[ WARN:0] global /io/opencv/modules/videoio/src/cap_v4l.cpp (887) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
Cannot open camera
解决方法:将摄像头连接至虚拟机
[ WARN:0] global /io/opencv/modules/videoio/src/cap_v4l.cpp (998) tryIoctl VIDEOIO(V4L2:/dev/video0): select() timeout.
read video error
解决方法:usb兼容性选USB3.1