opencv 4.5.1 mingw编译opencv_ffmpeg的必备文件

为了成功编译opencv_ffmpeg，您需要下载以下文件：https://raw.githubusercontent.com/opencv_3rdparty/6152e132572dfdaa32887eabeb7199bef49b14dc/ffmpeg/opencv_videoio_ffmpeg.dll，https://raw.githubusercontent.com/opencv_3rdparty/6152e132572dfdaa32887eabeb7199bef49b14dc/ffmpeg/opencv_videoio_ffmpeg_64.dll和https://raw.githubusercontent.com/opencv_3rdparty/6152e132572dfdaa32887eabeb7199bef49b14dc/ffmpeg_version.cmake。这些文件是opencv_ffmpeg编译所需的必备文件。请务必确保下载正确的版本。