Wow, that's great.

Here's my attempt at building something for language learning since my listening skills trail so far behind my reading skills: https://www.danneu.com/slow-spanish/

It parses this painstakingly created file: https://github.com/danneu/slow-spanish/blob/a455da3a230632c2...

Unfortunately it's really hard to generate the source material (timestamping a transcript).

So my idea was to upload some slow-speaking audio to Youtube and let it autogen its .srt subtitle files. The subtitles don't come out perfectly, but it's the timestamp data I'm after since the goal is a UI that makes it easy to replay and scrub around spoken audio.