CN113409831B - Video covering method of vehicle-mounted video recorder based on virtual timestamp chain - Google Patents
Video covering method of vehicle-mounted video recorder based on virtual timestamp chain Download PDFInfo
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- CN113409831B CN113409831B CN202110597521.XA CN202110597521A CN113409831B CN 113409831 B CN113409831 B CN 113409831B CN 202110597521 A CN202110597521 A CN 202110597521A CN 113409831 B CN113409831 B CN 113409831B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/10537—Audio or video recording
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Abstract
The invention discloses a video covering method of a vehicle-mounted video recorder based on a virtual timestamp chain, which comprises the steps of establishing a virtual timestamp chain table for recording video file timestamp information in a disk directory, comparing the maximum timestamp of the virtual timestamp chain table with the current system time when video equipment is recovered abnormally, adding a preset time value to the maximum timestamp of the virtual timestamp chain table to serve as the initial timestamp of new video file timestamp information if the maximum timestamp of the virtual timestamp chain table is larger than the current system time, and covering an old video file according to the timestamp time sequence of the virtual timestamp chain table when the disk video file is fully stored. The video covering method of the vehicle-mounted video recorder based on the virtual timestamp chain can effectively avoid the problem that the timestamp of the video file in the disk is disordered due to the fact that the RTC of the system is abnormal or the system time is intentionally tampered, so that the newly written video file is mistakenly taken as the oldest video to be covered.
Description
Technical Field
The invention relates to the technical field of flash electronic type external storage vehicle-mounted video recorder videos of a data processing system, in particular to a virtual timestamp chain-based vehicle-mounted video recorder video covering method.
Background
In the field of vehicle monitoring, vehicle-mounted video is generally required, the capacity of a disk for storing the video is limited, and after the disk is fully stored, the video needs to be overwritten, namely, a relatively old (time dimension) video file in the disk is deleted and a new video file is written to ensure the continuity of the video. The traditional management method for video storage is based on time dimension management, and the covering strategy is to cover according to the time dimension, namely, to cover the oldest video file in the disk and write a new video file. Therefore, if the RTC of the system is abnormal or the system time is intentionally tampered, the timestamp of the video file in the disk can be disturbed, so that the newly written video file is mistakenly taken as the oldest video to be covered, the continuity of the video covering is greatly damaged, the important evidence video can be mistakenly covered, and the like.
Disclosure of Invention
The invention aims to provide a video covering method of a vehicle-mounted video recorder based on a virtual time stamp chain, which prevents a newly written video file from being covered as the oldest video.
The invention discloses a video covering method of a vehicle-mounted video recorder based on a virtual timestamp chain, which comprises the following steps:
creating a virtual time stamp linked list for recording the time stamp information of the video file in a disk directory;
when the video equipment is recovered abnormally, comparing the maximum timestamp of the virtual timestamp linked list with the current system time;
if the maximum timestamp of the virtual timestamp linked list is larger than the current system time, adding a preset time value to the maximum timestamp of the virtual timestamp linked list to serve as an initial timestamp of the timestamp information of the new video file;
and when the storage of the disk video files is full, covering the old video files according to the time sequence of the time stamps of the virtual time stamp linked list.
The invention relates to a video covering method of a vehicle-mounted video recorder based on a virtual timestamp chain, which comprises the steps of establishing a virtual timestamp chain table for recording video file timestamp information in a disk directory, comparing the maximum timestamp of the virtual timestamp chain table with the current system time when video equipment recovers abnormally, adding a preset time value to the maximum timestamp of the virtual timestamp chain table to serve as the initial timestamp of new video file timestamp information if the maximum timestamp of the virtual timestamp chain table is larger than the current system time, covering an old video file according to the timestamp time sequence of the virtual timestamp chain table when the storage of the video file of the disk is full, and effectively avoiding the time stamp disorder of the video file in the disk caused by the RTC abnormality of the system or the intentional tampering of the system time, thereby mistakenly taking a newly written video file as the oldest covering problem.
Drawings
FIG. 1 is a schematic flow chart diagram of a video coverage method of a vehicle-mounted video recorder based on a virtual timestamp chain according to the present invention;
FIG. 2 is a schematic diagram of an actual timestamp linked list of the present invention;
FIG. 3 is a schematic diagram of a virtual timestamp chain table according to the present invention.
Detailed Description
As shown in fig. 1, a method for overlaying video of a vehicle-mounted video recorder based on a virtual timestamp chain includes:
creating a virtual time stamp linked list for recording the time stamp information of the video file in a disk directory;
when the video equipment is recovered abnormally, comparing the maximum timestamp of the virtual timestamp linked list with the current system time;
if the maximum timestamp of the virtual timestamp linked list is larger than the current system time, adding a preset time value to the maximum timestamp of the virtual timestamp linked list to serve as an initial timestamp of the timestamp information of the new video file;
and when the storage of the disk video files is full, covering the old video files according to the time sequence of the time stamps of the virtual time stamp linked list.
And creating an actual time stamp linked list for recording the time stamp information of the video file in a disk directory. And when the video equipment is recovered abnormally, the recovered default system time is used as the initial timestamp of the timestamp information of the new video file in the recovery process. The virtual timestamp linked list is combined with the timestamp chains of the disk video files of the actual timestamp linked list, so that each video file has both a virtual timestamp and an actual timestamp, and the video coverage continuity and the integrity of time information are ensured. Moreover, the virtual timestamp linked list and the actual timestamp linked list are also greatly convenient for the client to visually look up the video time distribution information and the abnormal information.
Further comprising: and when the video equipment is recovered abnormally, time correction is carried out on the virtual time stamp linked list and the actual time stamp linked list. The time correction of the virtual time stamp linked list and the actual time stamp linked list comprises: and correcting the delay time of the virtual timestamp linked list and the actual timestamp linked list when the video equipment is abnormally recovered. The time stamps of the corrected virtual time stamp linked list and the actual time stamp linked list are equal to the time difference of the time stamp of the abnormal time stamp interval plus the delay time. The video equipment abnormality comprises an abnormality in a GPS or network environment. Set up the calibration function of the time under GPS or the network environment through video recording equipment, because equipment boot initial stage and equipment GPS or network environment do not well lead to appearing time correction delay in service, during this delay, the time stamp on the time stamp chain is unusual, wait after correcting successfully, on the basis of virtual time stamp chain, through the method of backward motion, can deduce the time difference of unusual time stamp and normal time stamp, then rectify the unusual time stamp in the linked list, the time stamp after the correction equals the time difference of time stamp plus delay time between unusual time stamp interval, thereby can revise unusual time stamp to a certain extent, ensure timestamp furthest's accuracy.
The specific example that a new video file is deleted by mistake due to the abnormality of the system RTC is avoided through the virtual timestamp linked list:
as shown in fig. 2, the physical time of FILE3 in the actual timestamp linked list is the latest, but due to the system time being abnormal, the system time provided by the device is the oldest, and if the disk is full at this time and the video FILE with the oldest time needs to be deleted first, the system deletes FILE3, thereby deleting the latest video FILE.
The maximum timestamp of the virtual timestamp linked list is compared with the current system time, if the maximum timestamp of the virtual timestamp linked list is larger than the current system time, a preset time value is added to the maximum timestamp of the virtual timestamp linked list to serve as a starting timestamp of new video FILE timestamp information, when the storage of the disk video FILEs is full, an automatic time repair mechanism for covering old video FILEs is carried out according to the timestamp time sequence of the virtual timestamp linked list, for example, the maximum timestamp in the virtual timestamp linked list is 2021-03-31-08-03-01 shown in fig. 3, the system time is 1970-01-0100-01-01, the maximum timestamp in the virtual timestamp linked list is larger than the system time, at the moment, the preset time value of the maximum timestamp of the virtual timestamp is added to a preset time value of 15 seconds, namely, the starting timestamp of FILE3, the preset time value can be configured according with the situation, if the disk is full, the FILE with the oldest timestamp needs to be deleted, then the system time can be deleted 1, the system can delete the maximum timestamp of the virtual timestamp linked list, the old FILE, the effective recording mechanism can completely track the problem of the old video FILE when the virtual timestamp linked list is deleted, and the recording system node is completely abnormal, and the problem of the recording of the virtual timestamp can be observed through an actual recording node.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (2)
1. A video covering method of a vehicle-mounted video recorder based on a virtual timestamp chain is characterized by comprising the following steps:
creating a virtual time stamp linked list for recording the time stamp information of the video file in a disk directory;
when the video equipment is recovered abnormally, comparing the maximum timestamp of the virtual timestamp linked list with the current system time;
if the maximum timestamp of the virtual timestamp linked list is larger than the current system time, adding a preset time value to the maximum timestamp of the virtual timestamp linked list to serve as an initial timestamp of the timestamp information of the new video file;
when the storage of the disk video file is full, the old video file is covered according to the time sequence of the timestamps of the virtual timestamp linked list;
further comprising: creating an actual time stamp linked list for recording the time stamp information of the video file in a disk directory;
when the video equipment is recovered abnormally, the recovered default system time is used as the initial timestamp of the timestamp information of the new video file;
further comprising: when the video equipment is recovered abnormally, time correction is carried out on the virtual timestamp linked list and the actual timestamp linked list;
the time correction of the virtual time stamp linked list and the actual time stamp linked list comprises: correcting the delay time of the virtual timestamp linked list and the actual timestamp linked list when the video equipment is abnormally recovered;
and the time stamps of the corrected virtual time stamp linked list and the actual time stamp linked list are equal to the time difference of the time stamp of the abnormal time stamp interval plus the delay time.
2. The method as claimed in claim 1, wherein the video equipment abnormality includes GPS or abnormality in network environment.
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| CN202110597521.XA CN113409831B (en) | 2021-05-31 | 2021-05-31 | Video covering method of vehicle-mounted video recorder based on virtual timestamp chain |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102253638A (en) * | 2011-08-12 | 2011-11-23 | 北京电子工程总体研究所 | Frequency stability control and compensation method for automatically keeping time in complex environment |
| TW201347521A (en) * | 2012-05-11 | 2013-11-16 | Hon Hai Prec Ind Co Ltd | System and method for adjusting timestamps |
| CN103426448A (en) * | 2012-05-14 | 2013-12-04 | 鸿富锦精密工业（深圳）有限公司 | System and method for adjusting timestamps |
| CN109677467B (en) * | 2019-02-26 | 2021-08-06 | 中车长春轨道客车股份有限公司 | Unified time service method, device and system based on TCMS |
| CN112579820B (en) * | 2019-09-27 | 2023-03-24 | 浙江宇视科技有限公司 | Time hopping video data processing method, device, medium and electronic equipment |
| CN111797060B (en) * | 2020-09-07 | 2020-12-04 | 杭州觅睿科技有限公司 | Offline video recording method, device and equipment and computer readable storage medium |
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Address after: 101, Building 6, No.1 Ruihua Road, Tianhe District, Guangzhou, Guangdong 510660 Patentee after: SHARPVISION CO.,LTD. Address before: 510000 fifth floor, No.3, Huangzhou Industrial Park, chebei Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: SHARPVISION CO.,LTD. |