| Global Sync Drift Late | |
| Display Text | Global Sync Drift Late |
| Description | “Global Sync Drift Late” refers to audio sync with picture or timed text that drifts progressively later through a section or entire program (e.g. Audio/text starts in sync, is 2 seconds late towards the middle of program, and 5 seconds late by the end of program). |
| Impact | Global sync drift will become progressively more noticeable and distracting to members, potentially making the content unwatchable, if it extends through the entire program runtime. |
| Severity Assessment Guidance | |
| FYI | N/A |
| Issue | Audio drifts late compared to on screen action through a scene or multiple scenes. |
| Blocker | Audio drifts late compared to on screen action through the majority of or the entirety of the program. Text drifts late compared to corresponding audio cues/on-screen action through the majority of or the entirety of the program. |
| Solutions | |
| 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. For text files, ensure that the framerate matches the video’s framerate. |
| How to Fix | Adjust frame rate or fix sync on timeline and re-export audio as needed. For text files, convert the framerate of the file to match the video’s framerate. If both the text and video files are timed to 23.976fps, this may be attributed to confusion around SMPTE vs. MEDIA timebase. Please refer to Timed Text Sync - Global Drift Late (Text) for more in-depth troubleshooting techniques. |