Subtitle Edit is a useful tool to work with subtitles. One of the basic tasks you might want to perform is to repair a subtitles file that is out of sync with the video. The easiest way to do this in Subtitle Edit is by using its Visual Sync.
- Place the video file and its subtitle file in the same directory. Make sure the filename prefix of both the files are the same.
- Open the subtitles file in Subtitle Edit.
- Choose Synchronization > Visual Sync.
- Subtitle Edit shows a split screen with a video player in each. The video player in the first split is seeked to the first subtitle and that in the second split to the last subtitle.
- Now, play the video in a split a bit until someone speaks something. Pause it. Pick the subtitle from the dropdown below that matches what was spoken. Do the same with the second video player.
- Press Sync and let Subtitle Edit do the work of shifting forward, backward, squeezing or expanding the subtitles to match the video. Press Save and you are done.
Tried with: Subtitle Edit 3.3.1 and Windows 8 x64