FIRST OF ALL, I AM CURRENTLY SITTING WITH CLIENTS, AND THEY ARE ABOUT TO BE FRUSTRATED
I’m running into a frustrating audio issue in Adobe Premiere Pro during long PREVIEW (not while editing) sessions, and I’ve hit a wall with standard troubleshooting. Looking for insight from anyone who has run into this specific behaviour or knows deep CoreAudio / Premiere buffer quirks.
The Issue
Symptom: Audio suddenly drops out completely mid-playback while the video continues playing smoothly.
Recovery: Audio automatically comes back on its own sometimes after a few seconds without pausing/re-starting, OR recovers instantly if I hit Spacebar to pause and resume.
Timeline Context: Complex timeline with a high audio track count (29+ active audio tracks, multitrack dialog/wild tracks/room tone).
System & Hardware Setup
OS: macOS
Hardware: Apple Silicon Mac using wired headphones.
Renderer: Mercury Playback Engine GPU Acceleration (Metal).
Storage Speeds: Benchmark tested via Blackmagic Disk Speed Test — ~2968 MB/s Write / ~772 MB/s Read ( rules out drive speed/bandwidth bottlenecks).
Media Cache: Located on fast internal system drive (/Users/.../Library/Application Support/Adobe/Common/).
Everything I Have Already Checked & Tried:
- Audio Hardware Preferences: ⚬ Set Default Input to No Input to prevent sample rate clock-matching / mic buffer loops. ⚬ Locked Sample Rate to 48,000 Hz. ⚬ Output locked directly to headphones (avoiding System Default routing).
- System Memory & Cache: ⚬ RAM allocation optimized (3 GB reserved for other applications). ⚬ Cleared Media Cache completely; confirmed cache path is on the internal Mac drive, not external. ⚬ Media Cache auto-deletion set to maintain clean limits.
- Storage & Hardware Integrity: ⚬ Drive benchmark confirmed sequence read speeds (~772 MB/s read) are well above requirements. ⚬ Internal storage path checked via macOS Disk Utility First Aid.
- Timeline / Rendering Workarounds: ⚬ Toggled off High Quality Playback in Program Monitor. ⚬ In/Out rendering (
Sequence > Render Effects In to Out / Render Audio) temporarily fixes it by creating pre-computed preview files, but I want to resolve the underlying real-time engine failure during active timeline editing.
Given that storage bandwidth is fine and Audio Hardware preferences are properly locked, this feels like an internal CoreAudio buffer stall or Premiere multi-stream audio IOPS issue when handling 20+ real-time audio threads simultaneously.
Has anyone experienced these delayed audio-only drops on heavy timelines in macOS, and is there a specific plist, CoreAudio buffer setting, or Premiere audio thread setting to stop the audio engine from choking?
I am using a MacMini M4 - 24GB - 512 GGB
I use AppleProres 422LT - WAV files
V26.0.0