If it's only a time shift you need, this also can be done in the container. If you're making an mkv, you can with mkvtoolnix for exemple, enter a timing shift for the subtitles. This is probably why you've never found a tool like this, because it can be done in another way. Of course, if your purpose is not an mkv, it's another story. And, also, the best way is indeed to shift the timing in the subtitles.
|