OpenCV Cmake 編譯遇到的問題記錄

CMake Error at cmake/OpenCVUtils.cmake:76 (if):
if given arguments:

"E:/C++" "MATCHES" "^E:/C++/Opencv 3.0/opencv/sources" "OR" "E:/C++" "MATCHES" "^E:/C++"

Regular expression "^E:/C++/Opencv 3.0/opencv/sources" cannot compile
Call Stack (most recent call first):
CMakeLists.txt:354 (ocv_include_directories)


Configuring incomplete, errors occurred!
See also "E:/C++/CMakeFiles/CMakeOutput.log".

這種情況為編譯的文件目錄中含有C++導(dǎo)致的，解決方法把文件目中++去掉
參考https://bbs.csdn.net/topics/390979188

Detected version of GNU GCC: 81 (801)
CMake Warning at cmake/OpenCVUtils.cmake:872 (message):
  Download: Local copy of opencv_ffmpeg.dll has invalid MD5 hash:
  d41d8cd98f00b204e9800998ecf8427e (expected:
  89c783eee1c47bfc733f08334ec2e31c)
Call Stack (most recent call first):
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  cmake/OpenCVFindLibsVideo.cmake:206 (include)
  CMakeLists.txt:536 (include)


Downloading opencv_ffmpeg.dll...
CMake Error at cmake/OpenCVUtils.cmake:895 (file):
  file DOWNLOAD HASH mismatch

    for file: [C:/CWockspase/opencv/opencv-3.1.0/3rdparty/ffmpeg/downloads/89c783eee1c47bfc733f08334ec2e31c/opencv_ffmpeg.dll]
      expected hash: [89c783eee1c47bfc733f08334ec2e31c]
        actual hash: [d41d8cd98f00b204e9800998ecf8427e]
             status: [6;"Couldn't resolve host name"]

Call Stack (most recent call first):
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  cmake/OpenCVFindLibsVideo.cmake:206 (include)
  CMakeLists.txt:536 (include)


CMake Error at cmake/OpenCVUtils.cmake:899 (message):
  Failed to download opencv_ffmpeg.dll.  Status=6;"Couldn't resolve host
  name"
Call Stack (most recent call first):
  3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  cmake/OpenCVFindLibsVideo.cmake:206 (include)
  CMakeLists.txt:536 (include)


Configuring incomplete, errors occurred!
See also "C:/CWockspase/opencv/opencv-3.1.0/build/CMakeFiles/CMakeOutput.log".
See also "C:/CWockspase/opencv/opencv-3.1.0/build/CMakeFiles/CMakeError.log".

這種情況是需要下載的opencv_ffmpeg.dll這個文件下載失敗了稼病，下載失敗的原因是域名解析失斚髡帧：下載地址在x:\opencv\opencv-3.1.0\3rdparty\ffmpeg中的ffmpeg.cmake域名地址為raw.githubusercontent.com主要是這個域名被墻導(dǎo)致的
解決方法域名被墻的方法參考https://www.ioiox.com/archives/62.html

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