How to load ttml subtitles?

[bitmap]

You can use ffmpeg to convert ttml to srt.

Code:

ffmpeg -i file.mp4 -c:s srt file.en.srt

I assume they're embedded. Since Jellyfin likes external files better anyways, this is the way to do it. Replace "en" with the two-letter language code for whatever language you're pulling out. If it's not the first ttml stream, you'll have to map it, which is a different thing altogether.