.SUB File Extension

Movie/Film Subtitle File

Video File
Popular file format used for storing movie/film subtitles, textual representation of the spoken words in a video.

These words are superimposed over a video, and are generally displayed in the lower-portion of the screen.

Each .SUB file has an accompanying .IDX file.

To ensure the subtitles are displayed, the .SUB and .IDX file names need to match the actual video file, so mymovie.avi will require both mymovie.sub and mymovie.idx files.

These subtitle files are popular with online video files (such as those downloaded via torrents) and are often included with the video.

Other .SUB file extensions
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