I don’t know, from your post whether the tracks analyse gets 600 tracks in or 3400 tracks in ?
Doesn’t matter. It’s probably that one or more of your tracks is corrupt. We don’t get to play every track in large libraries so a wonky track could sit in out collections for decades without us even attempting a load, play or preview, sitting there like digital land mines waiting for Auto-analysis Or auto-something else to trip over it.
The two ways of spotting wonky tracks are:
1 listen to/watch every song you own
2 the “half’s” principle…
Let’s say you got 4000 videos :
Make a copy of the 4000 tracks onto a new drive
Make two folders - A and B - put 2000 tracks in A and the other 2000 tracks in the B folder
Analyse each of those folders, if there’s only one wonky track then either A will fail or B will fail
Whichever folder fails, split it’s tracks into two folders of 1000 tracks each … maybe C and D
Analyse C and D, one will fail … split the folder that fails into two folders, E and F each with 500 tracks in… etc
This way you can narrow down the duff track
If you’ve got more than one diff track, this method still works, but obviously takes longer. Simply add a folder called “Worked” and move all folders which completed analysis into that “worked” folder. Eventually you’ll end up with all the duff tracks outside the “worked” folder