[Solved] How to fix Compressor Batch Transcode Queue Stuck on ‘Waiting’ caused by Stale background Qmaster / Apple Qconsumer cluster lockfile on Mac Studio M1 Ultra

[Kelly Ward]

Diagnostic Hardware Specs: Mac Studio M1 Ultra | OS Version: macOS Sonoma 14.6 | Archive Source: Apple Support Community #256350171

I am running into a persistent issue on my Mac Studio M1 Ultra running macOS Sonoma 14.6.
Whenever the machine encounters Stale background Qmaster / Apple Qconsumer cluster lockfile, the following diagnostic log appears in Console:

Compressor: [qmaster] Service cluster lockfile present: refusing new batch job submission

I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

Mac mini M2 Pro (32GB) | Dell UltraSharp U3223QE | Jamf Cloud Admin | Edinburgh, UK

Enterprise Mac Sysadmin & Jamf Pro Architect | "Verified Apple Discussions Archive"

[Sean Lehmann]

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:

1. Force quit compressor daemons:

   killall Compressor && killall qmasterd

2. Delete stale batch spool files:

   rm -rf ~/Library/Application Support/Compressor/Storage/*

3. Relaunch Apple Compressor and submit batch job.

Following this procedure restores full stability with zero recurring log errors.

Mac mini M2 Pro (32GB) | Dell UltraSharp U3223QE | Jamf Cloud Admin | Wellington, NZ

Apple Certified Support Professional (ACSP) | Enterprise Mac Sysadmin & Jamf Pro Architect

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