报错信息：
FFMPEG: Downloading ffmpeg_version.cmake from https://raw.githubusercontent.com/opencv/opencv_3rdparty/7dd0d4f1d6fe75f05f3d3b5e38cbc96c1a2d2809/ffmpeg/ffmpeg_version.cmake
Try 1 failed
=======================================================================
Couldn't download files from the Internet.
Please check the Internet access on this host.
=======================================================================
CMake Warning at cmake/OpenCVDownload.cmake:250 (message):
FFMPEG: Download failed: 6;"Couldn't resolve host name"
For details please refer to the download log file:
C:/Apps/opencv-4.7.0/build/CMakeDownloadLog.txt
Call Stack (most recent call first):
3rdparty/ffmpeg/ffmpeg.cmake:20 (ocv_download)
modules/videoio/cmake/detect_ffmpeg.cmake:17 (download_win_ffmpeg)
modules/videoio/cmake/init.cmake:7 (include)
modules/videoio/cmake/init.cmake:11 (add_backend)
cmake/OpenCVModule.cmake:298 (include)
cmake/OpenCVModule.cmake:361 (_add_modules_1)
cmake/OpenCVModule.cmake:385 (ocv_glob_modules)
CMakeLists.txt:951 (ocv_register_modules)解决思路：
更改cmake文件，使用GitHub Proxy 代理加速 (ghproxy.com)对网址进行转发。、
解决步骤：
① 打开opencv-4.7.0\cmake\OpenCVDownload.cmake，在157行下方增加两行：
（opencv-4.7.0为源码文件夹，不同版本的名称会不一样，如opencv-4.6.0等等）
set(MYPROXY "https://mirror.ghproxy.com/")
set(DL_URL "${MYPROXY}${DL_URL}") 
② 修改完如下图所示（修改完记得保存文件！）
③ 修改完保存文件，用cmake再次configure，成功！文章来源：https://www.toymoban.com/news/detail-775713.html
文章来源地址https://www.toymoban.com/news/detail-775713.html
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