这是从v4l2-utils里提取出来的，交叉编译到海思3518E上的 适用于其他平台。
this program is outof v4l2-util,which is so heavy and buggy.hard to compile on cross platform.
I cut it down from it.
build: just change the build.sh change the toolchain to your own.
if it helps you,pls give me a star~
By 9crk
2017-09-22 ps:the day my baby is going to born! :-)
in ShenZhen.China