int argc=1, width=640, height=480, fps=5, format=V4L2_PIX_FMT_MJPEG,i; 可知默认设备 /dev/video0,默认格式V4L2_PIX_FMT_MJPEG 从 /* y, yuv */ case 8: case 9: DBG("case 8,9\n"); format = V4L2_PIX_FMT_YUYV; break; 可知指定 -y后格式是V4L2_PIX_FMT_YUYV 线程函数cam_thread中...