CN110177293B - Synchronous multicast and video forwarding method and system - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 4
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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 or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream 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]
- H04N21/60—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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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a synchronous multicast and video forwarding method, which comprises the following steps: the data packet containing the video stream and the audio stream is distributed to a receiving end; a receiving end receives the data packet, acquires video frames and corresponding audio streams, and records the receiving time and the set playing time of each video frame; setting the set delay time after the receiving time as the playing time of the video frames, playing the video frames and the corresponding audio streams at the playing time, monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, and if not, adopting a preset fine-tuning strategy to adjust the playing time of the current video frame and the playing time of the subsequent M video frames. The invention can enable a plurality of players under the same network to synchronously play the video programs at the same time, reduce the playing delay and the synchronous error and achieve the effect of synchronous lip sound playing; aiming at the video playing asynchronization caused by factors such as abnormal analysis and the like, a fine adjustment strategy is adopted for adjustment, so that synchronous playing is realized again.
Description
Technical Field
The invention relates to the technical field of video multicast, in particular to a method and a system for synchronous multicast and video forwarding.
Background
In terms of hardware, a video distributor can be used to connect the same video source playing device to a plurality of display devices through the distributor, and the video source playing device is mostly used for synchronous playing in a short distance; in terms of software, a common method is that video source devices send out videos in a network multicast mode, and then multicast stream receiving devices receive multicast data and perform combined playing, so that the method is suitable for synchronous playing of devices in different spaces in the same network, but in such usage, due to differences in video resolution performance of each video source device, problems such as network delay and large synchronization error (which may exceed 3 seconds) are easily caused.
Disclosure of Invention
The invention aims to provide a synchronous multicast and video forwarding method and a system, which can ensure that a plurality of players in the same network can synchronously play video programs at the same time, reduce playing delay and synchronous errors and achieve the effect of synchronous lip sound playing; aiming at the video playing asynchronization caused by factors such as abnormal analysis and the like, a fine adjustment strategy is adopted for adjustment, so that synchronous playing is realized again.
To achieve the above object, with reference to fig. 1, the present invention provides a method for synchronous multicast and video forwarding, where the method includes:
s1: and analyzing and packaging the video file to be played, converting the video file into a data packet containing a video stream and an audio stream, and issuing the data packet to each receiving end in a network multicast mode.
S2: and receiving the data packet by adopting a receiving end, analyzing the data packet, executing audio and video decoding control to acquire the video frames to be played and the corresponding audio streams, and recording the receiving time and the set playing time of each video frame.
S3: setting the set delay time after the receiving time as the playing time of the video frame, playing the video frame and the corresponding audio stream at the playing time, and
and monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, if not, adopting a preset fine-tuning strategy to adjust the playing time of the current video frame and the playing time of the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer greater than or equal to 0.
Based on the synchronous multicast and video forwarding method, the invention also provides a synchronous multicast and video forwarding system, which comprises a data source end and a plurality of receiving ends which are connected through the same network.
The data source end is used for analyzing and packaging the video file to be played, converting the video file into a data packet containing video streams and audio streams, and issuing the data packet to each receiving end in a network multicast mode.
The receiving end comprises the following modules:
(1) and the module is used for receiving the data packet, analyzing the data packet, executing audio and video decoding control to acquire the video frames to be played and the corresponding audio streams, and recording the receiving time and the set playing time of each video frame.
(2) And the module is used for setting the set delay time after the receiving time as the playing time of the video frame and playing the video frame and the corresponding audio stream at the playing time.
(3) And the module is used for monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, and if not, adopting a preset fine-tuning strategy to adjust the playing time lengths of the current video frame and the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer more than or equal to 0.
The method provided by the invention has no limitation on the types of the devices specifically adopted by the data source end and the data receiving end, and for example, a commonly used hardware terminal playing box in the prior art can be adopted, and a specially customized hardware terminal playing box can also be adopted.
And the data source end analyzes and packages the video file to be played, converts the video file into a video stream and an audio stream, and releases the video stream and the audio stream in a network multicast mode. After receiving the data, the receiving terminals need to perform data packet analysis and audio/video decoding control for a certain time, and then inform all the receiving terminals to start playing video pictures at the same time according to a preset playing control strategy.
In the case of transmitting a multicast packet in a network, the receiving end in the same network must receive the stream information at the same time. However, due to different performances of the receiving terminals, the time required for analyzing and playing the video may be different, which causes the playing time of the video frames of different receiving terminals to be inconsistent and the synchronization error of different receiving terminals to be large.
The preset playing control strategy mentioned in the invention means that the receiving end receives a certain frame of information as the starting time point, and plays the frame of information after a same relative time, thus ensuring that all the receiving ends can play the video completely and synchronously.
In addition, in order to avoid the phenomenon that the video frame playing of one receiving end is delayed, synchronous errors occur and even frame skipping playing occurs due to network fluctuation, abnormal analysis and other factors, the invention also provides a fine adjustment strategy for adjusting the phenomenon to enable the phenomenon to realize synchronous multicast again after a plurality of frames, and specifically, whether the actual playing time and the set playing time of each video frame are consistent or not is monitored in real time, if not, the preset fine adjustment strategy is adopted to adjust the playing time of the current video frame and the playing time of the following M video frames, so that the playing time of the M +1 video frame is the same as the set playing time, and M is an integer which is more than or equal to 0.
Compared with the prior art, the technical scheme of the invention has the following remarkable beneficial effects:
1) and informing all receiving ends to start playing the video pictures at the same time according to a preset playing control strategy so as to realize synchronous multicast.
2) And adjusting the video playing asynchronization caused by abnormal factors by adopting a fine adjustment strategy, and adjusting the playing time lengths of the current video frame and the subsequent M video frames one by one under the condition that human eyes cannot check so that the playing time of the (M + 1) th video frame is the same as the set playing time thereof, thereby realizing the synchronous multicast again.
3) And determining the value of the set delay time according to the actual requirement so as to realize different delay playing effects of the video.
4) And determining the adjustment step difference time length according to the actual requirement so as to balance the viewing effect and adjust the total time length.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of the synchronous multicast and video forwarding method of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
With reference to fig. 1, the present invention provides a method for synchronous multicast and video forwarding, where the method includes:
s1: and analyzing and packaging the video file to be played, converting the video file into a data packet containing a video stream and an audio stream, and issuing the data packet to each receiving end in a network multicast mode.
S2: and receiving the data packet by adopting a receiving end, analyzing the data packet, executing audio and video decoding control to acquire the video frames to be played and the corresponding audio streams, and recording the receiving time and the set playing time of each video frame. Preferably, the set playing time is calculated according to the number of frames per second of the video stream data. Assuming that a certain video stream data is 25 frames/second, one frame data is played for 40 ms.
S3: setting the set delay time after the receiving time as the playing time of the video frame, playing the video frame and the corresponding audio stream at the playing time, and
and monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, if not, adopting a preset fine-tuning strategy to adjust the playing time of the current video frame and the playing time of the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer greater than or equal to 0.
And transmitting the multicast packet in the same network, and receiving the stream information by a receiving end at the same time. Although the time required for analyzing and playing the video may be different due to different performances of the receiving ends, the invention proposes that the receiving ends can play the video after a same relative time by taking a certain frame of information received by the receiving ends as an initial time point, so as to ensure that all the receiving ends can play the video completely and synchronously.
For example, after receiving data, a receiving end needs to split and analyze the received data packet, find a video frame to be played, and then perform an audio/video decoding process, which may have a certain deviation due to the difference in performance of the receiving end, and if the decoding is directly analyzed and completed, the playing is started, and it is certain that a certain asynchronous condition occurs. However, by setting a set delay time, assuming that the set delay time is 1000 ms, the receiving end starts playing a frame of data 1000 ms after receiving the frame of data. All receiving ends receive data at the same time and have the same set delay time, and all receiving ends play the same data information at the same time, so that the synchronization of video playing is ensured.
The set delay time can be adjusted according to actual requirements, if the video needs to be played synchronously with a short delay, 1000 milliseconds can be shortened, preferably, the value of the set delay time needs to refer to the time for analyzing and decoding by the receiving end, if the delay time is too short, the data packet is not analyzed completely, the data packet cannot be played or is played wrongly, therefore, the set delay time is more than or equal to the longest video analysis time, and the video frame of each receiving end can be analyzed and completed.
If the parsing decoding time is too long, and a certain frame cannot be displayed, frame skipping playing may occur (video discontinuity may occur from the phenomenon of video playing). The present invention sets a fine-tuning strategy for this problem.
The preset fine-tuning strategy comprises the following steps:
s31: acquiring the actual playing time X of the video frameiCalculating the actual playing time XiAnd setting a play time SiIs detected for a time period deltat.
S32: calculating to obtain the adjustment step difference duration delta h of the current video frame and the subsequent M video framesjWherein, in the step (A),
s33: the adjusted playing time t is calculated according to the following formulaj：
tj＝Tj-Δhj
Wherein, TjIs the set play duration for j video frames.
S34: and taking the adjusted playing time length as the playing time length of the current video frame and the subsequent M video frames to play the video.
The adjustment step length Δ hjThe present invention takes two ways as examples to illustrate the working principle of the foregoing fine tuning strategy.
First mode
Adjusting the step length Δ hjIs a fixed value, e.g. the adjustment step duration Δ hjLess than or equal to 5 milliseconds.
Assuming that a certain video stream data is 25 frames/second, one frame data is played for 40 ms. If a video frame appears 10 milliseconds later before the completion of playback, the playback interval is only 30 milliseconds from the next video frame. When such a situation is detected, a fine-tuning strategy is adopted for adjustment, specifically:
the video frame delayed by 10 milliseconds is forcibly switched to the next video frame after being played for 35 milliseconds, and the next video frame is switched to the third video frame after being played for 35 milliseconds, so that the third video frame is played synchronously with other players. In addition, these two video frames are only played for 35 ms, with only a 5 ms difference, either synchronous or delayed, that is indistinguishable by the human eye.
Second mode
Adjusting the step length Δ hjThe adjustment step length Δ h of each video frame can be calculated by combining the preset maximum adjustment total length threshold value, the current video frame and the set playing length of the following M video frames as a dynamic valuej。
For the same differenceDuration Δ T, adjustment step duration Δ hjThe smaller the difference between the actual playing time length of each frame and the set playing time length is, the smaller the influence on the picture watching experience of the user at the receiving end is, but the larger the total adjusting time length is, the asynchronous playing can be kept for a longer time. Instead, the step length Δ h is adjustedjThe larger the adjustment total time length is, the smaller the adjustment total time length is, the synchronous playing can be adjusted in a shorter time, but the larger the influence on the picture watching experience of the user at the receiving end is, the larger the difference value between the actual playing time length of each frame and the set playing time length is.
In practical application, the proper adjustment step length Δ h can be selected according to the actual playing requirementjFor example, if the requirement for synchronous playing is high in a certain situation, the step length Δ h is adjustedjThe value of (a) is as large as possible.
But adjusting the step length deltahjIs not an unlimited value that is greater or lesser, and in some instances, Δ hjThe following conditions are satisfied:
wherein, P is a preset maximum adjustment total duration threshold, and Δ H is a maximum adjustment step difference duration.
Setting the maximum adjustment total duration threshold and the maximum adjustment step duration to the adjustment step duration DeltahjThe value of (a) is defined.
According to the fine adjustment strategy, a video can be accurately and synchronously played on players in different spaces in the same network, and the maximum synchronization error tested at present can be controlled within 200 milliseconds (200 milliseconds is imperceptible to human eyes).
Based on the synchronous multicast and video forwarding method, the invention also provides a synchronous multicast and video forwarding system, which comprises a data source end and a plurality of receiving ends which are connected through the same network.
The data source end is used for analyzing and packaging the video file to be played, converting the video file into a data packet containing video streams and audio streams, and issuing the data packet to each receiving end in a network multicast mode.
The receiving end comprises the following modules:
(1) and the module is used for receiving the data packet, analyzing the data packet, executing audio and video decoding control to acquire the video frames to be played and the corresponding audio streams, and recording the receiving time and the set playing time of each video frame.
(2) And the module is used for setting the set delay time after the receiving time as the playing time of the video frame and playing the video frame and the corresponding audio stream at the playing time.
(3) And the module is used for monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, and if not, adopting a preset fine-tuning strategy to adjust the playing time lengths of the current video frame and the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer more than or equal to 0.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (4)
1. A method for synchronized multicast and video forwarding, the method comprising:
s1: analyzing and packaging a video file to be played, converting the video file into a data packet containing a video stream and an audio stream, and issuing the data packet to each receiving end in a network multicast mode;
s2: receiving the data packet by adopting a receiving end, analyzing the data packet, executing audio and video decoding control to obtain video frames to be played and corresponding audio streams, and recording the receiving time and the set playing time of each video frame;
s3: setting the set delay time after the receiving time as the playing time of the video frame, playing the video frame and the corresponding audio stream at the playing time, and
monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, if not, adopting a preset fine-tuning strategy to adjust the playing time of the current video frame and the playing time of the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer greater than or equal to 0;
the preset fine-tuning strategy comprises the following steps:
s31: acquiring the actual playing time X of the video frameiCalculating the actual playing time XiAnd setting a play time SiThe difference duration Δ T;
s32: calculating to obtain the adjustment step difference duration delta h of the current video frame and the subsequent M video framesjWherein, in the step (A),
s33: the adjusted playing time t is calculated according to the following formulaj：
tj＝Tj-Δhj
Wherein, TjIs the set playing duration of j video frames;
s34: the adjusted playing time length is used as the playing time length of the current video frame and the subsequent M video frames to play the video;
the set delay time is 1000 milliseconds;
the adjustment step length Δ hjLess than or equal to 5 milliseconds;
in step S32, the preset maximum total adjustment duration threshold and the set playing duration of the current video frame and the subsequent M video frames are combined to calculate the adjustment step duration Δ h of each video framej；
The Δ hjThe following conditions are satisfied:
wherein, P is a preset maximum adjustment total duration threshold, and Δ H is a maximum adjustment step difference duration.
2. The method according to claim 1, wherein the set playing duration is calculated according to the number of frames per second of the video stream data.
3. The method according to claim 1, wherein the set delay time is equal to or greater than a longest video parsing time.
4. A synchronous multicast and video forwarding system based on the method of claim 1, wherein the system comprises a data source end and a plurality of receiving ends connected through the same network;
the data source end is used for analyzing and packaging a video file to be played, converting the video file into a data packet containing a video stream and an audio stream, and issuing the data packet to each receiving end in a network multicast mode;
the receiving end comprises the following modules:
a module for receiving the data packet, analyzing the data packet, executing audio/video decoding control to obtain the video frames to be played and the corresponding audio stream, and recording the receiving time of each video frame and the set playing time;
a module for setting the set delay time after the receiving time as the playing time of the video frame, and playing the video frame and the corresponding audio stream at the playing time;
and the module is used for monitoring whether the actual playing time of each video frame is consistent with the set playing time in real time, and if not, adopting a preset fine-tuning strategy to adjust the playing time lengths of the current video frame and the subsequent M video frames so as to enable the playing time of the (M + 1) th video frame to be the same as the set playing time of the M +1 th video frame, wherein M is an integer more than or equal to 0.
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| CN115314744A (en) * | 2022-07-01 | 2022-11-08 | 深圳市丝路蓝创意展示有限公司 | Synchronous playing method, device, equipment and storage medium |
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