Actually, the designer is now working with three files. The video is one file, the text for captioning is another and the SMIL file which contains directions to control the other files is the third file. As simple as this sounds, it takes experience to feed the new text and synchronize with the video. In fact, the designer must have seen the video more than once previously to ensure his ability to mark the text at just the correct spot. Sitting there with fixed attention for a prolonged period while concentrating on both the text and the video requires considerable patience.
Internet captioning provides a wide variety of options for the captioned text.
The designer can adjust font type, font size, font style, font and background colors. This enhances the accessibility of the captions. Deaf users may also be low vision or learning disabled. This control over the font means there is the ability to meet the needs of someone with multiple disabilities. The examples that follow show the makeup of a media SMIL file and the streaming text file.