基于RTP的机载网络视频同步回放技术

在飞行试验中,机载视频数据是试飞测试数据中的重要组成部分。为了解决多路机载网络视频数据同步回放的问题,提出了基于RTP/RTCP协议的机载多路网络视频数据同步回放方案。采用网络视频数据分流和预处理机制,首先通过对数据包进行识别,从机载记录的数据进行分流提取出网络视频数据包,然后经过对RTP封装的H.264视频数据进行解包、时间计算等处理后,利用FFmpeg良好的解码能力对一帧图像进行解码,利用SDL优异的视频性能显示YUV数据,采用基于时间戳同步机制实现多路机载网络视频的快速同步回放。软件采用模块化和多线程设计思路,提高处理效率,保证功能的可扩展性。目前该系统已成功应用于多路机载网络视频同步回放中,实际应用效果表明,该系统工作稳定,能够有效提高型号试飞效率。

Synch-playback Technology of Airborne Network Video Based on RTP

In flight test,airborne video data is an important part of flight test data. In order to solve the problem of the synch-playback of multi-channel airborne network videos,a synch-playback scheme of multi-channel airborne network videos based on RTP/RTCP is proposed. By using the mechanism of network video data diversion and preprocessing,the network video data packet is extracted from the airborne recorded data by identifying the data packet firstly. Then the H.264 video data encapsulated in RTP is processed such as unpacking and time calculation,a frame image is decoded with the excellent decoding ability of FFmpeg. YUV data is displayed by using excellent video performance of SDL. The timestamp synchronization mechanism is used to fast replay of multi-channel airborne network video. The modular and multi-threaded ideas are used in the software design to improve processing efficiency and ensure scalability of function. At present,the software has been successfully applied to synch-playback of multi-channel airborne network videos of multiple types’ task. The practical application shows that the system works steadily and can effectively improve the efficiency of flight test.