We used it internally on a project that had about 20 million tracks. 1,000,000 is conservative.
Challenge accepted.
Audio: 722,524 files, 16.3 TB, 87.59 years!
Video: 5189 files, 5.7 TB, 1709 days
No issues here. I've tried other programs and they all seemed to choke.
So I can create a playlist that plays every audio track once and I will finish on Sunday, March 21, 2109