对摄像头视频捕捉的截图，保存成一帧一帧的图片，在ubuntu Linux下编译通过，采用ffmpeg开发。-Save a picture of a camera, video capture screenshots, compiled by ubuntuLinux next, using ffmpeg development.

ubuntu环境下c-c++程序，利用v4l2驱动采集usb摄像头视频并通过QT4界面显示出来，是学习v4l2视频采集和QT4的好例子-a usb video capture example with README help inside under ubuntu12.04LTS,it can be used to study v4l2 video and qt4 program