I have a video file located in the repository at public/video/demo.webm

I try to reference it with a url in content/index.mdx like so:

  <video>
    <source src="https://github.com/video/demo.webm" type="video/webm" />
  </video>

This works fine so long as there is no basePath set in next.config.mjs. However, as soon as there is a basePath, it no longer works (404 as the requested url does not include the basePath).

I don't know the basePath in advance as it varies at build time. How can I get the basePath onto all of my asset urls?