Time correction function help you if the subtitle is in sync with the movie, but is some 2-3 seconds delayed. If the subtitle it's not sincronised for the movie file (ie the movie is 23,976 fps and the subtitle is 25 fps) then you can't do anything with this funtcion. You must either syncronise the subtitle using a dedicated program or to download the subtitle wich is syncronised with your version of the movie.
External subtitle it's when you have a video file (mother.avi) and a subtitle file (mother.sub). Internal subtitles are directly muxed into the container and so you have one file (mother.mkv for example)
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