change in cap_ffmpeg_impl.hpp

edit

Hi, I changed the timeout value in the "videoio/src/cap_ffmpeg_impl.hpp". I am rebuilding opencv using cmake on windows for qt/mingw. However the change I made doesnt effect anything. I am unplugging my ip cam, but after 30secs I can get timeout signal as if my replacement doesnt work. Am I compiling in the wrong manner? or how? Thanks