基于FFmpeg的音视频流封装技术在交通事故中的应用

Application of FFmpeg-based Audio and Video Stream Encapsulation Technology in Traffic Accidents

汽车行驶记录仪是对车辆行驶速度、时间、位置等数据以及音视频数据进行记录、存储,并可通过数据通信实现数据输出的数字式电子记录装置。交通事故中行车记录仪在车辆碰撞瞬间断电后会导致最后一段录制的视频未正常封装而不能播放,这时修复该段损坏的视频对整体碰撞事故的认定显得尤为重要。本文基于FFmpeg的音视频流封装技术和底层分析技术,针对行车记录仪外力碰撞断电产生的未能封装的音视频流碎片,对其进行提取和封装,可以及时还原事故现场实时画面,为交通事故的责任认定提供有力支撑。本文以行车记录仪常用的H.264视频编码和AAC音频编码为例,重点阐述FFmpeg的音视频流封装技术在交通事故中的应用。

The car driving recorder is a digital electronic recording device that records and stores data such as vehicle driving speed,time,location and audio and video data,and can realize data output through data communication.In a traffic accident,the dashcam will be powered off at the moment of vehicle collision,which will cause the last recorded video to be not properly packaged and cannot be played,and it is particularly important to repair the damaged video to determine the overall collision accident.Based on FFmpeg's audio and video stream packaging technology and underlying analysis technology,this paper extracts and encapsulates the unpackaged audio and video stream fragments caused by the collision and power failure of the driving recorder,which can restore the real-time picture of the accident scene in time,and provide strong support for the determination of responsibility for traffic accidents.This article takes H.264 video encoding and AAC audio encoding commonly used in driving recorders as examples,focusing on the application of FFmpeg's audio and video stream encapsulation technology in traffic accidents.