CN115766985A - Design method of dual-channel video recording device - Google Patents
Design method of dual-channel video recording device Download PDFInfo
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Abstract
The invention relates to a design method of a dual-channel video recording device, belonging to the technical field of Ethernet communication and video source coding. The invention realizes the storage and synchronous playback of the video signals output by the two displays of the console without destroying or adjusting the layout on the original console mouse and keyboard operation platform or frequently plugging and unplugging DVI signal cables during normal work and video playback. The device utilizes the KVM switch to realize that console computer and video admission equipment share two displays, and real-time output picture or record playback picture on two displays, through integrated DVI split screen ware in the video transmission cable, the VGA interface on the display has not only been saved, the DVI video signal with console computer output directly inserts video admission equipment simultaneously, analog signal to digital signal's conversion has been avoided, the video image of having guaranteed real-time output and the video image of record playback possess same resolution ratio and picture quality.
Description
Technical Field
The invention belongs to the technical field of Ethernet communication technology and video source coding, and particularly relates to a design method of 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 enter 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 DVI3 signals to the display 1 and DVI4 signals to the display 2. When the console computer works normally, the display needs to output real-time working video images, at the moment, the DVI3 output signal and the DVI4 output signal are manually switched off, and the DVI1 output signal and the DVI2 output signal 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 outputs 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, when the DVI works normally and videos are played back, the DVI signal cable needs to be plugged and pulled frequently, and great inconvenience is brought to users. The second method also needs to adjust the layout on the original console mouse and 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 binary channels video admission device, solve "realize the inconvenient and not high problem of reliability of the synchronous video admission operation of two displays on the hardware basis of the existing control cabinet".
(II) technical scheme
In order to solve the technical problem, the invention provides a design method of a dual-channel video recording device, in the method, the device is designed to comprise video recording equipment and a console computer, wherein the console computer comprises two DVI screen splitters and 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 the checking result to the console computer through the Ethernet;
the video acquisition module is connected with the self-checking module and is used for acquiring two-channel DVI video 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 converting the video format of the two-channel DVI video signal acquired by the video acquisition module, generating and naming a video file, segmenting the video file and storing the video file;
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 control console computer, the two displays of the control console and the video recording equipment are powered on simultaneously, the control console computer outputs a first DVI video signal and a second DVI video signal, namely a DVI1 video signal and a DVI2 video signal, a first DVI screen splitter through which the DVI1 video signal passes is divided into 2 paths, the 1 path of DVI1 video signal is connected to the video recording equipment as an input signal, the other 1 path of DVI1 video signal is connected to a first KVM switcher, namely a KVM1 switcher, as an input, and the DVI1 video signal of the control console computer is output to the first display by operating the KVM1 switcher in the control console computer; dividing the DVI2 video signals into 2 paths through a second DVI screen splitter, connecting 1 path of DVI2 video signals as input signals to the video recording equipment, connecting the other 1 path of DVI2 video signals as input to a second KVM switcher, namely a KVM2 switcher, and outputting the second DVI video signals, namely the DVI2 video signals of the console computer to a second display by operating the KVM2 switcher in the console computer; after the video recording equipment is electrified, the two-channel DVI video signals output by the two displays of the console are automatically and synchronously acquired.
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 and displaying module in the video recording device; after each self-checking is finished, the self-checking module sends the self-checking result to the console computer through the Ethernet.
Preferably, after the video recording device is powered on, the video storage module automatically starts to synchronously store the two-channel DVI video signals output by the two displays of the console, names and stores the video files recorded by the two displays of the console respectively, firstly, the collected DVI video signals are compressed and encoded according to the h.264 standard, and then, the format of the video file is converted into the MP4 format and stored.
Preferably, the console computer sends the time of the console computer to the video recording device through the ethernet, so as to keep time synchronization of the two devices, 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 of the current system time is "xx minutes xx seconds when xx months xx days xx are xx in xx years", 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".
Preferably, when the video recording device receives a "start recording video" sent by any KVM switch, the video recording device newly generates two video files named in the current system time format, and stores the 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.
Preferably, when the size of a single stored video file is larger than 1000MB, the video recording device 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 video recording device is lower than a specified threshold value, the self-checking module sends an 'immediate standby' command 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 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 "video recording device", and outputs a third DVI output signal, i.e., a DVI3 video signal, output by the video recording device, to the first display via the first KVM switch, i.e., the KVM1 switch; meanwhile, the second KVM switch, i.e., the switch controller of the KVM2 switch, selects "video recording device", and outputs the fourth DVI video signal, i.e., the DVI4 video signal, output by the video recording device to the second display via the second KVM switch, i.e., the KVM2 switch, at this time, the contents displayed in the video recording devices are both displayed in the two displays.
Preferably, each KVM switch includes a switch controller, a video switch, and a mouse switch; the keyboard on the mouse and keyboard operation platform of the console is used as a switching controller of the KVM switcher, four groups of combination keys are arranged on the keyboard and respectively represent that a console computer outputs a first display, a console computer outputs a second display, a video recording device outputs a first display and a video recording device outputs a second display, when any combination key on the console mouse and keyboard operation platform is pressed down on the keyboard, a switching signal is sent to each KVM switcher, after the KVM switcher receives the switching control signal of the console computer outputting the first display, the mouse switching device of the KVM switcher outputs the mouse signal to the console computer, and the DVI signal of the console computer is output 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, and if the switching controller selects the video recording equipment, the KVM switcher sends a command of stopping recording the video to the video recording equipment; if the switch controller selects "Console computer", the KVM switch sends a "begin recording video" command to the video recording device.
The invention also provides a two-channel video recording device designed by the method.
(III) advantageous effects
The device does not need to destroy or adjust the layout on the mouse and keyboard operation platform of the original control console, does not need to frequently plug and unplug DVI signal cables during normal work and video playback, and realizes storage and synchronous playback of video signals output by two displays of the control console. 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, through integrating the DVI screen splitter in the video transmission cable, a VGA interface on the display is saved, and DVI video signals output by the console computer are directly accessed into the video recording equipment, so that the conversion from analog signals to digital signals is avoided, the video images output in real time and the video images recorded and played back have the same resolution and picture quality, the video files of the two recorded displays can be synchronously and quickly advanced, synchronously and quickly retreated or synchronously dragged to the same moment during playing, the complete synchronization of the playing of the two video files is ensured, the device has the abnormal power-off data protection function, and the subsequent expandable function of the capacity of a solid hard disk is supported; the problem of "realize the synchronous video admission operation of two displays on the basis of the hardware of current control cabinet inconvenient and the reliability is not high" is solved.
Drawings
FIG. 1 is a schematic diagram of a dual channel video recording device according to the present invention;
FIG. 2 is a schematic diagram of a dual-channel video recording apparatus according to the present invention;
FIG. 3 is a schematic diagram of a two-channel video recorder KVM switch according to the present invention;
fig. 4 is a general flowchart of the operation 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 more apparent, the following detailed description of the present invention will be made in conjunction with the accompanying drawings and examples.
Fig. 1 is a schematic connection diagram of a dual-channel video recording apparatus according to the present invention, which includes a video recording device, a console computer, and the console computer includes two DVI splitter and two KVM switches; the device can gather and save the DVI video signal of two display outputs simultaneously, utilizes DVI to divide the screen ware with the DVI video signal direct access video admission equipment of control cabinet computer output to realized the real-time demonstration of content in control cabinet computer or the video admission equipment on two displays and video playback through the KVM switch. The device can realize complete recording and synchronous playback of the output videos of the two displays under the condition that the normal output of the working video images of the console is not influenced. The device is designed to have a video recording function newly added on the basis of original console hardware, and the layout on an original console mouse and 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 DVI video 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 used for converting the video format of the two-channel DVI video signals acquired by the video acquisition module, generating and naming a video file, segmenting the video file and storing the video file;
and the video playing and displaying module 14 is connected with the video storage module 13 and is used for playing the video file stored in the video storage module and displaying the playing content in a specified display.
The working state check comprises power-on initialization self-check and power-on periodic self-check, and the self-check 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 and displaying module in the video recording equipment; after each self-checking is finished, the self-checking module sends the self-checking result to the console computer through the Ethernet.
The control console computer, two displays and video admission apparatus of the control console are electrified at the same time, the control console computer outputs the first, second DVI video signal, namely DVI1 video signal and DVI2 video signal, divide DVI1 video signal into 2 routes through "DVI1 divides the first DVI of 2" and divides the screen, 1 route of first DVI video signal namely DVI1 video signal is regarded as the input signal and connected to the video admission apparatus, another 1 route of first DVI video signal namely DVI1 video signal is regarded as the input and connected to the first KVM switcher namely KVM1 switcher as the input, through operating the first KVM switcher namely KVM1 switcher in the control console computer, the first DVI video signal namely DVI1 video signal of the control console computer is outputted to the first display namely display 1; dividing a second DVI video signal, namely a DVI2 video signal into 2 paths through a second DVI screen splitter of 'DVI 1-to-2', connecting 1 path of the second DVI video signal, namely the DVI2 video signal as an input signal to a video recording device, connecting the other 1 path of the second DVI video signal, namely the DVI2 video signal as an input to a second KVM switcher, namely a KVM2 switcher, and outputting the second DVI video signal, namely the DVI2 video signal of the console computer to a second display, namely the display 2 by operating the second KVM switcher, namely the KVM2 switcher in the console computer; after the video recording equipment is powered on, the two-channel DVI video signals output by the two displays of the console are automatically and synchronously acquired. 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 DVI video signals output by the two displays of the console, video files recorded by the two displays of the console are named and stored respectively, the collected DVI video 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 control console computer sends the time of the control console computer to the video recording device through the Ethernet, the time synchronization of the two devices 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 month xx day xx time xx minutes xx seconds', 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 any KVM switcher, the video recording equipment newly generates two video files named according to the current system time format, and stores the video signals which are collected 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), the video recording device 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%.
If the console computer is abnormally powered off at the time of T0 (T0 is more than 10 s), the video recording equipment 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 the abnormal power off occurs, the self-checking module monitors that the working voltage of the video recording equipment is lower than a specified threshold value, the self-checking module sends an 'immediate standby' command 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 records comprise 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, a software internal operation log, a running log, a window display log, a closing log and a software starting loading log; the Log record is realized in the form of disk file storage, and the 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 video signal output by the video recording device to the first display, namely the display 1, through the first KVM switch, namely the KVM1 switch; meanwhile, the second KVM switch, i.e., the switch controller of the KVM2 switch, selects "video recording device", and outputs the fourth DVI video signal, i.e., the DVI4 video signal, output by the video recording device, to the second display, i.e., the display 2, via the second KVM switch, i.e., the KVM2 switch, at this time, both displays are contents in the video recording device.
The schematic diagram of a two-channel video recorder KVM switch is shown in FIG. 3, each KVM switch comprises a switch controller, a video switch and a mouse switch; a keyboard on a mouse and keyboard operation platform of a console is used as a switching controller of a KVM (keyboard video mouse) switcher, four groups of combination keys are arranged on the keyboard and respectively represent a console computer output display 1, a console computer output display 2, a video recording device output display 1 and a video recording device output display 2, when any one of the combination keys is pressed on the keyboard of the console mouse and keyboard operation platform, a switching signal is sent to each KVM switcher, and after the KVM switcher receives the switching control signal of the console computer output display 1, the mouse switching device of the KVM switcher outputs the mouse signal to the console computer and outputs a DVI (digital visual interface) signal of the console computer to the display 1 through the video switching device of the KVM switcher; 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 a mouse signal to the video recording equipment by a mouse switching device of the KVM switcher, and outputs a DVI signal of the video recording equipment to the display 2 by the video switching device of the KVM switcher, if the switching controller selects the video recording equipment, the KVM switcher sends a command of stopping recording videos to the video recording equipment; if the switch controller selects "Console computer", the KVM switch sends a "begin recording video" command to the video recording device.
All video files recorded by the video recording equipment can be checked through the two displays, the video files to be played are selected through the mouse, and the two players are opened to play the video files at the same time.
And the two players respectively display the contents of the two video files and synchronously play the contents of the two video files. And the video playing and displaying 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 exited after the video is played, the switching controller of the first KVM switch, namely the KVM1 switch, selects the console computer, and outputs the DVI1 video signal of the console computer to the first display, namely the display 1, through the first KVM switch, namely the KVM1 switch; meanwhile, the switch controller of the second KVM switch, i.e., the KVM2 switch, selects "console computer", and outputs the second DVI video signal, i.e., the DVI2 video signal of the console computer to the second display, i.e., the display 2, via the second KVM switch, i.e., the KVM2 switch. The video recording device starts to re-collect and store the two-channel DVI 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 control 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 ensures that the video images output in real time and the video images recorded and played back have the same resolution and picture quality. 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 in the method, the device is designed to comprise video recording equipment and a console computer, wherein the console computer comprises two DVI screen splitters and 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 the checking result to the console computer through the Ethernet;
the video acquisition module is connected with the self-checking module and is used for acquiring two-channel DVI video 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 converting the video format of the two-channel DVI video signal acquired by the video acquisition module, generating and naming a video file, segmenting the video file and storing the video file;
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 control console computer, the two displays of the control console and the video recording equipment are powered on simultaneously, the control console computer outputs a first DVI video signal and a second DVI video signal, namely a DVI1 video signal and a DVI2 video signal, a first DVI screen splitter through which the DVI1 video signal passes is divided into 2 paths, the 1 path of DVI1 video signal is connected to the video recording equipment as an input signal, the other 1 path of DVI1 video signal is connected to a first KVM switcher, namely a KVM1 switcher, as an input, and the DVI1 video signal of the control console computer is output to the first display by operating the KVM1 switcher in the control console computer; dividing the DVI2 video signals into 2 paths through a second DVI screen splitter, connecting 1 path of DVI2 video signals as input signals to the video recording equipment, connecting the other 1 path of DVI2 video signals as input to a second KVM switcher, namely a KVM2 switcher, and outputting the second DVI video signals, namely the DVI2 video signals of the console computer to a second display by operating the KVM2 switcher in the console computer; after the video recording equipment is electrified, the two-channel DVI video signals output by the two displays of the console are automatically and synchronously acquired.
2. The method according to claim 1, wherein the working state check includes power-on initialization self-check and power-on periodic self-check, and the self-check contents include 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; after each self-checking is finished, the self-checking module sends the self-checking result to the console computer through the Ethernet.
3. The method of claim 1, wherein the video storage module automatically starts to synchronously store the two-channel DVI video signals output by the two displays of the console after the video recording device is powered on, the video files recorded by the two displays of the console are named and stored respectively, the collected DVI video 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.
4. 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".
5. The method according to claim 1, wherein when the video recording device receives the "start recording video" sent by any KVM switch, the video recording device newly generates two video files named in the format of the current system time, and stores the 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.
6. The method of claim 1, wherein when the size of a single stored video file is greater than 1000MB, the video recording device automatically generates a new video file named after the current system time and enables a cyclic storage of the video file by: 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%.
7. 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, when abnormal power off occurs, the self-checking module monitors that the operating voltage of the video recording device is lower than a specified threshold, the self-checking module 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 all data in the receiving buffer area are written into the nonvolatile NAND cell.
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 switch controller of the first KVM switch, i.e., KVM1 switch, selects "video recorder" and outputs a third DVI output signal, i.e., DVI3 video signal, output by the video recorder to the first display via the first KVM switch, i.e., KVM1 switch; meanwhile, the second KVM switch, i.e., the switch controller of the KVM2 switch, selects "video recording device", and outputs the fourth DVI video signal, i.e., the DVI4 video signal, output by the video recording device to the second display via the second KVM switch, i.e., the KVM2 switch, at this time, the contents displayed in the video recording devices are both displayed in the two displays.
9. The method of claim 1, wherein each KVM switch comprises a switch controller, a video switch, and a mouse switch; the method comprises the following steps that a keyboard on a mouse and keyboard operation platform of a console serves as a switching controller of a KVM (keyboard video mouse) switcher, four groups of combination keys are arranged on the keyboard and respectively represent that a console computer outputs a first display, a console computer outputs a second display, a video recording device outputs a first display and a video recording device outputs a second display, when any combination key on the keyboard of the console mouse and keyboard operation platform is pressed down, a switching signal is sent to each KVM switcher, after the KVM switcher receives the switching control signal of the console computer outputting the first display, the mouse switching device of the KVM switcher outputs the mouse signal to the console computer, and the DVI signal of the console computer is output 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, and if the switching controller selects the video recording equipment, the KVM switcher sends a command of stopping recording the video to the video recording equipment; if the switch controller selects "Console computer", the KVM switch sends a "begin recording video" command to the video recording device.
10. A dual channel video recording device designed using the method of any one of claims 1 to 9.
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