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[Solved] Compressor Batch Transcode Queue Stuck on ‘Waiting’ on macOS Sonoma 14.6: Diagnostic steps and permanent fix

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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] Compressor Batch Transcode Queue Stuck on ‘Waiting’ on macOS Sonoma 14.6: Diagnostic steps and permanent fix

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  • November 15, 2026 at 1:27 am #16552
    Hannah Peterson
    Community Contributor
    Diagnostic Hardware Specs: MacBook Pro 16″ M2 Max | OS Version: macOS Sonoma 14.6 | Archive Source: Apple Support Community #256448905

    I am running into a persistent issue on my MacBook Pro 16″ M2 Max 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 Max (128GB) | iPad Pro 11″ M4 (Apple Pencil Pro) | Salt Lake City, UT
    Computer Science & Machine Learning Student | "Verified Apple Discussions Archive"
    November 15, 2026 at 1:27 am #16553
    Amanda Patel
    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.

    Apple TV 4K 3rd Gen | Dual HomePod mini | iPhone 15 Pro Max | London, UK
    Apple Certified Support Professional (ACSP) | Smart Home & Matter/Thread Integrator
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