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This is specifically for subtitles that are sourced from a separate file. It does not related to optional subtitles built into some video file types, such as mkv files, and "forced" subtitles that are encoded graphically as part of the video frames.This is specifically for subtitles that are sourced from a separate file. It does not related to optional "embedded" subtitles built into some video file types, such as mkv files, and "forced" subtitles that are encoded graphically as part of the video frames.