Subtitle timing: constant offset or gradual drift?
A constant offset is the same timing error throughout a video. Drift is an error that changes over time. Shift all cues only when one offset fits the whole file; correcting the first line alone does not prove the rest is synchronized.
Measure three points before changing anything
Find a distinct spoken phrase near the beginning, middle and end of your video. Compare when it is spoken with the start time of its subtitle. Write down the difference at each point. Use the same video version you intend to publish.
If every subtitle starts 1.5 seconds before its speech, moving all cues later by 1.5 seconds is a useful correction. If the errors are 0.2, 2.0 and 4.0 seconds, a single offset cannot match all three.
Use the sign that matches the symptom
For subtitles that appear too early, choose Later. For subtitles that appear too late, choose Earlier. In CueRefine, the preview lets you inspect the new timestamps before you apply them.
In the synthetic example, a cue spanning 1.200–4.400 seconds becomes 2.700–5.900 seconds after a later offset of 1.500 seconds. The duration remains 3.200 seconds. No speech detection is involved.
If the error grows or jumps
Gradual drift can call for a timing-rate adjustment; abrupt changes can indicate cuts or mismatched video versions. These symptoms are clues, not a diagnosis of the exact cause. Compare more points before selecting a repair.
CueRefine’s fixed-offset tool does not stretch timing, align audio or repair different edits of a video. Use a subtitle workflow with the required synchronization controls, or obtain a subtitle file matched to your video.
Verify the saved result
Apply the offset once and download the saved file. Reopen that export in your player and check all three reference points. Keep the original so you can start again if the measurement was wrong.
Further applications are cumulative: applying +1.500 seconds twice adds 3.000 seconds. Use undo for a mistaken application. If moving earlier would create any negative timestamp, the entire operation is blocked.
| Observed symptom | What to check | Fixed offset suitable? |
|---|---|---|
| Same delay at beginning, middle and end | One consistent time difference | Usually, after checking the sample points |
| Delay grows through the video | Timing rate and video version | No |
| Timing changes after a scene cut | Different cut or missing section | Not as a whole-file repair |
Examples and product behavior checked on October 9, 2026.