I have a browser extension that does the same thing but when you're on the actual sites and I wanted a similar experience for mobile : )

(And a cool demo too)

- Transliteration is done via to-jyutping (by Jyutping.org)

- Subtitles were either generated from scratch via a pipeline that I've been working on with some Canto AI friends

- Or generated from an internal YouTube captions API by converting it to an SRT and then translating each line then prefixing (zh), (yue) or (en) respectively