Tl/Dr: Which subtitle formats does Roku’s custom subtitle option support?

Hi, I’m using the 3.0.1 Roku client, server version 10.10.1 on MacOS 10.13. I’m watching a series with Chinese srt subtitles and enabled fallback fonts, directed them to a folder full of necessary woff2 and otf fonts as well as enabled custom subtitles on the client. But the srts either display squares or just nothing at all. Works fine if I switch to the ass file I exported though. Does the CJK support only apply to ass/ssa files or is there something I’m doing wrong?

  • Update: so apparently I’ve been using internal srt all this time 😅 but I tried it with external and this time it still didn’t work, but no errors in log. Will keep trying other fonts just in case

    EDIT: Checked playback info and it mentioned the dimensions and level of the subtitle were all 0. Does that mean anything?