Here's the new tool I built: https://til.simonwillison.net/tools/annotated-presentations - plus an animated GIF showing how it can be used
(I used ChatGPT extensively in building it, the prompts I used are included in my write-up of the tool)
I experimented with using Claude to clean up the YouTube transcript of my talk and turn it into text I could use in the annotated presentation - it did a pretty great job, though I ended up using just small portions and applying many of my own edits anyway
A particularly fun detail of the https://til.simonwillison.net/tools/annotated-presentations tool is how it uses Tesseract.js OCR (running in the browser) to extract suggested alt= text from the images
I wrote more about that in this TIL: https://til.simonwillison.net/javascript/tesseract-ocr-javascript
