CN115767127A - Double-channel video recording device - Google Patents
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Abstract
The invention relates to a dual-channel video recording device, belonging to the technical field of Ethernet communication technology and video source coding. The device neither needs to destroy or adjust the layout on the original console mouse keyboard operation platform, nor needs to frequently insert and pull DVI signal cables during normal work and video playback, and realizes storage and playback of video signals output by two displays of the console. The device utilizes the KVM switcher to realize that the double-display is shared by the console computer and the video recording equipment, and the picture is output in real time or the picture is recorded and replayed on the double-display, the video files of the two recorded and fetched displays can realize synchronous fast forward, synchronous fast backward or synchronous dragging to the same moment when being played, the complete synchronization of the playing of the two video files is ensured, the recorded and fetched video files can be downloaded through the Ethernet to carry out local replay, the device has the function of protecting abnormal power failure data, and the subsequent expandable function of the capacity of the solid state disk is supported.
Description
Technical Field
The invention belongs to the technical field of Ethernet communication technology and video source coding, and particularly relates to a two-channel video recording device.
Background
The control console of a certain control system consists of three parts, namely two displays, a mouse and keyboard operation platform and a computer case. Each display has 1 VGA interface and 1 DVI interface, and the console computer outputs two DVI video signals to the two displays respectively. When the console is put into use for a period of time, a user proposes to add a video recording function, and video images output by the two displays of the console are stored in a file, so that the recorded video contents of the two displays can be synchronously played back afterwards.
The video recording function is added on the basis of the original control console, a video recording device needs to be redesigned, and two common implementation methods are provided:
(1) The console computer outputs DVI1 signals to the display 1, outputs DVI2 signals to the display 2, and the display 1 and the display 2 output 2 VGA signals to the video recording device. The video recording device outputs a DVI3 signal to the display 1 and outputs a DVI4 signal to the display 2. When the console computer works normally, the display needs to output real-time working video images, at the moment, DVI3 output signals and DVI4 output signals are manually switched off, and DVI1 output signals and DVI2 output signals are manually switched on; when the recorded video file is played back, the DVI3 output signal and the DVI4 output signal are manually switched on, and the DVI1 output signal and the DVI2 output signal are manually switched off.
Keys are added on a mouse and keyboard operation platform of a control console to realize playback control operation of video images;
(2) The console computer outputs DVI1 signals and DVI2 signals to the video recording device, the video recording device outputs DVI3 signals to the display 1, and DVI4 signals to the display 2. Keys are added on a console mouse and keyboard operation platform to realize switching of real-time output video images and playback control operation of the video images.
The two methods can realize the video recording function of the two displays of the console, but have the defects. The first method needs to adjust the layout on the mouse and keyboard operation platform of the original console, and the structure is greatly changed; meanwhile, DVI signal cables need to be frequently plugged and unplugged during normal work and video playback, and great inconvenience is brought to users. The second method also needs to adjust the layout on the original console mouse keyboard operation platform, and the structural change is larger than that of the first method; although the method does not need to switch DVI signal cables, when the console normally outputs the real-time working video image, once the video recording equipment fails, the real-time working video image cannot be normally output on the display.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a two-channel video recording device, solved "realize the inconvenient and not high reliable problem of the synchronous video recording operation of two displays on the hardware basis of current control cabinet".
(II) technical scheme
In order to solve the above technical problem, the present invention provides a method for designing a dual channel video recording apparatus, the method is designed to include a video recording device and a console computer, the console computer includes two KVM switches;
the video recording apparatus includes:
the self-checking module is used for checking the working state of a video acquisition module, a video storage module and a video playing and displaying module of the video recording equipment after the video recording equipment is powered on, and sending a checking result to a console computer through an Ethernet after each self-checking is finished;
the video acquisition module is connected with the self-checking module and is used for acquiring two-channel VGA signals output by two displays in the console in real time;
the video storage module is connected with the video acquisition module and used for performing video format conversion on the acquired two-channel VGA video signal, generating and naming a video file, and segmenting and storing the video file;
and the video playing and displaying module is connected with the video storage module and is used for playing the video file stored by the video storage module and displaying the playing content in a specified display.
The console computer, the two displays of the console and the video recording device are powered on simultaneously; outputting a first DVI output signal, namely a DVI1 output signal, of the console computer to a first display by operating a first KVM switch, namely a KVM1 switch, in the console computer, and then outputting a first VGA signal, namely a VGA1 signal, to the video recording equipment by the first display; meanwhile, a second DVI output signal, namely a DVI2 output signal, of the console computer is output to a second display by operating a second KVM switch, namely a KVM2 switch, in the console computer, and then the second display outputs a second VGA signal, namely a VGA2 signal, to the video recording equipment; after the video recording equipment is powered on, the video acquisition module automatically and synchronously acquires two-channel VGA video signals output by two displays of the console;
when the video recording equipment receives the 'video recording start' sent by any KVM switcher in the console computer, the video recording equipment newly generates two video files named according to the current system time format, and stores the video signals which are acquired in real time and converted in format in the video files; when the video recording device receives a command of stopping recording videos sent by any KVM switcher, the video recording device stops the recording work of the two currently opened video files and closes the two video files.
Preferably, the working state check includes power-on initialization self-check and power-on periodic self-check, and the self-check content includes hardware states, working states, health states and remaining storage capacities of a video acquisition module, a video storage module and a video playing display module in the video recording device.
Preferably, the console computer sends the time of the console computer to the video recording device through the ethernet, and maintains the time synchronization of the two devices. When a video storage module starts to generate a new video file for storing an MP4 format file, the current system time is acquired, the format is 'xx minutes xx seconds when xx year xx month xx day xx is' and the naming specification of a newly generated first display video file is as follows: current system time + N001, i.e., "xx minutes xx seconds N001" in xx years xx months xx days xx; the naming specification of the newly generated second display video file is: current System time + N002, i.e., "xx years xx month xx day xx time xx minutes xx seconds N002".
Preferably, after the video recording device is powered on, the video storage module automatically starts to synchronously store the two-channel VGA video signals output by the two monitors of the console, names and stores the video files recorded by the two monitors of the console respectively, firstly, the collected VGA signals are compressed and encoded according to the h.264 standard, and then, the format of the video files is converted into the MP4 format and stored.
Preferably, when the size of the stored single video file is larger than 1000MB, the console computer automatically generates a new video file named by the current system time, and can realize the cyclic storage of the video file, and the cyclic storage principle is as follows: when a new storage video file is generated, if the remaining storage space of the solid state disk is in the interval (15%, 20%), deleting the oldest stored video file until the remaining storage space of the solid state disk is more than 20%.
Preferably, if the console computer is abnormally powered off at the time of T0, the video recording device and the console computer are powered off at the same time, the video storage module can completely store all video data output by the two displays before the time of T0-10s, when abnormal power off occurs, the self-checking module monitors that the working voltage of the device is lower than a specified threshold value, an 'immediate standby' command is sent to the video storage module, the video storage module immediately stops the receiving and writing work of the video data, and all data in the receiving buffer area are written into the nonvolatile NAND unit.
Preferably, the video recording device further has a Log recording function, and is configured to implement system Log recording, where the Log recording includes a system start Log, a device self-check Log, a state reporting Log, a parameter setting Log, log information of a user operation and a working process, logs of a software internal operation, a software running Log, a window display, a closing Log, and software start loading, and the Log recording has a form of storage in a disk file, and a file naming format is "Log _ xx year xx month xx day xx hour xx minute xx seconds".
Preferably, the console computer and the video recording device share a set of mouse, keyboard and display, and when a video file recorded by the video recording device needs to be played on the display, the first KVM switch, i.e., the switching controller of the KVM1 switch, selects "the video recording device" and outputs a third DVI output signal, i.e., the DVI3 output signal, of the video recording device to the first display; meanwhile, the second KVM switch, i.e., the switching controller of the KVM2 switch, selects "video recording device", and outputs the fourth DVI output signal, i.e., the DVI4 output signal, of the video recording device to the second display, where both displays display the content in the video recording device.
Preferably, each KVM switch includes a switch controller, a video switch, and a mouse switch; a keyboard on a mouse and keyboard operation platform of the console is used as a switching controller of the KVM switcher, four groups of combined keys are arranged on the keyboard and respectively represent 'a console computer outputs a first display', 'a console computer outputs a second display', 'a video recording device outputs a third display' and 'a video recording device outputs a second display'; when any one of the combination keys is pressed on a keyboard of the console mouse keyboard operation platform, a switching signal is sent to each KVM switch, and after the KVM switch receives a switching control signal of 'the console computer outputs the first display', the mouse switching device of the KVM switch outputs the mouse signal to the console computer and outputs a DVI signal of the console computer to the first display through the video switching device of the KVM switch; after receiving a switching control signal of 'the console computer outputs the second display', the KVM switcher outputs a mouse signal to the console computer through a mouse switching device of the KVM switcher and outputs a DVI signal of the console computer to the second display through a video switching device of the KVM switcher; after receiving a switching control signal of 'the video recording equipment outputs the first display', a mouse switching device of the KVM switcher outputs a mouse signal to the video recording equipment and outputs a DVI signal of the video recording equipment to the first display through the video switching device of the KVM switcher; after the KVM switcher receives a switching control signal of the video recording equipment for outputting the second display, the mouse switching device of the KVM switcher outputs a mouse signal to the video recording equipment and outputs a DVI signal of the video recording equipment to the second display through the video switching device of the KVM switcher; if the switching controller selects the video recording device, the KVM switcher sends a command of stopping recording the video to the video recording device; if the switch controller selects "Console computer", the KVM switch sends a "start recording video" command to the video recording device.
The invention also provides a dual-channel video recording device designed by the method.
(III) advantageous effects
The dual-channel video recording device provided by the invention has the advantages that the layout on the original console mouse and keyboard operation platform is not required to be damaged or adjusted, the DVI signal cable is not required to be frequently plugged and unplugged during normal work and video playback, the video signals output by the two displays of the console are stored and played back, and compared with the prior art, the dual-channel video recording device is small in structural change and more convenient and faster to operate. The device utilizes the KVM switcher to realize that the console computer and the video recording equipment share the double displays, and output pictures or record playback pictures on the double displays in real time, the video files of the two recorded displays can realize synchronous fast forward, synchronous fast backward or synchronous dragging to the same moment when being played, the complete synchronization of the playing of the two video files is ensured, the recorded video files can be downloaded through Ethernet to carry out local playback, the device has the function of abnormal power failure data protection, the subsequent expandable function of the capacity of the solid state disk is supported, and the problem of inconvenient and low reliability of synchronous video recording operation of the two displays on the basis of the hardware of the existing console is solved.
Drawings
FIG. 1 is a schematic diagram of a dual channel video recording apparatus according to the present invention;
FIG. 2 is a schematic view of the video recording apparatus in the dual channel video recording apparatus of the present invention;
FIG. 3 is a schematic diagram of a KVM switch in the dual channel video recorder of the present invention;
fig. 4 is an overall operation flow diagram of the dual channel video recording apparatus of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
FIG. 1 is a schematic diagram of a dual-channel video recording apparatus according to the present invention, the apparatus includes a video recording device, a console computer, the console computer includes two KVM switches; the device can simultaneously acquire and store VGA video signals output by the two displays, realizes real-time display and video playback of contents in a console computer or video recording equipment on the double displays through the KVM switcher, and can realize complete recording and synchronous playback of videos output by the two displays under the condition of not influencing the normal output of working video images by the console. The device is a video recording function newly added on the basis of original console hardware, and the layout on an original console mouse keyboard operation platform does not need to be damaged or adjusted.
As shown in fig. 2, the video recording apparatus includes:
the self-checking module 11 is used for checking the working state of a video acquisition module, a video storage module and a video playing and displaying module of the video recording equipment after the video recording equipment is powered on;
the video acquisition module 12 is connected with the self-checking module 11 and is used for acquiring two-channel VGA signals output by two displays in the console in real time;
the video storage module 13 is connected with the video acquisition module 12 and is used for performing video format conversion on the acquired two-channel VGA video signals, generating and naming video files, and segmenting and storing the video files;
and a video playing and displaying module 14 connected to the video storage module 13, and configured to play the video file stored in the video storage module 13 and display the playing content on a specified display.
The working state inspection comprises power-on initialization self-inspection and periodic self-inspection after power-on, the self-inspection content comprises hardware states, working states, health states and residual storage capacities of a video acquisition module, a video storage module and a video playing display module in the video recording equipment, and after each self-inspection is completed, the self-inspection module sends a self-inspection result to a console computer through an Ethernet.
The console computer, the two displays of the console and the video recording device are powered on simultaneously; outputting a first DVI output signal, namely a DVI1 output signal, of the console computer to a first display, namely a display 1, by operating a first KVM switch, namely a KVM1 switch, in the console computer, and then outputting a first VGA signal, namely a VGA1 signal, to the video recording device by the first display; meanwhile, a second DVI output signal, namely a DVI2 output signal, of the console computer is output to a second display, namely a display 2, by operating a second KVM switch, namely a KVM2 switch, in the console computer, and then the second display, namely the display 2, outputs a second VGA signal, namely a VGA2 signal, to the video recording device; after the video recording equipment is powered on, the video acquisition module automatically and synchronously acquires two-channel VGA video signals output by two displays of the console. The above operation is a default operation after the console computer, the two displays of the console, and the video recording device are powered on simultaneously.
After the video recording equipment is powered on, the video storage module automatically starts to synchronously store the two-channel VGA video signals output by the two monitors of the console, names and stores the video files recorded by the two monitors of the console respectively, firstly, the collected VGA signals are compressed and encoded according to the H.264 standard, and then, the format of the video files is converted into the MP4 format and stored.
The console computer sends the time of the console computer to the video recording equipment through the Ethernet, and the time synchronization of the two equipment is kept. When a video storage module starts to generate a new video file for storing an MP4 format file, the current system time is acquired, the format is 'xx minutes xx seconds when xx year xx month xx day xx is' and the naming specification of a newly generated first display video file is as follows: current system time + N001, i.e., "xx minutes xx seconds N001 in xx years xx months xx days xx"; the naming specification of the newly generated second display video file is: current System time + N002, i.e., "xx years xx month xx day xx time xx minutes xx seconds N002".
When the video recording equipment receives the 'video recording start' sent by a KVM switcher in a console computer, the video recording equipment newly generates two video files named according to the current system time format, and stores video signals acquired in real time and converted in format in the video files; when the video recording device receives a command of stopping recording videos sent by the KVM switcher, the video recording device stops the recording work of the two currently opened video files and closes the two video files.
When the size of a single stored video file is larger than 1000MB (software configurable), a new video file named according to the current system time is automatically generated in the console computer, and the cyclic storage of the video file can be realized. The principle of the cycle storage is as follows: when a new storage video file is generated, if the residual storage space of the solid state disk is in the interval (15%, 20%), deleting the video file stored earliest until the residual storage space of the solid state disk is more than 20%.
If the control console computer is abnormally powered off at the time of T0 (T0 is more than 10 s), the video recording device and the control console computer are simultaneously powered off, the video storage module can completely store all video data output by the two displays before the time of T0-10s, when the power is abnormally powered off, the self-checking module monitors that the working voltage of the device is lower than a specified threshold value, an 'instant standby' command is sent to the video storage module, the video storage module immediately stops the receiving and writing work of the video data, and all data in the receiving buffer area are written into the nonvolatile NAND unit.
The video recording equipment also has a Log recording function and is used for realizing system Log recording, the Log recording comprises a system starting Log, an equipment self-checking Log, a state reporting Log, a parameter setting Log, log information of user operation and a working process, logs of software internal operation, a running Log, window display, a closing Log, software starting loading and the like, the Log recording is in a disk file storage form, and a file naming format is 'Log _ xx year xx month xx day xx time xx minute xx second'.
The console computer and the video recording device share one set of mouse, keyboard and display, when a video file recorded by the video recording device needs to be played on the display, the first KVM switch, namely a switching controller of the KVM1 switch, selects the video recording device, and outputs a third DVI output signal, namely a DVI3 output signal, of the video recording device to the first display, namely the display 1; meanwhile, the switching controller of the second KVM switch, i.e., the KVM2 switch, selects "video recorder", and outputs the fourth DVI output signal of the video recorder, i.e., the DVI4 output signal, to the second display, i.e., the display 2. At this time, what is displayed in both displays is the content in the video recording apparatus.
The schematic diagram of the KVM switches of the dual channel video recording device is shown in FIG. 3. Each KVM switch comprises a switch controller, a video switch and a mouse switch. The keyboard on the console mouse keyboard operation platform is used as a switching controller of the KVM switch, and four groups of combination keys are provided on the keyboard, which respectively represent "console computer output display 1", "console computer output display 2", "video recording device output display 1", and "video recording device output display 2". When any one of the combination keys is pressed on a keyboard of the console mouse keyboard operation platform, a switching signal is sent to each KVM switch, and after the KVM switch receives a switching control signal of 'the console computer outputs a display 1', the mouse switching device of the KVM switch outputs the mouse signal to the console computer and outputs a DVI signal of the console computer to the display 1 through the video switching device of the KVM switch; after receiving the switching control signal of 'the console computer outputs the display 2', the KVM switcher mouse switching device outputs the mouse signal to the console computer and outputs the DVI signal of the console computer to the display 2 through the video switching device of the KVM switcher; after receiving a switching control signal of 'the video recording equipment outputs the display 1', a mouse switching device of the KVM switcher outputs a mouse signal to the video recording equipment and outputs a DVI signal of the video recording equipment to the display 1 through the video switching device of the KVM switcher; after receiving the switching control signal of the video recording equipment output display 2, the KVM switcher outputs the mouse signal to the video recording equipment through the mouse switching device of the KVM switcher and outputs the DVI signal of the video recording equipment to the display 2 through the video switching device of the KVM switcher; if the switching controller selects the video recording device, the KVM switcher sends a command of stopping recording the video to the video recording device; if the switch controller selects "Console computer", the KVM switch sends a "start recording video" command to the video recording device.
All video files recorded by the video recording equipment can be checked through the display 1 and the display 2, the video files to be played are selected through the mouse, and meanwhile, the two players are opened to play the video files.
Local video playback is carried out by utilizing two displays of the console, and the two players respectively display and synchronously play the contents of the two video files in the two displays of the console; the video playing display module is utilized to realize synchronous playing of video contents in the two players; the video playing and displaying module can control the two players to fast forward and fast backward at the same time when playing the video content, or control the complete synchronization of the video content played in the two players by dragging the playing progress bar on the video playing and displaying module. The two players share the following playing components: a play progress bar, a fast forward button, a fast reverse button, a play button, a pause button, and a stop button.
When the video playing display module is quitted after the video is played, the switching controller of the KVM1 switcher selects 'console computer', outputs a DVI1 output signal of the console computer to the display 1, and then the display 1 outputs a VGA1 signal to the video recording equipment; meanwhile, the switching controller of the KVM2 switcher selects 'console computer', outputs DVI2 output signals of the console computer to the display 2, and then the display 2 outputs VGA2 signals to the video recording equipment; the video recording device starts to re-collect and store the two-channel VGA video signals output by the two displays.
It can be seen that the scheme of the invention can perfectly solve the problems of inconvenient and low reliability of realizing the synchronous video recording operation of two displays on the basis of the hardware of the existing console. The invention realizes that the console computer and the video recording equipment share the double displays by utilizing the KVM switcher, not only can output pictures and playback recorded pictures on the double displays in real time, but also realizes the synchronous play control of the video files recorded by the two displays. In addition, the device has the function of protecting abnormal power-off data of the equipment, and supports the capacity of the solid state disk to be expandable.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A design method of a double-channel video recording device is characterized in that the method is designed to comprise a video recording device and a console computer, wherein the console computer comprises two KVM switchers;
the video recording apparatus includes:
the self-checking module is used for checking the working state of a video acquisition module, a video storage module and a video playing and displaying module of the video recording equipment after the video recording equipment is powered on, and sending a checking result to a console computer through an Ethernet after each self-checking is finished;
the video acquisition module is connected with the self-checking module and is used for acquiring two-channel VGA signals output by two displays in the console in real time;
the video storage module is connected with the video acquisition module and is used for converting the video format of the two-channel VGA video signal acquired by the video acquisition module, generating and naming a video file, and segmenting and storing the video file;
and the video playing and displaying module is connected with the video storage module and is used for playing the video file stored by the video storage module and displaying the playing content in a specified display.
The console computer, the two displays of the console and the video recording device are powered on simultaneously; outputting a first DVI output signal, namely a DVI1 output signal, of the console computer to a first display by operating a first KVM switch, namely a KVM1 switch, in the console computer, and then outputting a first VGA signal, namely a VGA1 signal, to the video recording equipment by the first display; meanwhile, a second DVI output signal, namely a DVI2 output signal, of the console computer is output to a second display by operating a second KVM switch, namely a KVM2 switch, in the console computer, and then the second display outputs a second VGA signal, namely a VGA2 signal, to the video recording equipment; after the video recording equipment is powered on, the video acquisition module automatically starts to synchronously acquire two-channel VGA video signals output by two displays of the console;
when the video recording equipment receives the 'start video recording' sent by any KVM switcher in the console computer, the video recording equipment newly generates two video files named according to the current system time format, and stores the video signals which are acquired in real time and converted in format into the video files; when the video recording device receives a command of stopping recording videos sent by any KVM switcher, the video recording device stops the recording work of the two currently opened video files and closes the two video files.
2. The method as claimed in claim 1, wherein the working status check includes a power-on initialization self-check and a power-on periodic self-check, and the self-check contents include hardware status, working status, health status and remaining storage capacity of a video acquisition module, a video storage module and a video playing display module in the video recording device.
3. The method of claim 1, wherein the console computer sends the time of the console computer to the video recording device via ethernet, and keeps time synchronization between the two devices, and the video storage module obtains the current system time when starting to generate a new video file for storing an MP4 format file, the format being "xx minutes xx seconds when xx month xx days xx in xx years, xx minutes xx seconds", and the naming specification of the newly generated first display video file is: current system time + N001, i.e., "xx minutes xx seconds N001" in xx years xx months xx days xx; the naming specification of the newly generated second display video file is: current System time + N002, i.e., "xx years xx month xx day xx time xx minutes xx seconds N002".
4. The method as claimed in claim 1, wherein after the video recording device is powered on, the video storage module automatically starts to synchronously store the dual-channel VGA video signals output by the two monitors of the console, names and stores the video files recorded by the two monitors of the console respectively, first compresses and codes the collected VGA signals according to the h.264 standard, and then converts the format of the video files into the MP4 format for storage.
5. The method of claim 1, wherein when the size of the stored single video file is larger than 1000MB, the automatic generation in the console computer of a new video file named with the current system time can realize the cyclic storage of the video file by the following principles: when a new storage video file is generated, if the remaining storage space of the solid state disk is in the interval (15%, 20%), deleting the oldest stored video file until the remaining storage space of the solid state disk is more than 20%.
6. The method as claimed in claim 1, wherein if the console computer is abnormally powered off at time T0, the video recording device and the console computer are powered off at the same time, the video storage module can completely store all video data output by the two displays before time T0-10s, and when the power is abnormally powered off, the self-test module monitors that the operating voltage of the video recording device is lower than a specified threshold, sends an "immediate standby" command to the video storage module, the video storage module immediately stops the receiving and writing of the video data, and writes all data in the receiving buffer into the nonvolatile NAND cell.
7. The method of claim 1, wherein the video recording device further has a Log recording function, and is configured to implement system Log recording, where the Log recording includes a system start Log, a device self-check Log, a status report Log, a parameter setting Log, log information of a user operation and a working process, logs of a software internal operation, an operation Log, a window display, a closing Log, and a software start loading, and the Log recording is implemented in a form of disk file storage, and a file naming format is "xx minutes xx seconds" when xx days xx of xx months in xx years.
8. The method of claim 1, wherein the console computer and the video recorder share a set of mouse, keyboard and display, and when a video file recorded by the video recorder needs to be played on the display, the switching controller of the first KVM switch, i.e., KVM1 switch, selects "video recorder" to output the third DVI output signal, i.e., DVI3 output signal, of the video recorder to the first display; meanwhile, the second KVM switch, i.e., the switching controller of the KVM2 switch, selects "video recording device", and outputs the fourth DVI output signal, i.e., the DVI4 output signal, of the video recording device to the second display, where both displays display the content in the video recording device.
9. The method of claim 1, wherein each KVM switch comprises a switch controller, a video switch, and a mouse switch; a keyboard on a mouse and keyboard operation platform of the console is used as a switching controller of the KVM switcher, four groups of combined keys are arranged on the keyboard and respectively represent 'a console computer outputs a first display', 'a console computer outputs a second display', 'a video recording device outputs a third display' and 'a video recording device outputs a second display'; when any one of the combination keys on the keyboard of the console mouse keyboard operation platform is pressed down, a switching signal is sent to each KVM switcher, and after the KVM switcher receives a switching control signal of 'the console computer outputs the first display', the mouse switching device of the KVM switcher outputs the mouse signal to the console computer and outputs a DVI signal of the console computer to the first display through the video switching device of the KVM switcher; after receiving a switching control signal of 'the console computer outputs the second display', the KVM switcher outputs a mouse signal to the console computer through a mouse switching device of the KVM switcher and outputs a DVI signal of the console computer to the second display through a video switching device of the KVM switcher; after receiving a switching control signal of 'the video recording equipment outputs the first display', a mouse switching device of the KVM switcher outputs a mouse signal to the video recording equipment and outputs a DVI signal of the video recording equipment to the first display through the video switching device of the KVM switcher; after the KVM switcher receives the switching control signal of the video recording equipment outputting the second display, the mouse switching device of the KVM switcher outputs the mouse signal to the video recording equipment and outputs the DVI signal of the video recording equipment to the second display through the video switching device of the KVM switcher; if the switching controller selects the video recording device, the KVM switcher sends a command of stopping recording the video to the video recording device; if the switch controller selects "Console computer", the KVM switch sends a "start recording video" command to the video recording device.
10. A dual channel video recording device designed by the method of any one of claims 1 to 9.
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