Does this sync subs to the audio?
I'm exploring the idea though and doing some research on how this can be done. So it could be a feature for the future. :-)
* Extract a few sentences from the middle of the subtitle file.
* Extract the audio for those sentences from the video file
* Run speech-to-text and verify that at least a few of the words were the same.
It kind of worked on some shows, but not reliably..