GNOME Subtitles

GNOME Subtitles is a good tool to edit, sync and perform all other common operations on subtitles.

Installing it is easy:

$ sudo apt install gnome-subtitles

Open up a subtitle file and you can perform the following operations:

• Timings > Adjust: Give the actual times for the first and the last subtitle. All the subtitles are stretched or compressed a bit to fall within this range.

• Timings > Shift: Give the time duration by which to shift all or a section of the subtitles forward or backward.

Tried with: GNOME Subtitles 1.3 and Ubuntu 14.04