Method and device for multi-channel video condensation

Abstract

The invention discloses a method and a device for multi-channel video condensation. The method comprises the steps that a host process acquires input to-be-condensed video file identification information, and dynamically adjusts a starting way of a condensed subprocess according to the central processing unit (CPU) performances of a current computer system; the host process sends a video condensation command with the to-be-condensed video file identification information to the started condensed subprocess; and the condensed subprocess opens a corresponding to-be-condensed video file according to the command, and selects a corresponding video condensation algorithm according to the type of the to-be-condensed video file so as to carry out video condensation. Due to adoption of a multiprocess method, the number of condensed video files in unit time is increased. Through synchronous processing by the multiprocess, the CPU computing capacity of the computer system is effectively used and the internal storage use efficiency of the computer system is also improved, so that video condensation efficiency and performance use ratio of the computer system are improved.

Description

technical field [0001] The present invention relates to the technical field of video surveillance, in particular, to a multi-channel video concentration processing method and device thereof, which performs multi-process concentration processing of multi-channel video data, and is suitable for applications where a large number of video files need to be concentrated scene. Background technique [0002] Usually, a video surveillance system needs to collect a large number of video files in practical applications. And usually people are only interested in part of the target (for example, moving target) and content in the video file, so when people are reviewing or browsing these video files, they hope that they can quickly obtain a section of longer video files that they are interested in. content, and video enrichment technologies aim to address this. The so-called video enrichment refers to the technology and method of arranging the target in a shorter video to present to the...

AI Technical Summary

Problems solved by technology

However, there is such a problem: assuming that the size of the video files to be concentrated is the same, if there are several video files, the time required for video concentration is several times that of a single file, so that the processing time of video concentration is relatively prolonged. , in addition, adopt this single-thread concentration processing method, because the video data adopts serial concentration processing, so that the CPU and memory capacity of the computer can not be effectively utilized, so this method is a kind of extremely low efficiency. , and waste computer performance

Obviously, multi-threading is more efficient than single-threading, but there are still shortcomings: For example, for a 32-bit Windows system, the available virtual memory space for a single process is 2^32 bytes (4GB), while the actual There is only 2G for user space (the remaining 2G is reserved for the operating system)

The size of a frame of true-color D1 image is about 1.2M. Assuming that each channel of video memory caches 1000 frames of video during video enrichment, the memory space occupied by each sub-thread participating in the enrichment process is 1.2G, so it can be opened in the main process. The number of sub-threads is relatively limited, and even if the number of video condensed cache frames is reduced, the improvement of video condensed processing efficiency is limited

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