this post was submitted on 12 Apr 2025
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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?

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[–] [email protected] 1 points 22 hours ago* (last edited 22 hours ago)

Couple of things to note.

The Roku has very little file space. Ensure your fonts are as small as possible!

Also, Jellyfin will only grab the 1st font returned by the API. Even if you have a folder full of fonts, whatever is listed first is what it's going to grab - even if it's a font file format that Roku can't use.

I suggest using the otf format. It's what I have and confirm it works with custom subs.

Due to these limitations, my suggestion is to only have 1 otf font file that is less than 5mb in the fallback font folder.