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打开ffmpeg.cmake

把原本的网址前面加上代理网址 https://mirror.ghproxy.com/

将

"https://raw.githubusercontent.com/opencv/opencv_3rdparty/${FFMPEG_BINARIES_COMMIT}/ffmpeg/"

修改为

"https://mirror.ghproxy.com/https://raw.githubusercontent.com/opencv/opencv_3rdparty/${FFMPEG_BINARIES_COMMIT}/ffmpeg/"