I got a video file with a duartion of e.g. 30 mins and a subtitle file that belongs to this video. But the subtitle file only lasts 25 minutes.

Now I'm searching for a way to achieve the following: I want to "stretch" those subtitles so that they also last 30 mins with a command line tool (to do this automatized in a little program). So the times when a caption is shown needs to be "scaled". For example, if a caption is shown from 0 to 10 seconds, it should be corrected to 0 to 10*30/25=12 seconds.

This is possible with Gnome Subtitles by sync --> correct and changing the end time, but this program only has a GUI.

So, is there a tool that has a CLI to archieve this?

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