Qt Creator 开发opencv 纯 C++程序

一般情况下工程配置如下：

INCLUDEPATH += /usr/local/include/opencv
LIBS += `pkg-config opencv --libs`

但如果出现各种有关undefined reference to `av_XXXX'的问题，尝试加一句

LIBS+=-L/usr/local/lib\

-lavutil
即：

INCLUDEPATH+=/usr/local/include/opencv
LIBS+=`pkg-configopencv--libs`
LIBS+=-L/usr/local/lib\
-lavutil