The keys a detail map is written with.
The whole version banner, build configuration included.
A spawned command line, joined with spaces.
The absolute path of the ffmpeg binary that was resolved.
The absolute path of the ffprobe binary that was resolved.
The version of a binary that was found and refused, or nothing when none was found.
nothing
Why a lookup failed or a run fell back, readable by a person.
The version the resolved binary printed.