Global Sync Drift Early (Audio)
"Global Sync Drift Early” refers to audio sync that drifts progressively earlier through a section or entire program (i.e. Audio starts in sync, is 2 seconds early in towards the middle of program, and 5 seconds early by the end of program).
Global audio sync drift impacts Technical and Content quality. It will become progressively more noticeable and distracting to the customer, ultimately making the content unwatchable.
Audio drifts early compared to on screen action and dialogue.
How to Prevent:
Review audio on timeline and ensure it is properly aligned with on-screen action, as sync can easily shift during an edit.
Verify that audio and video have been recorded at the same frame rate.
Adjust frame rate or fix sync on timeline and re-export audio as needed. Check the M&E for the same issue, and redeliver M&E as well if necessary.