PDF Extra provides extra PDF features for OpTeX (or in limited form for plain LuaTeX and LuaLaTeX).

As a minimalistic package OpTeX doesn't support "advanced" features of PDF file format in the base. This third party package aims to provide them. Summary of supported features:

• insertion of multimedia (audio, video, 3D);
• hyperlinks and other actions,
• trigger events;
• transitions;
• attachments.

The repository of PDF Extra is at https://github.com/vlasakm/pdfextra.

See pdfextra-doc.pdf for documentation. It contains user documentation as well as technical documentation interleaved with source code.

Put pdfextra.opm where your TeX can find it. Additionaly, for plain/LaTeX you need pdfextra.tex, and on top of that pdfextra.sty for LaTeX.

Or just copy paste anything you want.

In OpTeX do: \load [pdfextra].

In plain LuaTeX do: \input pdfextra.

In LuaLaTeX do: \usepackage{pdfextra}.

This package is available under the Zero-Clause BSD license. See LICENSE for more information.