CN102547248B - Multi-channel real-time monitoring single-video-file recording method - Google Patents
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Abstract
The invention relates to a multi-channel real-time monitoring single-video-file recording method, which comprises the following steps that: (A) video signals of more than one video source are acquired, are encoded by using an encoder, and then, are outputted to a server, and the server outputs the video signals to a display device for displaying; (B) the display device displays the video signals of a current video source through a big window and displays the video signals of other video sources through small windows, and meanwhile, the server records the video signals of the current video source; and (C) the video source of the video signals displayed in the big window of the display device can be switched through operations, and the server records the video signals of the switched video source while the video source of the video signals displayed in the big window of the display device is switched until the next-time switching is carried out or the recording is finished. According to the multi-channel real-time monitoring single-video-file recording method, the switching of the video sources can be carried out by using the display device, and only useful video information is recorded, so that not only are the time and the work for follow-up editing saved, but also plenty of storage space can also be saved.
Description
Technical field
The present invention discloses a kind of video monitoring method for recording, particularly a kind of Multi-channel real-time monitoring single-video-file recording method for education sector.
Background technology
Along with the raising of people's living standard and quality of life, people's awareness of safety also strengthens gradually, and the application of video monitoring in people's daily life is also more and more extensive, application is also more and more, not only relate to safety-security area, also extend to other field, as education etc.The current education sector video monitoring system that is applied to, conventionally be all to adopt camera acquisition vision signal, as: teachers situation, student classroom performance situation etc., after encoded device coding, send to monitor (being sent to the departments such as Bureau of Education as principal chamber or by network) to show, some supervisory control system, in order to carry out playback to monitoring content, adopts video tape recorder to record the vision signal of camera acquisition, for later playback.Video tape recorder of the prior art is all the vision signal of all camera acquisitions to be carried out to all the period of time record conventionally, but, the vision signal of camera acquisition is not all useful constantly, the vision signal that may be only a certain period collection is just valuable, and video tape recorder is all recorded the vision signal of camera acquisition, will certainly record a large amount of garbages, so not only wasted the memory space of video tape recorder, and, when playback in the future, also can waste the plenty of time and go montage, extraction useful information to update, record.Particularly like this in education sector, in a certain class of possibility, only need a certain period to monitor teacher's performance, another period is monitored student's performance, middle other videos that insert, as: teacher suggestion, courseware etc., just need to carry out montage again, integration to the video information collecting etc., can waste plenty of time and energy.
Summary of the invention
For the video monitoring system that is applied to education sector in the above-mentioned prior art of mentioning, all vision signals are all recorded, can cause the shortcoming of unnecessary waste, the invention provides a kind of new Multi-channel real-time monitoring single-video-file recording method, it can only switch and record the useful information in multi-path monitoring, generate single video file, not only the useful rate of information is high, but also can save montage time and memory space.
The technical scheme that the present invention solves its technical problem employing is: a kind of Multi-channel real-time monitoring single-video-file recording method, method comprises the steps:
A, more than one video source gather vision signal, and export to server after encoding by encoder, and server outputting video signal shows to display unit;
B, display unit show the vision signal in current video source by large window, and by wicket, show the vision signal of other video source, and meanwhile, server is recorded the vision signal in current video source;
C, the video source of large window display video signal that can switching display device by operation, in the time of the video source of the large window display video signal of switching display device, server is recorded the vision signal of the video source after switching, until switch or recorded next time, form single video file.
The technical scheme that the present invention solves its technical problem employing further comprises:
During the video source of the large window display video signal of described switching display device, display unit sends to server by the encoder numbering in target video source, and server is recorded the vision signal of the encoder input of corresponding numbering.
Described server is received after Switch Video source signal, send a signal to the encoder of reference numeral, encoder is after receiving the signal of server, the video I frame of encoding immediately, and I frame is sent to server, server writes video file by I frame data, and this encoder data after I frame is all write to video file.
It is described after server is connected with encoder, can send an output resolution ratio instruction to encoder, no matter the leading portion video source of encoder is how many resolution, when it is received after the output resolution ratio instruction of server transmission, the resolution of the vision signal of its output of resolution adjustment of setting in the output resolution ratio instruction that can send according to server, exports to server after being adjusted into the resolution of setting in the output resolution ratio instruction that server sends.
When described display unit is carried out video source switching, can input by mouse-click wicket, mouse double-click wicket and/or keyboard.
When described video source is switched, server can be revised the timestamp of the video data frame receiving according to the local time, thereby made image more level and smooth.
When described server is revised the timestamp of the video data frame receiving, video flowing for non-film mode, according to its video frame rate accumulation for the previous period, calculate a frame per second scope, if current frame rate is super, go beyond the scope, it is corrected, refresh frame per second scope as a reference simultaneously.
The invention has the beneficial effects as follows: the present invention can carry out video source switching by display unit, only useful video information is recorded, not only save time and the work of later stage montage, and can also save a large amount of memory spaces, can guarantee the effective rate of utilization of video information simultaneously.
Below in conjunction with embodiment, the present invention will be further described.
Embodiment
The present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with the present embodiment or approximate with basic structure, all within protection range of the present invention.
The present invention is mainly a kind of method for recording of video monitoring system video file, video monitoring system used in the present invention, mainly comprise that the video camera for gathering vision signal (includes but not limited to teacher's video camera, student's video camera etc.), to the encoder of the encoding video signal of camera acquisition (in the present invention, each encoder has own corresponding numbering, and in presence server), for controlling the server of the work such as video camera and for the display unit of display video signal, its common supervisory control system network that forms, in the present invention, display unit can also be connected on Ethernet, by network, carry out remote monitoring, realize network long distance control system.In the present embodiment, display unit adopts PC, i.e. PC, and it can be connected on Ethernet, and supervisory control system is carried out to Long-distance Control and monitoring etc.Video source in the present embodiment, except gathering the video camera of vision signal, can also include other video source, as: VGA signal, teacher's teaching materials, courseware or classroom animation etc.
Multi-channel real-time monitoring single-video-file recording method in the present invention mainly comprises the steps:
A, more than one video source gather vision signal, and export to server after encoding by encoder, server outputting video signal shows to display unit, in the present embodiment, server can also carry out remote transmission by Ethernet, realizes network video monitoring;
B, display unit are (in the present embodiment, display unit is the display of remote computer) upper display video information, in the present embodiment, display unit shows the vision signal in current video source by large window, and by wicket, show the vision signal of other video source, meanwhile, server is recorded the vision signal in current video source;
C, the video source of large window display video signal that can switching display device by operation, in the present embodiment, when display unit is carried out video source switching, can pass through mouse-click wicket, mouse is double-clicked wicket and/or keyboard input, in the time of the video source of the large window display video signal of switching display device, server is recorded the vision signal of the video source after switching, until switch or recorded next time, form single video file, when video source is switched, server can be revised the timestamp of the video data frame receiving according to the local time, thereby make image more level and smooth, when server is revised the timestamp of the video data frame receiving, video flowing for non-film mode, according to its video frame rate accumulation for the previous period, calculate a frame per second scope, if current frame rate is super, go beyond the scope, it is corrected, refresh frame per second scope as a reference simultaneously.In the present embodiment, this step can be divided into following several small step:
During the video source of the large window display video signal of C-1, switching display device, display unit sends to server by the encoder numbering in target video source, and server is recorded the vision signal of the encoder input of corresponding numbering;
C-2, after server is connected with encoder, can send an output resolution ratio instruction to encoder, no matter the leading portion video source of encoder is how many resolution, when it is received after the output resolution ratio instruction of server transmission, the resolution of the vision signal of its output of resolution adjustment of setting in the output resolution ratio instruction that can send according to server, after being adjusted into the resolution of setting in the output resolution ratio instruction of server transmission, export to server, carry out video record;
C-3, server are received after Switch Video source signal, send a signal to the encoder of reference numeral, encoder is after receiving the signal of server, the video I frame of encoding immediately, and I frame is sent to server, server writes video file by I frame data, and this encoder data after I frame is all write to video file.
The major function that the inventive method realizes is as follows:
1, clicking WEB(is the display interface of display unit) on button, can eject a control window, all vision signals that can show current classroom in window, include, but are not limited to (the present invention are applied in Teaching Monitoring) such as teacher's camera signal, student's camera signal, VGA signals;
2, in the large display box of centre, show the current vision signal of choosing, and can click other little display boxes by mouse, be switched at any time other roads, to realize the real-time recording editor to current display video.After having recorded, can generate an independent video file, the content of file is in full accord with the displaying contents in large display box.
3, user need to not carry out montage to multi-channel video again after having recorded like this, forms a single file oneself being satisfied with.
4, when recording, the present invention also supports the real-time control to video camera, comprise zoom, movement, presetting bit etc., to obtain better video effect, the present invention also supports unattended automatic recording, the video content of video/VGA is carried out to image algorithm analysis, by server, determine to carry out recording of which.
Detailed step of the present invention is as follows:
1,, when video record starts, except there being the video of actual input source, system is the road files that generate extraly more, to record the video file of real-time montage, in the present embodiment, are referred to as film mode file, i.e. the single video file that the present invention records;
2, when user double-clicks input video source, a certain road by mouse, instructor in broadcasting's control desk (is user's control interface, or be called the display interface of display unit) can be by network emitted signal to server, active user is just in Switch Video source for sign, and the encoder numbering in target video source is sent to server;
3, server is after receiving switching signal, the encoder by network signaling to reference numeral;
4, encoder is after receiving the message of server, the video I frame of encoding immediately, and I frame is sent to server by network, current Video coding has the difference of I frame and non-I frame, in video switch process, if directly switched after mouse is clicked no matter current broadcasting whether be I frame, will bring the problems such as flower screen, image be cracked.So, when the present invention receives handover request at server, needing first to correlative coding device, to send the instruction of a request I frame coding, after receiving I frame, video source could be switched.If the oversize meeting of this process allows user feel serious sluggishness, and within the time of the process of whole [sending request] [coding] [receiving frame] being controlled to 50ms in the present embodiment, user can not feel any delay.And because server is before receiving I frame or at the video that continues to play last road, so even because network or other external causes cause the delay of accepting I frame, for the recorded file generating, does not have Ka Dun yet or be connected not smooth;
5, server writes film mode file by I frame data, and this encoder data after this is all write to film mode file, in the present embodiment, because there are a lot of video encapsulation format in prior art, and Single document all can only have a fixed resolution, can not support real-time change, if switched between the file of different resolution, will cause various demonstration problems, even cause player collapse.So, in the present invention, at all videos that enter server, all by encoder, be scaled to unified resolution, in the present invention, this unified resolution is adjustable, can artificially set.After server is connected with encoder, server can send an output resolution ratio instruction to encoder, and no matter the leading portion video source of encoder is how many resolution, and the resolution of output is all that server is desired.For example, when default output resolution ratio is 1280 * 720, but the resolution of input coding device video is 1024 * 768 or 1920 * 1080, encoder will carry out equal proportion to it and zoom in or out into 1280 * 720, encode again, like this switching of server between a plurality of videos just can smoothness freely, there will not be blank screen midway, player picture size sudden change, and the phenomenon such as player collapse;
6, so circulation, until user Switch Video source next time, in the present invention, due to the switching repeatedly of video and audio, because the frame per second on each road has fluctuation, can produce jitter phenomenon in handoff procedure, likely causes slight video card to pause.Server can be revised the timestamp of the Frame receiving according to the local time, thereby made image more level and smooth.Video flowing for non-film mode (in the present embodiment be except when front be commonly referred to as non-film mode video flowing for other videos of recording beyond the video of synthetic Na road), according to its video frame rate accumulation for the previous period, calculate a frame per second scope, computing formula is: average frame per second * a%+current frame rate in the past * (1-a%) (in the present embodiment, a is a proportionality coefficient, span is from 1-99, likely adjust in all cases, can rule of thumb judge, in the present embodiment, a value is 30 or 40), if current frame rate is super, go beyond the scope, it is corrected, refresh frame per second scope as a reference simultaneously.For example: after recording 2 minutes, the frame period calculating according to the frame per second of first 2 minutes should be at 33ms, but afterwards the frame of an interval 100ms, server can be recorded as the time of this frame 2min+40ms(actual numerical value and can specifically set according to actual needs so), rather than the 2min+100ms of real time, revise reference frame as a reference simultaneously and be spaced apart 38ms(actual numerical value and can specifically set according to actual needs).Because the video flowing of film mode is unsettled, because the frame per second of every road stream all may be different, the frame per second that encoder in the present embodiment is supported is conventionally 5 frame-30 frames, so the frame period time of film mode is decided to be between 30ms-220ms, super going beyond the scope just forced according to maximum (being 220ms) or minimum value (being 30ms) record
When 7, this kind of mode can be by network implementation, generate film mode single current file, on network, live or point can be saved a large amount of bandwidth sowing time, after document recording completes, can save a large amount of edit session of user, handoff procedure smoothness freely, can not produce the phenomenons such as flower screen and card pause yet.
The present invention can carry out video source switching by display unit, only useful video information is recorded, and not only saves time and the work of later stage montage, and can also save a large amount of memory spaces, can guarantee the effective rate of utilization of video information simultaneously.
Claims (4)
1. a Multi-channel real-time monitoring single-video-file recording method, is characterized in that: described method comprises the steps:
A, more than one video source gather vision signal, and export to server after encoding by encoder, and server outputting video signal shows to display unit;
B, display unit show the vision signal in current video source by large window, and by wicket, show the vision signal of other video source, and meanwhile, server is recorded the vision signal in current video source;
C, the video source of large window display video signal that can switching display device by operation, in the time of the video source of the large window display video signal of switching display device, server is recorded the vision signal of the video source after switching, until switch or recorded next time, form single video file, during the video source of the large window display video signal of switching display device, display unit sends to server by the encoder numbering in target video source, server is recorded the vision signal of the encoder input of corresponding numbering, server is received after Switch Video source signal, send a signal to the encoder of reference numeral, encoder is after receiving the signal of server, the video I frame of encoding immediately, and I frame is sent to server, server writes video file by I frame data, and this encoder data after I frame is all write to video file, after server is connected with encoder, can send an output resolution ratio instruction to encoder, no matter the leading portion video source of encoder is how many resolution, when it is received after the output resolution ratio instruction of server transmission, the resolution of the vision signal of its output of resolution adjustment of setting in the output resolution ratio instruction that can send according to server, after being adjusted into the resolution of setting in the output resolution ratio instruction of server transmission, export to server.
2. Multi-channel real-time monitoring single-video-file recording method according to claim 1, is characterized in that: when described display unit is carried out video source switching, can input by mouse-click wicket, mouse double-click wicket and/or keyboard.
3. Multi-channel real-time monitoring single-video-file recording method according to claim 1, is characterized in that: when described video source is switched, server can be revised the timestamp of the video data frame receiving according to the local time.
4. Multi-channel real-time monitoring single-video-file recording method according to claim 3, it is characterized in that: when described server is revised the timestamp of the video data frame receiving, video flowing for non-film mode, according to its video frame rate accumulation for the previous period, calculate a frame per second scope, if current frame rate is super, go beyond the scope, it is corrected, refresh frame per second scope as a reference simultaneously.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105100663A (en) * | 2014-05-15 | 2015-11-25 | 北京同步科技有限公司 | Recording system based on hardware encoders, audio and video processing apparatus, and recording method |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391403B (en) * | 2013-08-23 | 2017-08-25 | 北京奇艺世纪科技有限公司 | A kind of real-time edition method and device for realizing many camera lens video captures |
| CN104601863B (en) * | 2013-09-12 | 2018-05-11 | 深圳锐取信息技术股份有限公司 | A kind of IP matrix systems for recorded broadcast |
| KR102187227B1 (en) * | 2014-02-19 | 2020-12-04 | 삼성전자주식회사 | Method for creating a content and an electronic device thereof |
| CN103841348B (en) * | 2014-03-31 | 2017-03-08 | 华为技术有限公司 | The control method of video and audio recording result, device and system |
| CN104052970B (en) * | 2014-06-17 | 2018-02-06 | 中磊电子（苏州）有限公司 | The relative monitoring method of supervising device |
| CN104506795A (en) * | 2014-12-05 | 2015-04-08 | 苏州阔地网络科技有限公司 | Data switching method and data switching system |
| CN105898370A (en) * | 2015-11-13 | 2016-08-24 | 乐视云计算有限公司 | Multi-camera video player, playing system and playing method |
| CN105578261B (en) * | 2015-12-18 | 2019-04-26 | 无锡天脉聚源传媒科技有限公司 | A kind of method and apparatus of video clipping |
| CN107277598A (en) * | 2016-04-07 | 2017-10-20 | 北京文香信息技术有限公司 | For the net cast VOD system of teaching |
| CN106101704B (en) * | 2016-06-14 | 2019-02-22 | 陈�胜 | A kind of dynamic coding method and apparatus of multiple source synthetic video |
| CN106254805B (en) * | 2016-07-28 | 2018-09-21 | 浙江大华技术股份有限公司 | A kind of storage method of Video data, device and video recorder |
| CN106791551A (en) * | 2016-12-12 | 2017-05-31 | 广东威创视讯科技股份有限公司 | A kind of method of automatic regulating signal source resolution ratio, mosaic screen and system |
| CN106851162A (en) * | 2017-02-17 | 2017-06-13 | 成都依能科技股份有限公司 | video recording method and device |
| CN107333030A (en) * | 2017-05-24 | 2017-11-07 | 阔地教育科技有限公司 | A kind of director method, storage device, straight recording/playing terminal and display processing device |
| TWI672955B (en) * | 2018-08-03 | 2019-09-21 | 奇勤科技股份有限公司 | Recording device and image allocation method |
| CN109327728B (en) * | 2018-11-23 | 2021-10-15 | 深圳市鹰硕技术有限公司 | One-to-many same-screen method, device and system, same-screen equipment and storage medium |
| CN109640168B (en) * | 2018-11-27 | 2020-07-24 | Oppo广东移动通信有限公司 | Video processing method, video processing device, electronic equipment and computer readable medium |
| CN110009951A (en) * | 2019-03-26 | 2019-07-12 | 乐佰科(深圳)教育科技有限公司 | A kind of teaching method and tutoring system of online live streaming teaching programming |
| CN110166841B (en) * | 2019-05-28 | 2021-06-29 | 成都依能科技股份有限公司 | Multi-channel audio and video automatic detection real-time pushing method |
| CN111462868B (en) * | 2020-04-09 | 2023-05-30 | 武汉联影医疗科技有限公司 | Medical image management method, device and storage medium |
| CN112601118B (en) * | 2020-12-07 | 2022-03-15 | 青岛海信传媒网络技术有限公司 | Display device and video recording method |
| CN113242452A (en) * | 2021-06-15 | 2021-08-10 | 中国人民解放军91388部队 | Video display method, device, system, equipment and storage medium |
| CN113873206B (en) * | 2021-10-30 | 2024-05-14 | 珠海研果科技有限公司 | Multi-channel video recording method and system |
| CN115311606B (en) * | 2022-10-08 | 2022-12-27 | 成都华栖云科技有限公司 | Classroom recorded video validity detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050500U (en) * | 2011-04-08 | 2011-11-23 | 南京汉韬科技有限公司 | Recording and broadcasting device for teaching and training |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080225119A1 (en) * | 2004-01-22 | 2008-09-18 | Shigeyuki Murata | Video Distribution Device |
| CN101207757B (en) * | 2006-12-22 | 2011-04-13 | 乐金电子(中国)研究开发中心有限公司 | Multi-picture recording TV set and display method thereof |
| CN101159843A (en) * | 2007-10-29 | 2008-04-09 | 中兴通讯股份有限公司 | Image switching method and system for improving video switch effect in video session |
| CN201156782Y (en) * | 2008-01-14 | 2008-11-26 | 青岛海信电器股份有限公司 | Television set |
| CN102014278A (en) * | 2010-12-21 | 2011-04-13 | 四川大学 | Intelligent video monitoring method based on voice recognition technology |
-
2012
- 2012-02-03 CN CN201210023748.4A patent/CN102547248B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202050500U (en) * | 2011-04-08 | 2011-11-23 | 南京汉韬科技有限公司 | Recording and broadcasting device for teaching and training |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105100663A (en) * | 2014-05-15 | 2015-11-25 | 北京同步科技有限公司 | Recording system based on hardware encoders, audio and video processing apparatus, and recording method |
| CN105100663B (en) * | 2014-05-15 | 2019-04-23 | 北京同步科技有限公司 | Recording system, audio-video processing unit and method for recording based on hardware coder |
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