A kind of dvr multi-channel audio and video recording method

Abstract

The invention discloses a DVR multipath audio and video recording method. The method comprises the steps of collecting and buffering all the input audio data sections to an audio data buffer area, collecting and compressing a part of input video frame compression data into a video data buffer area, periodically checking whether data exist in the buffer areas in a timing mode, and reading the data of the buffer areas to a storage card. The method is quite suitable of application of DVR multipath audio and video record large in video frame rate fluctuation range, is wide in frame rate fluctuation range, and can reach 80% in fluctuation range, namely, video still can maintain a good time synchronous effect when being changed into 6frames / second from original preset 30frames / second in frame rate.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of multimedia information processing. [0003] Background technique: [0004] With the development of solid-state storage technology and video compression technology, DVR equipment has replaced the traditional tape audio and video recording method by digital recording method, and has significantly improved in volume, weight and environmental adaptability. The data recorded by the digital DVR is mainly one to two channels of audio data, and multiple channels (usually more than three channels) of video data. Its working principle is roughly as follows: After collecting and compressing the input audio and video signals, the main control program buffers the data locally and writes it to the specified file on the solid-state memory. The main processing structure of airborne digital DVR is as follows: figure 1 As shown, it consists of one or more audio and video compression modules, a control management m...

AI Technical Summary

Problems solved by technology

[0007] However, for non-professional DVR application products with multi-channel audio and video on board, it is not suitable to use overly complicated hardware for implementation due to the limitations of application conditions such as power consumption, volume, and weight of the equipment.

The multi-channel video it faces is not controlled by the DVR in terms of the timing of the input signal, which are generated by different video input devices and are independent of each other. There is inevitably a timing deviation between them, and These deviations are constantly changing due to the influence of DVR processing on frame rate fluctuations. If independent time stamp information is used for each video, it is very difficult to strictly restore the timing of these videos during recording and playback. DVR equipment is required The processor on the control management module must provide a clock function service function or have a considerable number of timer functions, which are generally difficult to satisfy for common embedded processors, because most of the processors of the control management module lack clock function services, and The number of timers does not exceed three, and these resources cannot be fully allocated to video acquisition and processing.

In addition, during the playback process, due to the limitation of the reading and writing speed and sequential reading and writing of the disk video file data by the video playback ground station, it is also difficult to realize the simultaneous decoding and display of multiple channels of video in strict accordance with the independent multi-time sequence timestamps of each channel.

Images