Overview

srtshift retimes subtitle files. It reads a subtitle track, moves the timestamps the way you ask, and writes the result back — without touching the dialogue, styling or positioning.

It exists for the three ways a subtitle track tends to go wrong:

• A constant offset. Every line is late or early by the same amount, usually because the track was made for a release with a different intro length.
• A frame-rate mismatch. The track was timed for 23.976 fps but the video is 25 fps (or the reverse), so the drift grows as the film plays.
• A partial drift. Everything is fine until a cut — a removed ad break or a missing scene — and the rest of the file is off from there.

Each of these is one command. Start with installation, then see usage for the full option list.

A first run

Shift a file two seconds earlier and save it next to the original:

srtshift -2s -o episode.fixed.srt episode.srt

Supported formats