Creates a subtitle based on the subtitle at the specified index and adds it to the collection, inserting it right before that index.
True if the subtitle could be added, false otherwise.
The newly created subtitle's times will be based on the specified subtitle. Its end time will be the start time of the existing subtitle minus MinTimeBetweenSubtitles. Its duration will be MaxSingleLineSubtitleDuration. Both times will be wrapped to zero if they are less than zero.
SubtitleCollection Class | SubLib Namespace