Abnormal power-off playable video method of a traffic recorder based on an Android structure

Abstract

The invention discloses an abnormal power-off playable video method of a traffic recorder based on an Android structure, which comprises the following steps: creating an Android class object used forrecording a video container; creating a file handle in the Android class object, and starting to record; calling the driver code through the platform HAL layer by an Android's camera service component, driving to access the hardware firmware to obtain the video stream, and transmitting the video stream to the multimedia codec component, reading the compressed code stream by the component that encapsulates and writes the recording file, and performing MP4 format encapsulation; When the recording is stopped or the condition that the recording is finished is triggered, completing encapsulation, and forming the MP4 video file. According to the MP4 encapsulation principle, as long as the corresponding moov encapsulation is written after each time slice is written to the TF card, the corresponding moov encapsulation is written. Video is encapsulated in time slices by software to solve the problem that the video can not be played because of abnormal power-down of the recorder. It also avoidsextending new video encapsulation formats and increases the workload associated with changes to the Android framework.

Description

technical field [0001] The invention relates to the technical field of video recording and video, in particular to a method for playing videos based on abnormal power failure of a driving recorder based on Android architecture. Background technique [0002] With the rise of the concept of Internet of Vehicles and the accumulation of technology, more and more smart devices are connected to vehicles. As a very important form of vehicle equipment, driving recorder is more and more accepted by car owners. [0003] In recent years, with the rise of intelligent systems, the recorder system has also switched from Linux to Android system, forming a smart driving recorder. The video recording function must be based on the Android Camera and Stagefright architecture. The image data obtained from the camera is compressed by the encoder. The code stream is finally encapsulated to form a playable video format. Since the recording needs to be written in real time after the recording sta...

AI Technical Summary

Problems solved by technology

However, when the recorder takes power from the cigarette lighter, after the normal vehicle is turned off, the final video cannot be packaged in time, so the video cannot be played

At present, to solve the problem that the video cannot be played when the recorder is abnormally powered off, it is necessary to find a way to leave a little power on the hardware, such as designing the device with a large capacitor or placing a small battery, etc., to ensure that after the flame is turned off, a few seconds are reserved for recording. The final packaging process ensures the integrity of the video, but its hardware cost is high. More importantly, when the vehicle is exposed to the sun, the ambient temperature can reach above 70°C. When the battery is used, the accelerated aging of the battery will bring certain safety hazards.

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