[pgz]

I made something similar for Japanese learning, but instead of merging subtitles, I analyze the Japanese subs with mecab, look up the words I likely don't know based on their JLPT level, and add them with reading and translation on the top right of the video.

I also plan to auto generate Anki cards with unknown words when I do the analysis pass.

[zhamisen]

Yours is this one from github, right?

https://github.com/juliango202/jijimaku

I found it very nice. Thank you for developing this solution :)

[pgz]

I have not open-sourced my code since it's a gross hack I did in one afternoon.

It looks exactly like the screenshot of that project. Very interesting that I thought of the same solution without knowing jijimaku.