levels displays individual "edit method" stream values before the threshold procedure (if any) is applied. It mainly exists to be used by other programs so they can build on auto-editor's media analysis.
Because typical levels output is so long, it won't be displayed verbatim.
auto-editor levels example.mp4
@start
0.00008813678829543451
0.00026441036488630354
0.00026441036488630354
0.00017627357659086903
0.00775603736999823726
0.04794641283271637577
0.14604265820553499755
0.44368059227921735621
0.52362065926317646891
0.46201304424466771437
0.47611493037193725053
0.51427815970386037137
0.86162524237616777700
0.76291203948528119039
0.70853164110699806688
(Continues for 1000 more lines)
0.18905341089370703012
0.02793936188965273973
0.01401374933897408734
0.01189846641988365900
0.00493566014454433280
0.00317292437863564251
0.00105764145954521417
0.00008813678829543451
0.00008813678829543451
0.00000000000000000000
0.00000000000000000000
(30 more lines)
0.00000000000000000000
0.00000000000000000000
0.00000000000000000000
0.00000000000000000000
levels uses --edit to determine what is being analyzed, which by default is audio.