[rileyt]

It uses Whisper for transcripts, which I believe are better than the YouTube generated ones.

My guess is that there are more relevant results from the semantic search than I'm including in the context (to reduce costs) and that exact snippet isn't being given to the answering model as context.

[lemming]

As I wrote here: https://news.ycombinator.com/item?id=34035123, I also wrote a tool to access them. I'm pretty sure there are English transcripts which are manually generated, not just the YouTube generated ones. I've always found them to be high quality, enough to make a book out of.

[jamesbriggs]

For Huberman Podcast I imagine he pays someone to do the annotations manually, so they're accurate. But on most videos I've found Whisper's annotations to be more accurate than YouTube's default annotations - not to bash YouTube's, they're still great but occasionally you get some weird annotations