In youtube click "show transcript". It's searchable. Click in it to jump to that part of the video.

This would be ideal. I much prefer seeing everything in text form, in the same place, without having to jump out to YouTube.

I can read many times faster than listen, and more easily skim back if I realise I don't understand something.

The full transcripts are available here in plain text form:

https://github.com/fastai/course22p2/tree/master/summaries

Yet another application for ai (Is there an acronym for that?). Given a video, generate a nicely readable webpage with transcript and tastefully selected stills and short clips.

So many tantalizing possibilities for next-gen A/V blending text (toc, transcript, summary, elaboration, explanation, interaction) with massaged video (speed, excerpts, mashups, synthesis) and HID ("hmm, my viewer just frowned and shifted gaze to the text pane, so let's cut to a synthesized reprise of that last bit with the conceptual steps filled in a bit"). So much fun to be had, modulo patents.

Good luck with the code.