CN107979777A - A kind of live TV stream seamless handover method and device - Google Patents
A kind of live TV stream seamless handover method and device Download PDFInfo
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- CN107979777A CN107979777A CN201610951766.7A CN201610951766A CN107979777A CN 107979777 A CN107979777 A CN 107979777A CN 201610951766 A CN201610951766 A CN 201610951766A CN 107979777 A CN107979777 A CN 107979777A
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- 230000002159 abnormal effect Effects 0.000 abstract 1
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Classifications
-
- 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
-
- 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
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
-
- 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
- H04N21/440263—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 by altering the spatial resolution, e.g. for displaying on a connected PDA
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
The present invention provides a kind of live TV stream seamless handover method and device, it is related to technical field of video processing, wherein, the present invention proposes a kind of in the case where keeping main thread normally to export current video stream, establishing does not influence the new sub-line journey of main thread, by reading new video stream in advance in new sub-line journey and obtaining key frame, main thread is after sub-line journey is completed to the acquisition of key frame, the key frame stored with sub-line journey replaces current output image frame, live TV stream seamless switching is completed with this, present invention obtains in the case where not influencing main thread and normally exporting current video stream, pre-process new video stream, avoid the technique effect of the abnormal conditions such as the interruption of outputting video streams and blank screen in handoff procedure.
Description
Technical field
The present invention relates to technical field of video processing, more particularly to a kind of live TV stream seamless handover method and device.
Background technology
In the live fields of IPTV, it is sometimes desirable to cut according to user's operation or switching demand between different signal source
Change.Existing switching method is first to close current demand signal source to open new signal source again, then starts coding output to new signal source.
Existing method has defect, due to needing first to close current demand signal source, then on the basis of current demand signal source is closed
Access new signal source simultaneously encodes output, and of short duration cutout situation occurs in this process, while is closing current demand signal source and cutting
Entering between new signal source has of short duration gap, easily produces interim card situation, and the above problem can be directly resulted in handoff procedure
There is the situation of cutout and black field, and influence the smooth output of signal.
The content of the invention
For it is above-mentioned in switching signal source, it is necessary to first close current demand signal source cuts new signal source again, cause output to be believed
The problem of number cutout, black field and smoothness reduce, the present invention provides a kind of live TV stream seamless handover method and device.
Technical solution provided by the invention is as follows：
A kind of live TV stream seamless handover method, includes the following steps：
S1 establishes new video stream and reads sub-line journey, and new video stream picture frame is read in circulation, and determines whether image key
Frame；If image key frame, then image key frame is preserved；
S2 main threads image key frame described in step S1 replaces current output image frame；
S3 main threads export new video stream, complete live TV stream switching.
Further, the image key frame described in step S1 of main thread described in step S2 replaces current output image frame
Method includes：
S21 main threads judge whether current output image frame is every IDR frame (first intracoded frame) one by one；If current output
Picture frame is every IDR frame, then the image key frame described in step S1 replaces the every IDR frame currently exported.
Further, further included in step s3 before main thread output new video stream：
S31 main threads carry out Image Adjusting to new video stream.
Further, described image method of adjustment includes：
Adjust resolution ratio, or adjustment Presentation Time Stamp and decoded time stamp, or adjustment resolution ratio and adjustment Presentation Time Stamp
With decoded time stamp.
Further, Image Adjusting, detailed process are carried out to new video stream using the method for adjustment resolution ratio in main thread
For：
Judge whether new video stream resolution ratio is consistent with original video stream resolution ratio；
If new video stream and original video stream resolution ratio are inconsistent, filter is reset, and use filter adjustment new video flow point
Resolution.
Further, figure is carried out to new video stream using the method for adjustment Presentation Time Stamp and decoded time stamp in main thread
As adjustment, detailed process is：
Judge the difference of Presentation Time Stamp or decoded time stamp between new video stream present frame and original video stream last frame
Whether preset difference value is reached；
If reaching preset difference value, the timestamp offset of new video stream present frame is reset, when ensureing the display of output stream
Between stamp and decoded time stamp continuously increase.
A kind of live TV stream seamless switching device, including：Sub-line journey processing module and main thread processing module；
Wherein, the sub-line journey processing module, reads sub-line journey, new video flow graph is read in circulation for creating new video stream
As frame, and determine whether image key frame；If image key frame, then image key frame is preserved；
The main thread processing module, is connected with the sub-line journey processing module, and the main thread processing module is by described in
The image key frame of sub-line journey processing module storage replaces current output image frame.
Further, the main thread processing module includes：Frame recognition unit and switch unit；
Wherein, the frame recognition unit, for judging whether current output frame is IDR frames one by one；
The switch unit, is connected with the frame recognition unit, and the switch unit is judged based on the frame recognition unit
As a result, the image key frame of sub-line journey processing module storage is replaced into current output image frame.
Further, the main thread processing module further includes：Adjust module；
Wherein, the adjustment module, is connected with the main thread processing module, it is described adjustment module to the main thread at
Manage the new video stream after module switching and carry out Image Adjusting.
Further, the adjustment module includes：Resolution adjustment unit and/or timestamp adjustment unit；
Wherein, the resolution adjustment unit, is connected with the main thread processing module, and the resolution adjustment unit is sentenced
Whether disconnected new video stream resolution ratio and original video stream resolution ratio are consistent；If new video stream and original video stream resolution ratio are inconsistent,
Adjust new video stream resolution ratio；
The timestamp adjustment unit, is connected with the main thread processing module, and the timestamp adjustment unit judges new
Whether the difference of Presentation Time Stamp or decoded time stamp reaches default poor between video flowing present frame and original video stream last frame
Value；If reaching preset difference value, the timestamp offset of new video stream present frame is reset so that the display time of outputting video streams
Stamp and decoded time stamp continuously increase.
Live TV stream seamless handover method provided by the invention and system, can bring following beneficial effect：
In the present invention, by establishing new sub-line journey, preferentially new video stream is handled by sub-line journey, using sub-line journey
Auxiliary switching, can carry out video flowing switching in the case where not influencing main thread and normally exporting.
In the present invention, obtained in advance by newly-built sub-line journey and preserve the key frame in new video stream, it is also possible that
The whole handoff procedure time is reduced.
In the present invention, select to start to switch in the every IDR frame position of original video stream, and with the key frame pair in new video stream
The every IDR frame of original video stream is replaced so that is not in Huaping phenomenon in handoff procedure, is ensured smooth output.
In the present invention, filter is initialized by resetting, resolution ratio is carried out to new video stream with the filter after replacement
Adjustment so that the present invention supports the live TV stream switching of different resolution.
In the present invention, by adjusting Presentation Time Stamp come adjust original video stream last frame and new video stream output frame it
Between PTS/DTS timestamp offsets, ensure handoff procedure in occur without interim card.
Brief description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, to above-mentioned characteristic, technical characteristic,
Advantage and its implementation are further described.
Fig. 1 is the flow chart of live TV stream seamless handover method of the present invention；
Fig. 2 is a specific implementation illustration of live TV stream seamless handover method of the present invention；
Fig. 3 is another specific implementation illustration of live TV stream seamless handover method of the present invention；
Fig. 4 is the block diagram of live TV stream seamless switching device of the present invention；
Fig. 5 is a specific implementation illustration of live TV stream seamless switching device of the present invention.
Drawing reference numeral explanation：
100- sub-line journey processing modules, 200- main thread processing modules, 201- frame recognition units, 202- switch units,
300- adjusts module, 301- resolution adjustment units, 302- timestamp adjustment units.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
It is as depicted in figs. 1 and 2 a kind of live TV stream seamless handover method provided by the invention, when user or some situations
When needing to switch over current video stream, we establish a new sub-line journey outside main thread, and the foundation of sub-line journey is not
Influence the main thread normally output to current video stream.In sub-line journey, new video stream media information is read out, when reading
When key frame, which is preserved, and prompts the work of main thread handover preparation to complete.Main thread is exporting
While video flowing, it can monitor whether to need Switch Video stream, the switch prompting based on sub-line journey, main thread will be protected in sub-line journey
The key frame deposited replaces current output image frame, completes switching.
It is contemplated that replaced to handoff procedure there may be flower screen exception and to ensure that signal smoothing is exported with key frame
When changing current output image frame, employ main thread and first inquire about whether current output frame is every IDR frame, if so, just being replaced with key frame
The every IDR frame is changed, output smoothness is ensured with this.
A kind of live TV stream seamless handover method provided by the invention is illustrated in figure 3, on the basis of Fig. 1 and Fig. 2, increase
New video stream is exported and carries out Image Adjusting.
Due to us it cannot be guaranteed that the resolution ratio of new video stream is every time identical with original video stream resolution ratio, so occurring
When resolution ratio is different, video flowing can be switched and made a big impact.
So we are adjusted the resolution ratio of new video stream using filter, when main thread finds the resolution of new video stream
When rate is different from the resolution ratio of original video stream, filter can be reset, and resolution ratio tune is carried out to new video stream with the filter after resetting
It is whole.
Meanwhile the Presentation Time Stamp or decoded time stamp there are original video stream last frame in handoff procedure are (following right
" Presentation Time Stamp or decoded time stamp " is referred to as " PTS/DTS ") it is larger with the difference of the PTS/DTS of the first frame of new video stream,
Larger PTS/DTS gaps can make occur the situation that discontinuous and smoothness reduces during output.
So when main thread finds that the PTS/DTS of the PTS/DTS and the first frame of new video stream of original video stream last frame are poor
When being worth excessive, Presentation Time Stamp can be adjusted, to reduce difference, to ensure to occur without the situation of discontinuous and smoothness reduction.
A kind of live TV stream seamless switching device provided by the invention is illustrated in figure 4, including：Sub-line journey processing module 100
And main thread processing module 200；Wherein, main thread processing module 200 includes frame recognition unit 201 and switch unit 202.
When needing to carry out live TV stream switching, sub-line journey processing module 100 establishes a sub-line outside main thread
Journey, which does not influence output of the main thread to current video stream, and new video stream is first read out with sub-line journey, and
Find and store key frame.
Main thread processing module 200, based on the prompting of sub-line journey processing module 100, is replaced current with the key frame of storage
Output image frame.
When replacing current output image frame with the key frame of storage, we work as main thread using frame recognition unit 201
Preceding output frame is judged, judges whether current output frame is every IDR frame, only when current output frame is every IDR frame, just by switching
Unit 202 switches over video flowing.
A kind of live TV stream seamless switching device provided by the invention is illustrated in figure 5, on the basis of Fig. 3, further includes tune
Mould preparation block 300；Wherein adjustment module 300 includes：Resolution adjustment unit 301 and/or timestamp adjustment unit 302.
In live TV stream handoff procedure, there are many unpredictable situations, such as：Original video stream is differentiated with new video stream
Rate is different, and the PTS/DTS of original video stream last frame and the PTS/DTS differences of the first frame of new video stream are excessive etc..
Resolution adjustment unit 301, can judge whether original video stream is different from new video stream resolution ratio, if it is different, then
Filter is reset, the resolution ratio of new video stream is adjusted by the filter of replacement.
Timestamp adjustment unit 302, can judge the PTS/DTS and the first frame of new video stream of original video stream last frame
Whether PTS/DTS differences are excessive, if excessive, the difference is reduced by adjusting Presentation Time Stamp.
Claims (10)
1. a kind of live TV stream seamless handover method, it is characterised in that include the following steps：
S1 establishes new video stream and reads sub-line journey, and new video stream picture frame is read in circulation, and determines whether image key frame；If
It is image key frame, then preserves image key frame；
S2 main threads image key frame described in step S1 replaces current output image frame；
S3 main threads export new video stream, complete live TV stream switching.
2. live TV stream seamless handover method as claimed in claim 1, it is characterised in that main thread step S1 described in step S2
Described in image key frame replace current output image frame method include：
S21 main threads judge whether current output image frame is every IDR frame one by one；If current output image frame is every IDR frame, with step
Image key frame replaces the every IDR frame currently exported described in rapid S1.
3. live TV stream seamless handover method as claimed in claim 1 or 2, it is characterised in that main thread output is new in step s3
Further included before video flowing：
S31 main threads carry out Image Adjusting to new video stream.
4. live TV stream seamless handover method as claimed in claim 3, it is characterised in that described image method of adjustment includes：
Adjust resolution ratio, or adjustment Presentation Time Stamp and decoded time stamp, or adjustment resolution ratio and adjustment Presentation Time Stamp and solution
Code timestamp.
5. live TV stream seamless handover method as claimed in claim 4, it is characterised in that using the side of adjustment resolution ratio in main thread
Method carries out Image Adjusting to new video stream, and detailed process is：
Judge whether new video stream resolution ratio is consistent with original video stream resolution ratio；
If new video stream and original video stream resolution ratio are inconsistent, filter is reset, and use filter adjustment new video stream resolution ratio.
6. live TV stream seamless handover method as claimed in claim 4, it is characterised in that using adjustment Presentation Time Stamp in main thread
Image Adjusting is carried out to new video stream with the method for decoded time stamp, detailed process is：
Judge between new video stream present frame and original video stream last frame whether is the difference of Presentation Time Stamp or decoded time stamp
Reach preset difference value；
If reaching preset difference value, the timestamp offset of new video stream present frame is reset so that during the display of outputting video streams
Between stamp and decoded time stamp continuously increase.
A kind of 7. live TV stream seamless switching device, it is characterised in that including：Sub-line journey processing module and main thread processing mould
Block；
Wherein, the sub-line journey processing module, reads sub-line journey, new video stream image is read in circulation for creating new video stream
Frame, and determine whether image key frame；If image key frame, then image key frame is preserved；
The main thread processing module, is connected with the sub-line journey processing module, and the main thread processing module is by the sub-line
The image key frame of journey processing module storage replaces current output image frame.
8. live TV stream seamless switching device as claimed in claim 7, it is characterised in that the main thread processing module includes：Frame
Recognition unit and switch unit；
Wherein, the frame recognition unit, for judging whether current output frame is every IDR frame one by one；
The switch unit, is connected with the frame recognition unit, and the switch unit is based on the frame recognition unit judging result,
The image key frame of sub-line journey processing module storage is replaced into current output image frame.
9. the live TV stream seamless switching device as described in claim 7 or 8, it is characterised in that the main thread processing module is also wrapped
Include：Adjust module；
Wherein, the adjustment module, is connected with the main thread processing module, and the adjustment module handles mould to the main thread
New video stream after block switching carries out Image Adjusting.
10. live TV stream seamless switching device as claimed in claim 9, it is characterised in that the adjustment module includes：Resolution ratio tune
Whole unit and/or timestamp adjustment unit；
Wherein, the resolution adjustment unit, is connected with the main thread processing module, and the resolution adjustment unit judges are new
Whether video flowing resolution ratio is consistent with original video stream resolution ratio；If new video stream and original video stream resolution ratio are inconsistent, adjust
New video stream resolution ratio；
The timestamp adjustment unit, is connected with the main thread processing module, and the timestamp adjustment unit judges new video
Whether the difference of Presentation Time Stamp or decoded time stamp reaches preset difference value between stream present frame and original video stream last frame；If
Reach preset difference value, then reset new video stream present frame timestamp offset so that the Presentation Time Stamp of outputting video streams and
Decoded time stamp continuously increases.
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| CN201610951766.7A CN107979777A (en) | 2016-10-25 | 2016-10-25 | A kind of live TV stream seamless handover method and device |
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| CN201610951766.7A CN107979777A (en) | 2016-10-25 | 2016-10-25 | A kind of live TV stream seamless handover method and device |
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