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Timed text is a text that is synchronized with another source, typically as subtitle of a video. Is there a related \LaTeX package? Can PDFLaTeX output be made to "scroll up" according to certain time-stamps in the source file. That is, can we insert certain time-stamps in a \LaTeX code so that the output PDF shows up in a rectangle, with a highlight for the current segment in the middle of rectangle, and PDF scrolls up in real time according to some time-tags.

This post, on simulating terminal output, comes close.

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Is there a “Timed Text” package?

Not as far as I know.

Can PDFLaTeX output be made to "scroll up" according to certain time-stamps in the source file?

It probably could, dvisvgm would be your friend, SVG can be included in PDF.

The case of embedding a video with subtitles is something else to me. This can be done with package media9. This package can include SMIL (Synchronized Multimedia Integration Language) files. But you would have to produce the SMIL in another program.

However, you tagged your question with accessibility and from this point of view interaction in PDF is strongly discouraged. Such a PDF would not adhere to the PDF/UA standard for accessible documents because interaction is forbidden. How would a braille display handle a moving rectangle? Or a screen reader?

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  • Thanks for the pointer. The accessibility issue is in regard to providing a transcript for the deaf in sync with a video. The issue also comes up for translation into another language for the hearing.
    – Maesumi
    Apr 10, 2020 at 1:22
  • @Maesmi I adjusted my answer to cover your comment.
    – tanGIS
    Apr 10, 2020 at 21:56

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