Fix subtitles that are early or late
If every subtitle appears one second too early, enter 1.0 seconds to delay the entire track. If captions are two seconds late, enter -2.0. Decimal values such as 0.75 seconds also work.
Cue start times are clamped to 00:00:00,000 if they would become negative. Captions that finish at or before zero are removed, because they would have no visible duration.
This solves a constant offset, not subtitle drift caused by a different frame rate or playback speed.
Common questions
What does a negative number do?
It moves captions earlier. For example, -1.5 moves every subtitle 1.5 seconds earlier.
Why did the number of captions change?
Captions that would end before time zero are removed. Review results after a large negative shift.
Is this a frame-rate converter?
No. It applies the same offset to each timestamp.