cmake编译opencv3.2过程中需要手动下载的文件，包括：ippicv_windows_20151201.zip；opencv_ffmpeg.dll；opencv_ffmpeg_64.dll 下载后将 opencv3.2.0\opencv\sources\3rdparty\ippicv\downloads\windows-04e81ce5d0e329c3fbc606ae32cad44d\ippicv_windows_20151201.zip；\opencv3.2.0\opencv\sources\3rdparty\ffmpeg\downloads\a423363a6eb76d362c