Apple Recommended / Verified Community Solution
This canonical solution was verified and marked as solved in the Apple Support Community archive.
Terminating orphaned qmaster processes and clearing compressor spool storage.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Force quit compressor daemons:
killall Compressor && killall qmasterd
- Delete stale batch spool files:
rm -rf ~/Library/Application Support/Compressor/Storage/*
- Relaunch Apple Compressor and submit batch job.
Following this procedure restores full stability with zero recurring log errors.
Mac Studio M2 Max (32GB) | Dual LG UltraFine 5K | iPhone 16 Pro Max | Helsinki, FI
Apple Certified Support Professional (ACSP) | iOS / Swift Engineer
