「OpenCV」 OpenCV 安装

1 常见问题

1. cap_ffmpeg_api.hpp: No such file

   # opencv 4.1+
   opencv_contrib/modules/cudacodec/src/precomp.hpp:84:41: fatal error: ../src/cap_ffmpeg_api.hpp: No such file or directory
   

   OpenCV fix 14774 breaks cudacodec

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