Hard disc video recording and retrieval method for analog magnetic tape serial schema

Abstract

The invention relates to a method for recording and searching hard disk video having analog tape serial mode, which is characterized in that the method comprises the process of establishing disk track files in advance, video tape data buffering serial write procedure, token management process ensuring preferential writing and process of quickly searching and reading video tape data. The method has the advantages that 1) a disk preallocation mode is used for solving the problem of disk defragment generated by establishing and deleting files temporarily, so that the service life of the disk is prolonged. 2) As the operation of establishing and deleting files is not involved in the processing of using the disk, the probability of damaging the disk can be greatly reduced in certain extreme cases. 3) Data buffering technology, serial writing technology and track file technology are used for decreasing the operating times of the disk and the moving frequency of a magnetic head to the utmost extent, reducing the heat rise of the disk and prolonging the service life of the disk. 4) By adopting the token technology, the method better adapts to the requirements for ensuring the normal work of the video tape in the application of video surveillance.

Description

technical field [0001] The invention relates to a method for continuously recording and managing video files on an ordinary hard disk, in particular to a method for recording and retrieving hard disk video in an analog tape serial mode. Background technique [0002] At present, video monitoring has changed from analog to digital, and the recording carrier has also changed from magnetic tape to magnetic disk. The video file management method is as follows: first format the hard disk and create partitions, and store the data of a fixed period of time (such as 30 minutes) as a file when video recording starts. That is, a new file is created when a channel starts recording, and the compressed audio and video data is continuously written into the file. Due to different monitoring scenarios, the length of the data file with the same recording time is generally different; when the disk is full, if there is no In addition, when the available empty disk needs to continue recording, ...

AI Technical Summary

Problems solved by technology

Traditional video recording systems need to defragment the disk from time to time, which is very important to optimize system performance, but defragmenting the disk is a time-consuming and laborious task, which has a lot of side effects on the life of the disk, and the disk defragmentation work will also Affect the normal video recording work

Excessive disk fragmentation will not only cause the system to keep searching back and forth when reading and writing files, which will cause system performance degradation (this is because the read and write operations to the disk include the following three steps: seek, read and write data, and the data is stored on the disk. Post-processing / pre-processing of cache and in-memory transmission, because the seek time caused by the mechanical movement of the magnetic head greatly affects the read and write efficiency of the file, so the time required for disk reading and writing to place a sector of data under the magnetic head It is only one-fifth of the time required to move the magnetic head to another track and then read and write the same data), and in severe cases, it may even cause the system to overload during the process of deleting and creating files, and it is too late to record new audio and video data, resulting in Loss of video data and shortened disk life

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