CN103079088A - Multi-screen video preprocessing and synchronous broadcasting method and system - Google Patents
Multi-screen video preprocessing and synchronous broadcasting method and system Download PDFInfo
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Abstract
The invention provides a multi-screen video preprocessing and synchronous broadcasting method and system. The method comprises the steps: respectively storing video data in local storage space of video broadcasting nodes; and converting the video data into YUV (Luma and Chroma) image sequences respectively by the video broadcasting nodes. The YUV image sequence is arranged by frames in a one-to-one manner, the video can be synchronously corrected to each frame when the video data is broadcast, thereby being more precise in video synchronization compared with the existing video broadcasting progress time; in addition, the video data is stored in the local storage space corresponding to the video broadcasting nodes, so that the image mislocation, tearing, color breaking and the like caused by the low data transmission efficiency can also be effectively avoided, and a better video synchronization effect can be realized.
Description
Technical field
The present invention relates to multi-screen splicing demonstration field, particularly relate to a kind of multi-screen video pre-filtering and synchronous broadcast method and system.
Background technology
Play in the system of ultrahigh resolution video in design multi-screen splicing display system at present, a kind of video synchronization method commonly used is to send video file to each video playback node by video server, then the playing progress rate time of video is sent to each broadcast nodes from server in beginning during displaying video, adjusts the local playing progress rate of calibration according to the video playback progress time of receiving again by each broadcast nodes.
Perhaps through further optimizing, can make video server send the video playback progress time according to predefined time interval circulation, allow broadcast nodes constantly update the time reference of playing progress rate, thereby realize the lasting correction to the video playback progress.
Yet, when these traditional approachs are applied in the ultrahigh resolution video playback, because the video data capacity is huge, when transmitting video file, can be subject to the limit bandwidth of data transmission channel, cause efficiency of transmission low; In addition, the bearing calibration that sends the video playback progress time based on server exists the support that high frame-rate video is play not enough, can't guarantee the accurate synchronization that the high frame-rate video of multihead display ultrahigh resolution is play.Through after the long-time play operation, the display effect defectives such as the image synchronization error that accumulates can directly cause at the multi-display stitching image image offset occuring, tears, color tomography.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of prior art, a kind of multi-screen video pre-filtering and synchronous broadcast method and system are provided, can reach good audio video synchronization effect.
Purpose of the present invention is achieved through the following technical solutions:
A kind of multi-screen video pre-filtering and synchronous broadcast method is characterized in that, comprise the steps:
Respectively with Video Data Storage in the local memory space of each video playback node;
Each described video playback node converts described video data to the YUV image sequence respectively.
A kind of multi-screen video pre-filtering and synchronous playing system is characterized in that, comprise a plurality of node units, and described node unit comprises respectively:
Memory module is used for the local stored video data at the video playback node;
Modular converter is used for converting described video data to the YUV image sequence.
According to the scheme of the invention described above, with after Video Data Storage is in the memory space of the correspondence of each video playback node, each video playback node can convert this video data to the YUV image sequence respectively respectively; Then when the needs playing video data, just can play-over the YUV image sequence after the conversion, and this YUV image sequence is frame frame arrangement, then when video data is play, just can be accurate to each frame to audio video synchronization, to carry out audio video synchronization by the time more accurate with respect to existing, simultaneously, with Video Data Storage in the local memory space of the correspondence of each video playback node, also effectively avoided by the low image offset that causes of data transmission efficiency, torn, color tomography etc., realized better audio video synchronization effect.
Description of drawings
Fig. 1 is the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method embodiment;
Fig. 2 is the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method the first embodiment;
Fig. 3 is the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method the second embodiment;
Fig. 4 is the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method the 3rd embodiment;
Fig. 5 is the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method the 4th embodiment;
Fig. 6 is the structural representation of multi-screen video pre-filtering of the present invention and synchronous playing system embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further elaborated, but implementation of the present invention is not limited to this.
Referring to shown in Figure 1, the schematic flow sheet of multi-screen video pre-filtering of the present invention and synchronous broadcast method embodiment.As shown in Figure 1, multi-screen video pre-filtering and the synchronous broadcast method in the present embodiment comprises the steps:
Step S101: respectively with Video Data Storage in the local memory space of each video playback node;
Step S102: each described video playback node converts described video data to respectively YUV (a kind of colour coding method that YUV is adopted by the eurovision system) image sequence, wherein, convert video data to the YUV image sequence and can adopt existing mode, do not repeat them here.
Above-mentioned, before playing video data, in advance with Video Data Storage in the local memory space of each video playback node, avoided use high-performance video server, simultaneously initialization procedure does not need to transmit the mass data of video of required broadcast to each broadcast nodes from video server, greatly reduce the bandwidth of data transmission channel is relied on, saved the cost of system constructing, also effectively avoided by the low image offset that causes of data transmission efficiency, tear, color tomography etc.;
In addition, each video playback node converts video data to the YVU image sequence, then when video data is play, just can be accurate to each frame to audio video synchronization, to carry out audio video synchronization by the time (can comprise a lot of frame data in the unit interval) more accurate with respect to existing, can realize better audio video synchronization effect.
As previously mentioned, after converting video data to the YVU image sequence, can obtain better audio video synchronization effect, below, in embodiment one, specifically set forth a kind of concrete implementation that realizes multi-screen audio video synchronization broadcast mode.
Embodiment one
As shown in Figure 2, the present embodiment carries out the multi-screen audio video synchronization to be play on the basis of above-described embodiment, and its specific implementation process can comprise the steps:
Step S201: master synchronizer sends play instruction to each described video playback node, described play instruction comprises the video playback configuration information, and begins benchmark synchronization frame sequence count with the play frame rate in the described video playback configuration information simultaneously at the described play instruction of transmission;
Described video playback configuration information is used for each video playback node is carried out the location calibration that audio video synchronization is play; Concrete, described video playback configuration information can comprise: the video playback frame per second, video is initial or stop play instruction, audio video synchronization sequence frame interval etc.;
Step S202: each described video playback node is play the frame sequence count value according to described play frame rate and local video respectively and is play described YUV image sequence when receiving described play instruction;
Step S203: each described video playback node sends the request of benchmark synchronization frame sequence counter value according to the audio video synchronization sequence frame interval in the described video playback configuration information to described master synchronizer;
Step S204: described master synchronizer responds the request of described benchmark synchronization frame sequence counter value, respectively current benchmark synchronization frame sequence counter value is sent to each described video playback node;
Step S205: each described video playback node is according to the benchmark synchronization frame sequence counter value correcting local video playback frame sequence count value that receives, and wherein, correcting mode can adopt existing implementation, does not repeat them here.
Accordingly, according to the scheme in the present embodiment, each video playback node can be with benchmark synchronization frame sequence counter value as synchronous base, playing the frame sequence count value by this benchmark synchronization frame sequence count value calibration local video can be accurate to take a frame video data as base synchronously, this video playback node and master synchronizer adopt the sequence of frames of video counting as the mode of the base of approaching synchronously, replace in the prior art commonly used take the unit interval as base's mode, cooperation with the sequence of frames of video counting interval as audio video synchronization correct operation interval, more be adapted at the precise synchronization video in the application scenario that high frame-rate video plays.
Embodiment two
In addition, at present audio video synchronization player method commonly used is to adopt video data is directly decoded demonstration according to the playing progress rate of configuration information, can't control the display frame zone, and video data of the present invention converts the YVU image sequence to, can realize the control to the display frame zone, referring to shown in Figure 3, concrete implementation can comprise step:
Step S301: master synchronizer sends play instruction to each video playback node, and described play instruction comprises video cut lengths coordinate data;
Described video cut lengths coordinate data can comprise: each apex coordinate of the video pictures of corresponding video playback demonstration that node is born, picture are at the corresponding vertex coordinate of on-screen display (osd) area, and this video cut lengths coordinate data can be calculated according to the corresponding relation of each broadcast nodes and screen display unit and generate;
Step S302: each video playback node shows the picture image content of counterpart at the display screen unit of correspondence according to these video cut lengths data when receiving described video cut lengths data.
In the present embodiment, mode according to described video cut lengths data display video image content, broadcasting pictures resolution that can flexible configuration video playback node, and can realize the control to the video pictures viewing area, and then can realize that in the occasion that the ultrahigh resolution audio video synchronization is play abnormity shows.
Above-described embodiment one is to comprise that in play instruction the video playback configuration information describes as example, above-described embodiment two is to comprise that in play instruction video cut lengths coordinate data as example describes, also can be to include simultaneously cut lengths coordinate data and video playback configuration information in play instruction.The below comprises simultaneously that take play instruction cut lengths coordinate data and video playback configuration information describe as example.
Embodiment three
As shown in Figure 4, in this embodiment, concrete processing procedure includes:
Step 4201: master synchronizer sends play instruction to each described video playback node, described play instruction comprises video playback configuration information and video cut lengths coordinate data, and begins benchmark synchronization frame sequence count with the play frame rate in the described video playback configuration information simultaneously at the described play instruction of transmission;
Described video playback configuration information is used for each video playback node is carried out the location calibration that audio video synchronization is play; Concrete, described video playback configuration information can comprise: the video playback frame per second, video is initial or stop play instruction, audio video synchronization sequence frame interval etc.;
Described video cut lengths coordinate data can comprise: each apex coordinate of the video pictures of corresponding video playback demonstration that node is born, picture are at the corresponding vertex coordinate of on-screen display (osd) area, and this video cut lengths coordinate data can be calculated according to the corresponding relation of each broadcast nodes and display screen unit and generate;
Step 402: each video playback node is receiving described play instruction constantly, play the frame sequence count value according to described play frame rate and local video respectively and play described YUV image sequence, and show respectively the picture image content of counterpart according to described video cut lengths data at the display screen unit of correspondence;
Step 403～step 405 is corresponding identical with step 203～step 205, does not repeat them here.
According to the scheme in the present embodiment, realized the simultaneous display of video data, also realized special-shaped demonstration.
Embodiment four
In order further to improve approaching synchronously of broadcast nodes and master synchronizer, as a kind of better execution mode, the present embodiment can also comprise the steps: on the basis of above-described embodiment one or embodiment three
Step 501: the first time of reception when each described video playback nodes records receives benchmark synchronization frame sequence counter value, and send the benchmark confirmation that comprises this first time of reception to described master synchronizer;
Step 503: described master synchronizer records the second time of reception when receiving described benchmark confirmation, and this second time of reception is sent to each described video playback node;
Step 503: the second difference that the benchmark synchronization frame sequence counter value after each described video playback node is delayed time through the counteracting data transmission channel according to the first difference acquisition of described the second time of reception and described the first time of reception respectively and local video are play the frame sequence count value;
Step 504: according to described the second difference described local play sequence count value is proofreaied and correct, concrete trimming process can adopt existing mode to realize, does not repeat them here.
Because in the present embodiment, offset the data transmission channel time-delay, so that the second difference of benchmark synchronization frame sequence counter value and local video broadcast frame sequence count value is more accurate, can further improve approaching synchronously of each broadcast nodes and master synchronizer.
The data communication channel that adopts among above each embodiment can include but are not limited to Ethernet, fiber optic network, universal asynchronous serial, spi bus, I2C bus etc.; The video that the video playback node is play can comprise but not limit and derives from local storage, the video flowing of telecommunication network transmission or the video server video source of appointment.
According to multi-screen video pre-filtering and the synchronous broadcast method of the invention described above, the present invention also provides a kind of multi-screen video pre-filtering and synchronous playing system, below is elaborated with regard to the concrete example of multi-screen video pre-filtering of the present invention and synchronous playing system.The structural representation of a preferable examples of multi-screen video pre-filtering of the present invention and synchronous playing system has been shown among Fig. 6, in Fig. 6, has only provided the sub-structure of a video playback node 602, other video playback nodes also comprise these sub-structures.According to different Considerations, when specific implementation multi-screen video pre-filtering of the present invention and synchronous playing system, can comprise whole shown in Fig. 6, also can only comprise the wherein part shown in Fig. 6, below just be elaborated for wherein several multi-screen video pre-filterings and the concrete example of synchronous playing system.
Concrete example 1
In this concrete example, can be each video playback node 602 that comprises among Fig. 6, each video playback node 602 includes memory module 6021, modular converter 6022 respectively, wherein:
Accordingly, according to the scheme of this concrete example, memory module 6021 is behind the local stored video data of video playback node, and modular converter 6022 can convert this video data to the YUV image sequence.Owing to having realized Video Data Storage in the local memory space of each video playback node, avoided use high-performance video server, the simultaneity factor initialization procedure does not need to transmit the mass data of displaying video to each broadcast nodes from video server, the bandwidth that greatly reduces data transmission channel relies on, saved the cost of system constructing, also effectively avoided by the low image offset that causes of data transmission efficiency, tear, color tomography etc.; Owing to converting video data to the YVU image sequence, then when video data is play, just can be accurate to each frame to audio video synchronization, be undertaken more accurately synchronously by the time (can comprise a lot of frame data in the unit interval) with respect to existing, can realize better audio video synchronization effect.
Concrete example 2
In this concrete example, on the basis of above-mentioned concrete example 1, can also comprise master synchronizer 601, master synchronizer 601 comprises reference count module 6011, Synchronization Control communication module 6012, in addition, each video playback node 602 also comprises respectively synchronous communication module 6023, playing module 6024, node counts module 6025, correction module 6026, wherein:
Synchronization Control communication module 6011 is used for sending play instruction to each described video playback node, described play instruction comprises the video playback configuration information, also be used for responding the request of described benchmark synchronization frame sequence counter value, respectively current benchmark synchronization frame sequence counter value is sent to each described video playback node, wherein, the video playback configuration information can comprise: the video playback frame per second, video is initial or stop play instruction, audio video synchronization sequence frame interval etc.;
Node counts module 6025 is used for beginning local video and plays the frame sequence counting when synchronous communication module 6023 receives described play instruction;
Playing module 6024 is used for when synchronous communication module 6023 receives described play instruction, plays the frame sequence count value according to the local video of described play frame rate and node counts module 6025 and plays described YUV image sequence;
Accordingly, according to the scheme in this concrete example, each video playback node can be with benchmark synchronization frame sequence counter value as synchronous base, playing the frame sequence count value by this benchmark synchronization frame sequence count value calibration local video can be accurate to take a frame video data as base synchronously, this video playback node and master synchronizer adopt the sequence of frames of video counting as the mode of the base of approaching synchronously, replace in the prior art commonly used take the unit interval as base's mode, cooperation with the sequence of frames of video counting interval as audio video synchronization correct operation interval, more be adapted at the precise synchronization video in the application scenario that high frame-rate video plays.
Concrete example 3
On the basis of concrete example 2, each video playback node can also comprise respectively display control module 6027, and described play instruction can also comprise video cut lengths data; Described video cut lengths coordinate data can comprise: each apex coordinate of the video pictures of corresponding video playback demonstration that node is born, picture are at the corresponding vertex coordinate of on-screen display (osd) area, and this video cut lengths coordinate data can be calculated according to the corresponding relation of each broadcast nodes and screen display unit and generate; Display control module 6027 is used for showing at the display screen unit of correspondence according to the video cut lengths data of correspondence the picture image of counterpart.
In this concrete example, mode according to described video cut lengths data display video image content, broadcasting pictures resolution that can flexible configuration video playback node, and can realize the control to the video pictures viewing area, and then can realize that in the occasion that the ultrahigh resolution audio video synchronization is play abnormity shows.
Concrete example 4
In order further to improve approaching synchronously of broadcast nodes and master synchronizer, as a kind of better execution mode:
Synchronization Control communication module 6012 can also be used for the second time of reception that record receives described benchmark confirmation, and described the second time of reception is sent to each described video playback node;
Owing in this concrete example, having offset the data transmission channel time-delay, so that the second difference of benchmark synchronization frame sequence counter value and local video broadcast frame sequence count value is more accurate, can further improve approaching synchronously of each broadcast nodes and master synchronizer.
The data communication channel that adopts in above each concrete example can include but are not limited to Ethernet, fiber optic network, universal asynchronous serial, spi bus, I2C bus etc.; The video that the video playback node is play can comprise but not limit and derives from local storage, the video flowing of telecommunication network transmission or the video server video source of appointment.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a multi-screen video pre-filtering and synchronous broadcast method is characterized in that, comprise the steps:
Respectively with Video Data Storage in the local memory space of each video playback node;
Each described video playback node converts described video data to the YUV image sequence respectively.
2. multi-screen video pre-filtering according to claim 1 and synchronous broadcast method is characterized in that, also comprise step:
Master synchronizer sends play instruction to each described video playback node, and described play instruction comprises the video playback configuration information, and begins benchmark synchronization frame sequence count with the play frame rate in the described video playback configuration information simultaneously at the described play instruction of transmission;
Each described video playback node is play the frame sequence count value according to described play frame rate and local video respectively and is play described YUV image sequence when receiving described play instruction;
Each described video playback node sends the request of benchmark synchronization frame sequence counter value according to the audio video synchronization sequence frame interval in the described video playback configuration information to described master synchronizer;
Described master synchronizer responds the request of described benchmark synchronization frame sequence counter value, respectively current benchmark synchronization frame sequence counter value is sent to each described video playback node;
Each described video playback node is according to the benchmark synchronization frame sequence counter value correcting local video playback frame sequence count value that receives.
3. multi-screen video pre-filtering according to claim 1 and 2 and synchronous broadcast method is characterized in that, also comprise step:
When playing described YUV image sequence, master synchronizer sends play instruction to each video playback node, and described play instruction comprises video cut lengths data;
Each video playback node shows respectively the picture image of counterpart at the display screen unit of correspondence according to the video cut lengths data of correspondence when receiving described play instruction.
4. multi-screen video pre-filtering according to claim 2 and synchronous broadcast method is characterized in that, also comprise step:
The first time of reception when each described video playback nodes records receives benchmark synchronization frame sequence counter value, and send the benchmark confirmation that comprises this first time of reception to described master synchronizer;
Described master synchronizer records the second time of reception when receiving described benchmark confirmation, and this second time of reception is sent to each described video playback node;
The second difference that benchmark synchronization frame sequence counter value after each described video playback node is delayed time through the counteracting data transmission channel according to the first difference acquisition of described the second time of reception and described the first time of reception respectively and local video are play the frame sequence count value;
According to described the second difference described local play sequence count value is proofreaied and correct.
5. according to claim 2 or 4 described multi-screen video pre-filtering and synchronous broadcast methods, it is characterized in that, the communication port between described master synchronizer and each the described video playback node comprises Ethernet, fiber optic network, universal asynchronous serial, spi bus, I2C bus.
6. multi-screen video pre-filtering according to claim 1 and synchronous broadcast method is characterized in that, the source of described video data comprises local storage, the video flowing of telecommunication network transmission, predetermined video server video source.
7. a multi-screen video pre-filtering and synchronous playing system is characterized in that, comprise a plurality of video playback nodes, described video playback node comprises respectively:
Memory module is used for the local stored video data at the video playback node;
Modular converter is used for converting described video data to the YUV image sequence.
8. multi-screen video pre-filtering according to claim 7 and synchronous playing system, it is characterized in that, also comprise master synchronizer, described master synchronizer comprises reference count module and Synchronization Control communication module, and described video playback node also comprises respectively synchronous communication module, node counts module, playing module, correction module;
Described Synchronization Control communication module is used for sending play instruction to each described video playback node, described play instruction comprises the video playback configuration information, also be used for responding the request of described benchmark synchronization frame sequence counter value, respectively current benchmark synchronization frame sequence counter value be sent to each described video playback node;
Described reference count module is used for sending described play instruction in described Synchronization Control communication module and begins benchmark synchronization frame sequence count with the play frame rate of described video playback configuration information simultaneously;
Described synchronous communication module is used for receiving described play instruction, also be used for sending the request of benchmark synchronization frame sequence counter value according to the audio video synchronization sequence frame interval of described video playback configuration information to described master synchronizer, also be used for receiving described benchmark synchronization frame sequence counter value;
Described node counts module is used for beginning local video and plays the frame sequence counting when described synchronous communication module receives described play instruction;
Described playing module is used for when described synchronous communication module receives described play instruction, plays the frame sequence count value according to described play frame rate and local video and plays described YUV image sequence;
Described correction module is used for according to the benchmark synchronization frame sequence counter value correcting local video playback frame sequence count value that receives.
9. multi-screen video pre-filtering according to claim 8 and synchronous playing system is characterized in that, described video playback node also comprises respectively display control module, and described play instruction also comprises video cut lengths data;
Described display control module is used for showing at the display screen unit of correspondence according to the video cut lengths data of correspondence the picture image of counterpart.
10. it is characterized in that according to claim 8 or 9 described multi-screen video pre-filtering and synchronous playing systems:
Described synchronous communication module also is used for recording the first time of reception when receiving benchmark synchronization frame sequence counter value, and sends the benchmark confirmation that comprises the first time of reception to described master synchronizer;
Described Synchronization Control communication module also is used for the second time of reception that record receives described benchmark confirmation, and described the second time of reception is sent to each described video playback node;
Described correction module obtains through offsetting the second difference of benchmark synchronization frame sequence counter value and local video broadcast frame sequence count value after the data transmission channel time-delay according to the first difference of described the second time of reception and described the first time of reception, and according to this second difference described local play sequence count value is proofreaied and correct.
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