[Solved] Mac Studio M1 Ultra Compressor Batch Transcode Queue Stuck on ‘Waiting’ (macOS Sequoia 15.1) – Verified Troubleshooting

[Joseph McDonald]

Diagnostic Hardware Specs: Mac Studio M1 Ultra | OS Version: macOS Sequoia 15.1 | Archive Source: Apple Support Community #256335064

I am running into a persistent issue on my Mac Studio M1 Ultra running macOS Sequoia 15.1.
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?

MacBook Air 15″ M3 (24GB) | LG UltraFine 5K | Apple Pencil Pro | Oxford, UK

Product Designer & Design Systems Lead | "Verified Apple Discussions Archive"

[Joan Patel]

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.

iMac 24″ M3 (16GB) | Kawai MP11SE Stage Piano | AirPods Max | Gothenburg, SE

Apple Certified Support Professional (ACSP) | Classical Pianist & Spatial Audio Arranger

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