Question 1

Why do subtitles become progressively out of sync over time?

Accepted Answer

Progressive desynchronization occurs when the subtitle file was timed to video with a different frame rate than the video being watched (e.g., 23.976 fps NTSC vs 25.000 fps PAL), causing subtitles to drift by approximately 4.1% or roughly 2.5 seconds every minute.

Question 2

How do I fix subtitles that appear 2 seconds before the audio?

Accepted Answer

If subtitles appear 2 seconds before the actors speak, apply a positive offset of +2000 milliseconds (+2.000s) to delay each cue so the text aligns precisely with speech.

Question 3

Does this subtitle synchronizer support both SRT and WebVTT formats?

Accepted Answer

Yes. The calibrator automatically parses SubRip (.SRT) format using comma millisecond delimiters and WebVTT (.VTT) format using period delimiters.

Subtitle Timecode Synchronizer & Offset Calibrator

How Subtitle Time Shifting Works

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