用v4l2从摄像头采集MJPEG视频，然后解压缩，最后用SDL来播放视频。-MJPEG video acquisition from a webcam using v4l2 and then decompress the last to play the video using SDL.

跟摄像头连接，并读取和分析MJPEG流，使用SDL显示-Read and process a MJPEG stream using C++