system according to claim 1, wherein the TX node and the RX node both use a unified clock source.
8. A synchronous decoding and playing system of a distributed video display system is characterized by comprising a TX node and a plurality of RX nodes, wherein the TX node is used for video coding and video stream pushing to a network, the RX nodes are used for video decoding and video stream receiving from the network, each RX node feeds back the node delay of the RX node to the TX node, the node delay comprises a network delay and a processing delay, and the processing delay is a process delay from decoding to playing; the TX node calculates the average delay according to the node delay fed back by each RX node and sends the average delay to each RX node; and the RX node determines a processing strategy of the current RX node according to the node delay of the RX node and the received average delay, wherein the processing strategy comprises the processing speed acceleration or the processing speed reduction.
9. The system of claim 8, wherein the RX node compares the node delay of the local node with the average delay received by the local node, and evaluates whether the processing speed of the local node is faster or slower than the average speed of the entire system, taking into account the influence of the frame number and the frame rate of the video frame;
if the processing speed of the current RX node is higher, the processing speed of the current RX node is reduced;
and if the processing speed of the current RX node is slower, the processing speed of the current RX node is accelerated.
10. The system for synchronously decoding and playing back a distributed video display system as claimed in claim 9, wherein said slowing down the processing speed of the local node comprises caching the video; the accelerating the processing speed of the node comprises selectively discarding non-key frames or all frames.
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