Subtitle timing: constant offset or gradual drift?

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 Shift timing tab applies only a fixed offset. For a section that needs its own correction, use Shift a range. For a consistent timing-rate difference, use More subtitle tools → Two-point synchronization. None of these automatically detects speech or reconstructs missing scenes.

Correct gradual drift with two matched moments

Two-point synchronization changes the timing scale and durations throughout the file, including outside the anchors. Only apply it when the same timing relationship fits your media; a different scene cut may need separate work.

1. In Media preview, identify a clear subtitle near the beginning and its corresponding video moment. Note the subtitle time and video time.
2. Choose More subtitle tools → Two-point synchronization. Enter the first subtitle/video pair.
3. Find a second matched moment farther into the video and enter the second pair. Closing the dialog retains these values until the document changes.
4. Review the timing scale and first/selected/last preview, then Apply changes. Check a third point in the middle and Undo if it does not fit.

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.