CN104410807A - Method and device for synchronously replaying multi-channel video - Google Patents
Method and device for synchronously replaying multi-channel video Download PDFInfo
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Abstract
The invention is applicable to the technical field of surveillance, and provides a method and a device for synchronously replaying multi-channel video. The method for synchronously replaying the multi-channel video includes acquiring a plurality of timestamps of the multi-channel video which is currently played; selecting one channel of video from the multi-channel video with the multiple timestamps to be used as standard video; adjusting video frames of the multi-channel video according to a standard timestamp until the multi-channel video can be synchronously played. The timestamp of the standard video is the standard timestamp. The method and the device have the advantages that video frames of the multi-channel video are adjusted according to the standard timestamp until the multi-channel video can be synchronously played, accordingly, the problem of incapability of synchronously replaying multi-channel video due to the fact that search threads are jammed or the decoding speeds fail to keep pace with video frame rates in positioning procedures can be solved, the multi-channel video can be simultaneously replayed at the same time, multi-channel video synchronous replaying threads can be reduced, and the multi-channel video synchronous replaying speeds can be increased.
Description
Technical field
The invention belongs in monitoring technique field, particularly relate to a kind of multi-channel video synchronized playback method and device.
Background technology
DVR (DigitalVideoRecorder, DVR), i.e. digital video recorder, adopt hard disc recording, have image/voice recorded a video for a long time, record, the function of telemonitoring and control.Along with the rapid raising of the network bandwidth, computer process ability and memory capacity and the appearance of the various usable video information processing technology, video monitoring enters the cybertimes of total digitalization, is namely usually said third generation video monitoring system.The features such as digital monitoring is directly perceived with it, convenient and abundant in content, are day by day subject to people's attention and pay close attention to.
But existing DVR supports multi-channel video capturing, the basis that in use, stamp carries out frame synchronization achieves the synchronized playback to multi-channel video, there is the major defect of two aspects in it, details are as follows:
First aspect, DVR carry out multi-channel video synchronously play time, need the video frame information of first Search and Orientation multi-channel video, its reason is, adopts the original frame of video Search and Orientation of DVR, needs to read frame of video in multi-channel video in the whole text, can the positional information of accurate positioning video frame, therefore, easily cause thread to block, occur multi-video-stream render asynchrony phenomenon.
Second aspect, DVR carry out multi-channel video synchronously play time, multi-channel video and audio mix are encoded, when carrying out decoding and playing thread, often because the decode rate of video does not catch up with video frame rate, cause can only playing one by one during video playback, therefore, multi-channel video synchronized playback cannot be carried out.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of multi-channel video synchronized playback method and device, be intended to solve multi-channel video when synchronized playback, because the blocking of Search and Orientation process thread or decode rate do not catch up with video frame rate, cause multi-channel video cannot realize the problem of synchronized playback.
The embodiment of the present invention is achieved in that a kind of multi-channel video synchronized playback method, comprising:
Obtain multiple timestamps of the multi-channel video of current broadcasting;
In multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
Stab according to the described standard time, adjust the frame of video of described multi-channel video, play described multi-channel video until synchronous.
Another object of the embodiment of the present invention is to provide multi-channel video synchronous playback means, comprising:
Timestamp acquisition module, for obtaining multiple timestamps of the multi-channel video of current broadcasting;
Module selected by label time stamp, and in multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
Synchronous processing module, for stabbing according to the described standard time, adjusts the frame of video of described multi-channel video, plays described multi-channel video until synchronous.
In the present embodiment, stab according to the standard time, the frame of video of adjustment multi-channel video, until synchronously play multi-channel video, avoid in position fixing process, because of search thread blocking or decode rate do not catch up with video frame rate, occur that multi-channel video can not the situation of synchronized playback, make the same time can simultaneously playback multi-channel video, thus both decreased the thread of multi-channel video synchronized playback, also improve the speed of multi-channel video synchronized playback.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the multi-channel video synchronized playback method that the embodiment of the present invention provides;
Fig. 2 is the realization flow figure of the multi-channel video synchronized playback method step S103 that the embodiment of the present invention provides;
Fig. 3 is the realization flow figure of the multi-channel video synchronized playback method decoding buffer memory that the embodiment of the present invention provides;
Fig. 4 is the first structured flowchart of the multi-channel video synchronous playback means that the embodiment of the present invention provides;
Fig. 5 is the second structure chart of the multi-channel video synchronous playback means that the embodiment of the present invention provides;
Fig. 6 is the 3rd structure chart of the multi-channel video synchronous playback means that the embodiment of the present invention provides;
Fig. 7 is the 4th structure chart of the multi-channel video synchronous playback means that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
embodiment one
With reference to the realization flow figure that figure 1, Fig. 1 is the multi-channel video synchronized playback method that the embodiment of the present invention provides, details are as follows:
In step S101, obtain multiple timestamps of the multi-channel video of current broadcasting;
In step s 102, in multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
In step s 103, stab according to the described standard time, adjust the frame of video of described multi-channel video, play described multi-channel video until synchronous.
Wherein, generate video recording APMB package in Video coding packing, described Video coding adopts compress technique, changed by the form of video, and compressed encoding can be MPEG and H.26X form.
Wherein, in multichannel video decoding thread, called by cycle for the treatment of frame by frame when decoder is play the decoding of video flowing, once circulate only complete a two field picture decoding, process, display; And controlled in the speed of service of circulation, decoding is play thread and will at full throttle be run, and therefore, must add and slow down circulation execution frequency to the pausing operation of thread, thus realize the control to playback rate.
In the present embodiment, stab according to the standard time, the frame of video of adjustment multi-channel video, until synchronously play multi-channel video, avoid in position fixing process, because of search thread blocking or decode rate do not catch up with video frame rate, occur that multi-channel video can not the situation of synchronized playback, make the same time can simultaneously playback multi-channel video, thus both decreased the thread of multi-channel video synchronized playback, also improve the speed of multi-channel video synchronized playback.
embodiment two
Multiple timestamps of the multi-channel video of current broadcasting are obtained in pre-configured concordance list.
In this example, multiple frame of video of the multi-channel video of the current broadcasting of extracting, described frame of video is key frame, by removing the in-frame encoding picture that image space redundant information carrys out compressed transmission data amount as far as possible, by the concordance list of the temporal information of described frame of video and offset address correspondence establishment every road video of described frame of video, read the information of every road concordance list, the specifying information in this road video can be obtained.
embodiment three
Extract the temporal information of frame of video in multi-channel video, according to described temporal information configuration index table.
Wherein, described video recording APMB package comprises video recording packet header information and multi-channel video; The information of frame of video concordance list comprises video frame time and the offset address of frame of video in multi-channel video.
In the present embodiment, the frame of video concordance list of the video recording APMB package of generation is added into video recording APMB package afterbody, namely be multi-channel video afterbody, the address of frame of video concordance list is added in video recording packet header information successively, the frame of video concordance list on each road is stored to this road video afterbody successively, being convenient to when playback Search and Orientation, time by reading video recording APMB package, navigating to rapidly frame of video concordance list, then obtain the specifying information in video recording bag by frame of video concordance list.
embodiment four
With reference to the realization flow figure that figure 2, Fig. 2 is the multi-channel video synchronized playback method step S103 that the embodiment of the present invention provides, details are as follows:
Stab according to the described standard time, in described multi-channel video, the frame of video of the video of adjustment except described normal video, play described multi-channel video until synchronous, be specially:
In step s 201, stab according to the described standard time, in described multi-channel video, judge whether the timestamp of the video beyond described normal video is greater than stamp of described standard time;
In step S202, when the timestamp of described video is greater than stamp of described standard time, then again export a upper frame of video, until the timestamp of described video stabs identical with the described standard time;
In step S203, when the timestamp of described video is less than stamp of described standard time, loses described video current frame data, obtain next frame of video, until the timestamp of video stabs identical with the described standard time.
Wherein, multi-channel video can be 4,6,9,12,16,32 or more multi-channel video, is preferably 4 road videos herein; Other 3 road videos stab with this standard time one by one and carry out contrast and process, if when the timestamp of certain road video is greater than standard time stamp, then again export the previous frame video data of this road video; If when the timestamp of certain road video is less than standard time stamp, then there is frame losing phenomenon, directly obtain the next frame video data of this road video, arrive adjustment timestamp and realize the synchronous of video data.
embodiment five
With reference to the decoding buffer memory realization flow figure that figure 3, Fig. 3 is the multi-channel video synchronized playback method that the embodiment of the present invention provides, details are as follows:
In step S301, according to decoder frame per second in multi-channel video and video stream frame rate difference comparsion, determine the display duration of decoding buffer memory;
In this example, arrange variable Toverflow to be expressed as " each frame shows total duration and exceeds the time difference that it applies total duration so far ", suppose that some time n-th frame is through suspending thread msleep (t) display, call clock () function obtain now after time tn thread continue to move to next frame when being ready to shown, then the n-th frame is with duration Tn=clock ()-tn+1 of display;
In step s 302, according to the display duration of decoding buffer memory, in adjustment multi-channel video, buffer memory decoding is until synchronous.
When the duration Tn of Video Decoder frame per second display is greater than the duration Tf of the every two field picture display of video stream frame rate, the value of Tn-Tf is added Toverflow, directly enters the display of n+1 frame;
In this example, the display duration of n frame has exceeded it and should show duration, because the n+1 frame decoding consumption too much time, so the duration difference of Tn-Tf is added Toverflow, realizes video fast forward form, directly enters the display of n+1 frame.
When the duration Tn of Video Decoder frame per second display is not more than the long Tf of duration of video stream frame rate every two field picture display, and the value of Tf-Tn is less than the current accumulative value of Toverflow, Toverflow is deducted the value of Tf-Tn, directly enters the display of n+1 frame;
In this example, make to realize falling back at the video play, reach the object of the rear simultaneous display of decoding.
When the duration Tn of Video Decoder frame per second display is not more than the duration Tf of the every two field picture display of video stream frame rate, and the value of Tf-Tn is not less than the current accumulative value of Toverflow, suspend the duration that thread msleep (t) suspends Tf-Tn-Toverflow, then empty Toverflow and enter.
In the present embodiment, when the display duration difference of Tf-Tn is not less than the current accumulative value of Toverflow, wherein, comprises the situation that Toverflow is zero, when having suspended Tf-Tn-Toverflow duration, emptying the accumulated value of Toverflow, enter the display of n+1 frame.
embodiment six
Fig. 4 is the first structured flowchart of the multi-channel video synchronous playback means that the embodiment of the present invention provides, and this multi-channel video synchronous playback means can run on server.For convenience of explanation, illustrate only part related to the present embodiment.
With reference to Fig. 4, this multi-channel video synchronous playback means, comprising:
Timestamp acquisition module 41, for obtaining multiple timestamps of the multi-channel video of current broadcasting;
Module 42 selected by label time stamp, and in multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
Synchronous processing module 43, for stabbing according to the described standard time, adjusts the frame of video of described multi-channel video, plays described multi-channel video until synchronous.
In a kind of implementation of the present embodiment, be the second structure chart of the multi-channel video synchronous playback means that the embodiment of the present invention provides with reference to Fig. 5, Fig. 5, in this multi-channel video synchronous playback means, described timestamp acquisition module 41 comprises:
Concordance list dispensing unit 411, extracts the temporal information of frame of video in multi-channel video, according to described temporal information configuration index table.
In this example, described concordance list comprises the offset address of video frame time information and frame of video, and described concordance list correspondence is kept at the afterbody of multi-channel video; The address of described concordance list is added into the head of multi-channel video, obtains multiple timestamps of the multi-channel video of current broadcasting according to the offset address of video frame time information and frame of video in described concordance list.
Timestamp acquiring unit 412, obtains multiple timestamps of the multi-channel video of current broadcasting in pre-configured concordance list
In this example, extract multiple video frame time information of the multi-channel video of current broadcasting, set up corresponding concordance list according to described multiple video frame time information, in described concordance list, obtain multiple timestamps of the multi-channel video of current broadcasting.
In a kind of implementation of the present embodiment, be the 3rd structure chart of the multi-channel video synchronous playback means that the embodiment of the present invention provides with reference to Fig. 6, Fig. 6, in this multi-channel video synchronous playback means, described synchronous processing module 43 comprises:
Synchronous processing unit 431, for stabbing according to the described standard time, in described multi-channel video, the frame of video of the video of adjustment except described normal video, plays described multi-channel video until synchronous.
In a kind of implementation of the present embodiment, be the 4th structure chart that the embodiment of the present invention provides multi-channel video synchronous playback means with reference to Fig. 7, Fig. 7, in this multi-channel video synchronous playback means, described synchronous processing unit 431, comprising:
Judgment sub-unit 4311, for stabbing according to the described standard time, in described multi-channel video, judges whether the timestamp of the video beyond described normal video is greater than stamp of described standard time;
First synchronous subelement 4312, during for being greater than stamp of described standard time when the timestamp of described video, then exports a upper frame of video, again until the timestamp of described video stabs identical with the described standard time;
Second synchronous subelement 4313, during for being less than stamp of described standard time when the timestamp of described video, losing described video current frame data, obtains next frame of video, until the timestamp of video stabs identical with the described standard time.
The device that the embodiment of the present invention provides can be applied in the embodiment of the method for aforementioned correspondence, and details, see the description of above-described embodiment, do not repeat them here.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that can add required common hardware by software to the present invention and realizes.Described program can be stored in read/write memory medium, described storage medium, as random asccess memory, flash memory, read-only memory, programmable read only memory, electrically erasable programmable memory, register etc.This storage medium is positioned at memory, and processor reads the information in memory, performs the method described in each embodiment of the present invention in conjunction with its hardware.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can want easily to change or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a multi-channel video synchronized playback method, is characterized in that, comprising:
Obtain multiple timestamps of the multi-channel video of current broadcasting;
In multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
Stab according to the described standard time, adjust the frame of video of described multi-channel video, play described multi-channel video until synchronous.
2. multi-channel video synchronized playback method according to claim 1, is characterized in that, multiple timestamps of the multi-channel video of the current broadcasting of described acquisition, are specially:
Multiple timestamps of the multi-channel video of current broadcasting are obtained in pre-configured concordance list.
3. multi-channel video synchronized playback method according to claim 2, is characterized in that, described in described concordance list, obtain multiple timestamps of the multi-channel video of current broadcasting before, comprising:
Extract the temporal information of frame of video in multi-channel video, according to described temporal information configuration index table.
4. multi-channel video synchronized playback method according to claim 1, is characterized in that, describedly stabs according to the described standard time, adjusts the frame of video of described multi-channel video, plays described multi-channel video, be specially until synchronous:
Stab according to the described standard time, in described multi-channel video, the frame of video of the video of adjustment except described normal video, plays described multi-channel video until synchronous.
5. the multi-channel video synchronized playback method according to power 4, describedly stabs according to the described standard time, and in described multi-channel video, the frame of video of the video of adjustment except described normal video except, until the described multi-channel video of synchronous broadcasting, is specially:
Stab according to the described standard time, in described multi-channel video, judge whether the timestamp of the video beyond described normal video is greater than stamp of described standard time;
When the timestamp of described video is greater than stamp of described standard time, then again export a upper frame of video, until the timestamp of described video stabs identical with the described standard time;
When the timestamp of described video is less than stamp of described standard time, loses described video current frame data, obtain next frame of video, until the timestamp of video stabs identical with the described standard time.
6. a multi-channel video synchronous playback means, is characterized in that, comprising:
Timestamp acquisition module, for obtaining multiple timestamps of the multi-channel video of current broadcasting;
Module selected by label time stamp, and in multiple timestamps of described multi-channel video, a selected wherein road video is normal video, and the timestamp of described normal video is standard time stamp;
Synchronous processing module, for stabbing according to the described standard time, adjusts the frame of video of described multi-channel video, plays described multi-channel video until synchronous.
7. multi-channel video synchronous playback means according to claim 6, is characterized in that, described timestamp acquisition module, comprising:
Timestamp acquiring unit, obtains multiple timestamps of the multi-channel video of current broadcasting in pre-configured concordance list.
8. multi-channel video synchronous playback means according to claim 7, is characterized in that, described timestamp acquisition module, also comprises:
Concordance list dispensing unit, extracts the temporal information of frame of video in multi-channel video, according to described temporal information configuration index table.
9. multi-channel video synchronous playback means according to claim 6, it is characterized in that, synchronous processing module comprises:
Synchronous processing unit, for stabbing according to the described standard time, in described multi-channel video, the frame of video of the video of adjustment except described normal video, plays described multi-channel video until synchronous.
10. multi-channel video synchronous playback means according to claim 9, is characterized in that, described synchronous processing unit comprises:
Judgment sub-unit, for stabbing according to the described standard time, in described multi-channel video, judges whether the timestamp of the video beyond described normal video is greater than stamp of described standard time;
First synchronous subelement, during for being greater than stamp of described standard time when the timestamp of described video, then exports a upper frame of video, again until the timestamp of described video stabs identical with the described standard time;
Second synchronous subelement, during for being less than stamp of described standard time when the timestamp of described video, losing described video current frame data, obtains next frame of video, until the timestamp of video stabs identical with the described standard time.
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