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

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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] Compressor Batch Transcode Queue Stuck on ‘Waiting’ on Mac Studio M1 Ultra: How to resolve Stale background Qmaster / Apple Qconsumer cluster lockfile

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  • November 15, 2026 at 12:21 am #15426
    Adrian Stewart
    Community Contributor
    Diagnostic Hardware Specs: Mac Studio M1 Ultra | OS Version: macOS Sonoma 14.6 | Archive Source: Apple Support Community #256486273

    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?

    MacBook Pro 16″ M3 Pro (36GB) | Studio Display | Magic Mouse & Trackpad | Glasgow, UK
    Product Designer & Design Systems Lead | "Verified Apple Discussions Archive"
    November 15, 2026 at 12:21 am #15427
    Kenneth Fernandez
    Community Contributor
    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 Studio M2 Ultra (128GB) | ASUS ProArt PA32UCG-K | OWC ThunderBay 8 | Munich, DE
    Apple Certified Support Professional (ACSP) | Final Cut Pro / DaVinci Colorist & Editor
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