One FFmpeg library's two version columns and the verdict comparing them.
What the headers said, as major.minor.micro.
major.minor.micro
True when this library's two columns are compatible.
libavutil, libavcodec and so on.
libavutil
libavcodec
What the runtime answers, as major.minor.micro.
ok, major mismatch, runtime older than headers, micro older than headers or configuration disagrees.
ok
major mismatch
runtime older than headers
micro older than headers
configuration disagrees