SUB is a legacy format used by certain educational publishers to caption or add video description their multimedia offerings.
The SUB module generates an ASCII template to be fleshed out with particulars like font, and color before it can be used in Internet and multimedia applications.
The SUB template generated by AutoCaption takes care of the hard work by identifying what the caption must say, how the caption is formatted, and when it must appear.
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Artwork ©Bradley Bleeker, illustrator