Look at version_major.h when for newer ffmpeg libs
In ffmpeg 5.1, it seems most (or all) of these libraries use a separate version_major.h, so the logic to check minimum version didn't work without looking at the major version file.
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@ -116,6 +116,10 @@ function(find_ffmpeg LIBNAME)
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endforeach()
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string(TOUPPER ${LIBNAME} LIBNAME_UPPER)
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file(STRINGS "${FFmpeg_INCLUDE_${LIBNAME}}/lib${LIBNAME}/version.h" _FFmpeg_VERSION_H_CONTENTS REGEX "#define LIB${LIBNAME_UPPER}_VERSION_(MAJOR|MINOR|MICRO) ")
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if (EXISTS "${FFmpeg_INCLUDE_${LIBNAME}}/lib${LIBNAME}/version_major.h")
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file(STRINGS "${FFmpeg_INCLUDE_${LIBNAME}}/lib${LIBNAME}/version_major.h" _FFmpeg_MAJOR_VERSION_H_CONTENTS REGEX "#define LIB${LIBNAME_UPPER}_VERSION_MAJOR ")
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string(APPEND _FFmpeg_VERSION_H_CONTENTS "\n" ${_FFmpeg_MAJOR_VERSION_H_CONTENTS})
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endif()
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set(_FFmpeg_VERSION_REGEX "([0-9]+)")
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foreach(v MAJOR MINOR MICRO)
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if("${_FFmpeg_VERSION_H_CONTENTS}" MATCHES "#define LIB${LIBNAME_UPPER}_VERSION_${v}[\\t ]+${_FFmpeg_VERSION_REGEX}")
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