说明：  这是一个linux下的视频采集编程，这是从linuxtv官网的一个视频采集的例子，基于v4l2标准采集，在linux下编译后就可以直接运行了。
(This is a video capture program under linux, this is an example of a video the official website of the acquisition linuxtv based v4l2 standard collection, compiled in linux can run directly after.)