HIGHGUI ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV

 解决办法：

export LD_PRELOAD=/usr/lib/arm-linux-gnueabihf/libv4l/v4l1compat.so

注意路径不一定是上面这个路径。

自己在/usr/lib下,find -name v4l1compat.so,来确定路径