CN102456376A - Recording and play method for monitoring device - Google Patents
Recording and play method for monitoring device Download PDFInfo
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- CN102456376A CN102456376A CN2010105300023A CN201010530002A CN102456376A CN 102456376 A CN102456376 A CN 102456376A CN 2010105300023 A CN2010105300023 A CN 2010105300023A CN 201010530002 A CN201010530002 A CN 201010530002A CN 102456376 A CN102456376 A CN 102456376A
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Abstract
The invention discloses a recording and play method for a monitoring device, A video recording method for the monitoring device comprises the following steps: after A/V (audio/video) data is synthesized, storing the synthesized data in a recorded-video cache file firstly; and when the recorded-video cache file reaches a preset value, transferring the data to a recording-video file of a memory; and a playback method comprises the following steps of: recording the recording-video file of the memory firstly, then reading the recorded-video cache file when the recorded file is empty. In the invention, through adding an operation of recording a A/V complex data stream in the recorded-video cache file so as to carry out playback, the integrity and timeliness of the A/V data stream reading is achieved. By using the method disclosed by the invention, an A/V data stream which is just recorded can be played by using a monitoring device when a playback function is used, and the difference between the time that an A/V data stream which can be played and the time that the A/V data stream which is real-time previewed is not more than one second. The method is particularly suitable for the real-time operation of the monitoring device, and is beneficial to managers to invoke monitoring videos. The method also can be applied to some special video-recording devices such as devices for special film and TV shooting, and the like.
Description
Technical field
The present invention relates to recording and player method of a kind of audio frequency and video, be meant a kind of instant recording/playback method that is used for watch-dog especially, this method can realize the instant playback of recorded file.
Background technology
The general external memory device of audio-video monitoring equipment (like hard disk, USB flash disk or SD card etc.), monitor (like VGA monitor etc.), audio collecting device (acoustic pickup), video capture device (video camera/The Cloud Terrace) or the like.The Core Feature of audio-video monitoring equipment mainly is on-the-spot preview, video recording storage and playing back videos.
On-the-spot preview: directly the audio, video data with acoustic pickup and camera acquisition directly outputs to audio amplifier and monitor, reaches the live preview scene.Video recording storage: according to the video recording strategy of its equipment; Audio, video data to current real-time on-the-spot preview carries out compressed encoding (fundamental purpose is in order to reduce storage space) respectively; And according to its saving format; Data behind the coding are combined into the audio frequency and video compositing data stream, finally are stored on the memory device; Video recording storage generally is unit with the video file, its video file that has finished to append the video recording data is referred to as complete video file, otherwise is referred to as just at video file.Playing back videos: will be stored in the video recording data on the memory device, and, on watch-dog, reproduce audio frequency and video scene at that time through audio/video decoding; The basic demand of playing back videos is exactly the fluency that will ensure the audio frequency and video playback, synchronism, the authenticity of reconstruction of scenes.
The method of tradition playing back videos is: for the continuity that guarantees playing back videos and controllability, the dirigibility of playback, often only complete video file is carried out playback.Dragging in the convenience file replayed section like this, the location, and retreat, complicated, file playback operation flexibly such as F.F..Later stage, this technology was improved; Can playback current just at video file; But prerequisite must video file writes (generally all greater than 1 minute or more) after a period of time earlier; Guarantee from memory device, all to may be read into correct video recording data, in case take place to equal the current data of storing on the video recording data time for reading in the memory device, file playback closes to an end at every turn.
The improvement of this playback since just at video file just in data, supplemental, unknown its concluding time.So it drags playback, F.F. all is affected, but common normal playback still can guarantee the fluency and the synchronism of its playback, can satisfy replay request, and the real-time of playback is improved greatly.Can not the current video recording problem of playback before this improved playback has improved really, improve the real-time of playback, but this improvement is barely satisfactory.Along with the development of watch-dog, replay request is more and more flexible, and particularly the real-time of playback requires increasingly high.Be the most typical example that the current video recording of playback is used below: reporting to the police appears suddenly in front equipment end, according to its video recording strategy, and trigger equipment warning video recording storage, and carry out audible alarm; The operator on duty knows that through audible alarm this front equipment end is unusual; Check this device context situation immediately; Although after the reaction time that this section extremely lacked; Can check current field condition through on-the-spot preview, but still miss and checking that the report to the police moment of generation and situation before, only way are exactly to have only through playing back videos to check the unusual moment situation that takes place; Need to wait for that one long period could playback this moment, let and monitor the operator on duty and lose the chance of understanding the warning generating process the soonest.
Can find out through top example application; Back method of the prior art fails to solve effectively the problem of real-time; The video recording that can playback and the video recording of on-the-spot preview differed nearly one minute; Cause temporal delay for managerial personnel in time transfer real-time monitoring video, bring great inconvenience for monitoring work.
Summary of the invention
The objective of the invention is to promptly put method for the deficiency that overcomes prior art provides a kind of i.e. record of watch-dog; Adopt this method can use watch-dog when launching playback function; Can carry out playback operation to the audio and video data streams of just having recorded, the audio and video data streams that can carry out audio and video data streams and the live preview of playback operation differs and is no more than a second.
Technology contents of the present invention is: method is promptly put in a kind of i.e. record that is used for watch-dog; The kinescope method of said watch-dog is: 11) audio-video collection equipment is continuously gathered the analog audio-video data, and the processing module of watch-dog constantly is that unit carries out the digitizing conversion to audio, video data with the frame; 12) after watch-dog will be the digitizing audio, video data process audio/video coder of unit respectively with the frame, audio, video data is combined into audio and video data streams, and is stored in the video recording cache file of watch-dog; When 13) capacity of the audio and video data streams of watch-dog processing surpasses video recording buffer memory setting value; The video recording cache file that is filled with is sent to storer; And adopt the mode that covers or empty rewriting by frame, new audio and video data streams is stored in the video recording cache file; 14) watch-dog will be recorded a video cache file when being sent to storer, on its storer, distribute just at video file, and follow-up audio and video data streams just constantly is appended to the back at video file; When 15) video recording finishes, the final stage audio and video data streams in the video recording cache file just is appended in the back of video file, and this is just carried out subsequent treatment at video file, form complete video file; The back method of said watch-dog is: described watch-dog preferentially reads the audio frequency and video compositing data stream in the memory device when starting the just playback at video file; If the time of the audio frequency and video compositing data stream that will read less than in the memory device just in the time of the last frame of video file, then from memory device, read; If the time of the audio frequency and video compositing data stream that will read more than or equal to the up-to-date time of video recording storage in the memory device, is then read the audio frequency and video compositing data stream in the video recording buffer memory.
Its more concrete technology contents can be: described watch-dog is to just being provided with the playback duration coordinate axis based on system time when video file carries out playback; Playback duration coordinate figure during its playback is during less than the difference of system's real-time time and video recording cache file duration, the playback memory device just at video file; Playback duration coordinate figure during its playback is during more than or equal to the difference of system's real-time time and video recording cache file duration, playback record buffering file; Said video recording cache file duration is drawn by the ratio of the rate bit stream of video recording buffer memory setting value and audio and video data streams.
Its more concrete technology contents also can be: described watch-dog is when normal video recording, and the buffer memory setting value of will recording a video is made as maximal value, and when starting the just playback at video file, the buffer memory setting value of will recording a video is adjusted into minimum value.
Its more concrete technology contents can also be: described watch-dog is to just being provided with the playback duration coordinate axis based on system time when video file carries out playback, said video recording cache file and just be equipped with the time coordinate value at every frame audio, video data of video file.Described watch-dog is when playback; Elder generation is in the audio and video data streams of just in video file, finding corresponding time coordinate value of memory device; If during the audio and video data streams of no corresponding time coordinate value, in the video recording cache file, search corresponding audio and video data streams again; When playback is read video recording during cache file, when the video recording cache file is filled with in unloading to the memory device just at video file, when playback is read as sky, return the audio and video data streams of just in video file, searching corresponding time coordinate value of memory device.
Technology contents further is: said when watch-dog when the record buffering file is read in playback; The time coordinate value of the first frame audio and video data streams of the cache file of record video recording earlier; Calculate the time coordinate value of the last frame audio and video data streams of video recording cache file according to the record buffering duration; System's real-time time when playback is read is during greater than the time coordinate value of last frame audio and video data streams, and watch-dog is got back to the memory device relaying and resumed studies and get the audio and video data streams of adjacent time coordinate value.
Playback wherein comprises that normal speed is play, broadcast, F.F. fast, fall back, rewind down and pausing operation.
The present invention's beneficial effect compared with prior art is: the audio frequency and video compositing data stream that the present invention reads in the video recording cache file through increase carries out playback, reaches the integrality that reads audio and video data streams, promptness.Adopt this method can use watch-dog when launching playback function, can carry out playback operation to the audio and video data streams of just having recorded, the audio and video data streams that can carry out audio and video data streams and the live preview of playback operation differs and is no more than a second.Be particularly suitable for the real-time operation of watch-dog, favourable managerial personnel in time transfer monitoring video, also can be used for some special video recording equipments, such as special movies-making etc.
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Description of drawings
Fig. 1 is promptly put first kind of specific embodiment structural representation of method for a kind of i.e. record that is used for watch-dog of the present invention;
Fig. 2 is the workflow synoptic diagram that first kind of specific embodiment of method promptly put in a kind of i.e. record that is used for watch-dog of the present invention.
Description of reference numerals
1 buffer, 11 video recording cache files
2 storeies 21 are just at video file
Embodiment
In order more to make much of technology contents of the present invention, below in conjunction with specific embodiment technical scheme of the present invention is further introduced and explanation, but be not limited to this.
As depicted in figs. 1 and 2, first kind of embodiment of method promptly put in the i.e. record that the present invention is a kind of to be used for watch-dog, and we are that the watch-dog of hard disk is an example with 1 road video, 1 road audio frequency, memory device, and its concrete steps are:
Video process:
11) acoustic pickup and camera acquisition is successive analog audio-video data, and watch-dog forms the original audio and video data streams of digitizing according to the continuous digitizing of speed of per second 25 frames;
12) watch-dog is respectively with behind the original audio/video flow process audio/video coder; According to the compound standard of standard pronunciation video MUX; Audio, video data is combined into audio and video data streams, and is stored in the video recording cache file of watch-dog (each monitor channel is provided with the video recording cache file of an appointment in watch-dog);
13) because video recording cache file size is limited (for example: be set at the 3Mbye size), and audio and video data streams is continuous formation, covers or empties the mode that re-writes and be stored among the video recording cache file so complex data is constantly circulation.
When 14) the video recording storage starts, on hard disk, distribute to form, prepare for being about to append storage data just video file (for example: file is called 0001.dat);
15) watch-dog was according to 1～100 second time interval, and 11～100 seconds complex tone video data streams constantly will depositing in buffer memory are appended to just in video file;
When 16) video recording finishes, finish data, supplemental, and this is just carried out subsequent treatment at video file, form complete video file.
Two: just at the video file replayed section:
21) be 0001.dat at video file just, video recording started in 1 second, beginning playback this document.
22) position of at first on disk (storer), finding this document to store, preparation starts anew to read the data of this document;
23) if read file, then directly from disk, start anew to read not for empty;
24), then directly from the video recording buffer memory, read the data that this document is about to storage if the file that reads is empty;
25) in order to guarantee the integrality of data, need from the video recording buffer memory, read one or more complete MUX data stream;
26) reading of data from the video recording buffer memory if desired, and the video recording buffer memory also do not form a complete MUX data stream, then waits for to forming a complete data stream;
27) reading of data from the video recording buffer memory if desired, and this data division is capped, and perhaps is about to cover, and then turns in the memory disk and searches, and reads this data stream;
28) data that read are separated MUX, form independently audio, video data, and deliver to audio/video decoder respectively and decode, finally the playback controls strategy through watch-dog carries out playback output;
29) stop up to video recording, then read all video recording data that finish, stop playback.
Three: the playback controls operation:
31) if forwarding operation is taked in playback, read up-to-date video recording when data cached when proceeding to soon, then need stop F.F. automatically, get into the normal playback operation;
If pausing operation is taked in playback:
32) before suspending, itself be exactly the video file of reading disk, the time-out continued reads file from original position and carries out playback;
33) if reading the video recording data in buffer when suspending, and after suspending, this part data and further part data have write disk, so need read file from disk after the EOT end of timeout.
In a word: watch-dog starts current just in the video file playback, preferentially reads the audio frequency and video compositing data stream in its memory device; Be about to complete audio frequency and video compositing data stream if exist in the memory device, then from memory device, read, and once whether from the video recording internal memory, read regardless of preceding; If the audio frequency and video compositing data stream that is about to read in memory device on the time greater than the up-to-date time in the video recording storage, then read in the video recording buffer memory audio frequency and video compositing data stream for playback.Currently just change former single from memory device, reading into combine with buffer memory mode from memory device at video file; And the two reads conversion opportunity to require better controlled; In time read up-to-date audio frequency and video compositing data stream; Guarantee that video recording starts in 1 second afterwards, playback at any time is current just at video file, reaches the effect that i.e. record is promptly put.Certainly because the data in the video recording buffer memory are that continuous compound generation and legacy data are recycled covering, need reading of data in the better controlled video recording buffer memory, guarantee to read the integrality of playback of data, promptness.
Present embodiment take to read memory device just at video file and be in the mode that the video recording cache file of buffer combines; And control the conversion opportunity that the two reads; Can read fast and currently just carry out playback, reach the effect that i.e. record is promptly put in the data of video file.
As second kind of specific embodiment; Can go into refinement at basic enterprising one of first kind of specific embodiment: with the time coordinate axle with reference; Watch-dog is to just being provided with the playback duration coordinate axis based on system time when video file carries out playback; Playback duration coordinate figure during its playback is during less than the difference of system's real-time time (audio and video data streams generated time) and video recording cache file duration, the playback memory device just at video file; Playback duration coordinate figure during its playback is during more than or equal to the difference of system's real-time time and video recording cache file duration, playback record buffering file; Video recording cache file duration is drawn by the ratio of the rate bit stream of video recording buffer memory setting value and audio and video data streams.
As the third specific embodiment; Can go into refinement at basic enterprising one of first kind of specific embodiment: watch-dog is when normal video recording; The buffer memory setting value of will recording a video is made as maximal value; Such as according to rate bit stream, when being made as the video recording buffer memory, the size of video recording cache file reaches 100 seconds, can reduce the number of times of the frequent unloading of video recording cache file to storer like this.When starting just playback at video file; The buffer memory setting value of will recording a video is adjusted into minimum value; Video recording buffer memory duration such as 1 second; So can so that just in the playback of video file, most applications just all reads in memory device at video file, though have only under the rare occasion just the video recording buffer memory in a second is read.
As the 4th kind of specific embodiment; Can go into refinement at basic enterprising one of first kind of specific embodiment: watch-dog is to just being provided with the playback duration coordinate axis based on system time when video file carries out playback, video recording cache file and just be equipped with the time coordinate value at every frame audio, video data of video file.Watch-dog earlier in the audio and video data streams of just in video file, finding corresponding time coordinate value of memory device, if during the audio and video data streams of no corresponding time coordinate value, is searched corresponding audio and video data streams again in the cache file of recording a video when playback; When playback is read video recording during cache file, when the video recording cache file is filled with in unloading to the memory device just at video file, when playback is read as sky, return the audio and video data streams of just in video file, searching corresponding time coordinate value of memory device.When watch-dog when the record buffering file is read in playback; The time coordinate value of the first frame audio and video data streams of the cache file of record video recording earlier; Calculate the time coordinate value of the last frame audio and video data streams of video recording cache file according to the record buffering duration; System's real-time time when playback is read is during greater than the time coordinate value of last frame audio and video data streams, and watch-dog is got back to the memory device relaying and resumed studies and get the audio and video data streams of adjacent time coordinate value.
Among above-mentioned each embodiment, playback comprises that normal speed is play, broadcast, F.F. fast, fall back, operations such as rewind down and time-out.
In sum, the audio frequency and video compositing data stream that the present invention reads in the video recording cache file through increase carries out playback, reaches the integrality that reads audio and video data streams, promptness.Adopt this method can use watch-dog when launching playback function, can carry out playback operation to the audio and video data streams of just having recorded, the audio and video data streams that can carry out audio and video data streams and the live preview of playback operation differs and is no more than a second.Be particularly suitable for the real-time operation of watch-dog, favourable managerial personnel in time transfer monitoring video, also can be used for some special video recording equipments, such as special movies-making etc.The above only further specifies technology contents of the present invention with embodiment, so that the reader is more readily understood, but does not represent embodiment of the present invention to only limit to this, anyly extends or recreation according to the technology that the present invention did, and all receives protection of the present invention.
Claims (7)
1. method is promptly put in an i.e. record that is used for watch-dog, it is characterized in that the kinescope method of said watch-dog is:
11) audio-video collection equipment is continuously gathered the analog audio-video data, and the processing module of watch-dog constantly is that unit carries out the digitizing conversion to audio, video data with the frame;
12) after watch-dog will be the digitizing audio, video data process audio/video coder of unit respectively with the frame, audio, video data is combined into audio and video data streams, and is stored in the video recording cache file of watch-dog;
When 13) capacity of the audio and video data streams of watch-dog processing surpasses video recording buffer memory setting value; The video recording cache file that is filled with is sent to storer; And adopt the mode that covers or empty rewriting by frame, new audio and video data streams is stored in the video recording cache file;
14) watch-dog will be recorded a video cache file when being sent to storer, on its storer, distribute just at video file, and follow-up audio and video data streams just constantly is appended to the back at video file;
When 15) video recording finishes, the final stage audio and video data streams in the video recording cache file just is appended in the back of video file, and this is just carried out subsequent treatment at video file, form complete video file;
The back method of said watch-dog is:
Described watch-dog preferentially reads the audio frequency and video compositing data stream in the memory device when starting the just playback at video file;
If the time of the audio frequency and video compositing data stream that will read less than in the memory device just in the time of the last frame of video file, then from memory device, read;
If the time of the audio frequency and video compositing data stream that will read more than or equal to the up-to-date time of video recording storage in the memory device, is then read the audio frequency and video compositing data stream in the video recording buffer memory.
2. method is promptly put in a kind of i.e. record that is used for watch-dog according to claim 1; It is characterized in that described watch-dog is to just being provided with the playback duration coordinate axis based on system time when video file carries out playback; Playback duration coordinate figure during its playback is during less than the difference of system's real-time time and video recording cache file duration, the playback memory device just at video file; Playback duration coordinate figure during its playback is during more than or equal to the difference of system's real-time time and video recording cache file duration, playback record buffering file; Said video recording cache file duration is drawn by the ratio of the rate bit stream of video recording buffer memory setting value and audio and video data streams.
3. method is promptly put in a kind of i.e. record that is used for watch-dog according to claim 1; It is characterized in that described watch-dog is when normal video recording; The buffer memory setting value of will recording a video is made as maximal value, and when starting the just playback at video file, the buffer memory setting value of will recording a video is adjusted into minimum value.
4. method is promptly put in a kind of i.e. record that is used for watch-dog according to claim 1; It is characterized in that described watch-dog to just when video file carries out playback, being provided with playback duration coordinate axis, said video recording cache file and just be equipped with the time coordinate value at every frame audio, video data of video file based on system time.
5. method is promptly put in a kind of i.e. record that is used for watch-dog according to claim 4; It is characterized in that described watch-dog is when playback; Elder generation is in the audio and video data streams of just in video file, finding corresponding time coordinate value of memory device; If during the audio and video data streams of no corresponding time coordinate value, in the video recording cache file, search corresponding audio and video data streams again; When playback is read video recording during cache file, when the video recording cache file is filled with in unloading to the memory device just at video file, when playback is read as sky, return the audio and video data streams of just in video file, searching corresponding time coordinate value of memory device.
6. method is promptly put in a kind of i.e. record that is used for watch-dog according to claim 5; It is characterized in that said when watch-dog when the record buffering file is read in playback; The time coordinate value of the first frame audio and video data streams of the cache file of record video recording earlier; Calculate the time coordinate value of the last frame audio and video data streams of video recording cache file according to the record buffering duration; System's real-time time when playback is read is during greater than the time coordinate value of last frame audio and video data streams, and watch-dog is got back to the memory device relaying and resumed studies and get the audio and video data streams of adjacent time coordinate value.
7. promptly put method according to claim 2,3 or 4 described a kind of i.e. records that are used for watch-dog, it is characterized in that described playback comprises that normal speed is play, broadcast, F.F. fast, fall back, rewind down and pausing operation.
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| CN201010530002.3A CN102456376B (en) | 2010-11-03 | 2010-11-03 | Recording and play method for monitoring device |
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| CN104735412A (en) * | 2015-03-11 | 2015-06-24 | 大连理工大学 | Audio and video synthesizing and synchronous playing method for subway passenger emergency communication |
| CN104836992A (en) * | 2015-05-08 | 2015-08-12 | 无锡天脉聚源传媒科技有限公司 | Surveillance video recording method and device |
| CN105227930A (en) * | 2015-10-27 | 2016-01-06 | 浙江宇视科技有限公司 | Video inspection method and device in a kind of video monitoring system |
| CN106131655A (en) * | 2016-05-19 | 2016-11-16 | 安徽四创电子股份有限公司 | A kind of player method based on real-time video and smooth catch-up playback method |
| CN106231225A (en) * | 2016-09-14 | 2016-12-14 | 深圳市泛海三江科技发展有限公司 | A kind of network hard disk video recorder data processing method and system |
| CN107341090A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of real-time monitoring system based on LabVIEW |
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| CN111246142A (en) * | 2018-11-29 | 2020-06-05 | 杭州海康威视数字技术股份有限公司 | Video file generation method and device and electronic equipment |
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| CN104735412B (en) * | 2015-03-11 | 2017-08-01 | 大连理工大学 | A kind of audio frequency and video synthesis of Metro Passenger emergency communication and synchronous broadcast method |
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| CN111246142B (en) * | 2018-11-29 | 2022-07-01 | 杭州海康威视数字技术股份有限公司 | Video file generation method and device and electronic equipment |
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