I believe that plex is built on ffmpeg right? If not the rest of this might not apply perfectly but i'll go ahead and explain. anime is subtitled with soft subs in .ass format. Most of the time, this includes complex "typesetting" to translate text on screen. these are done with xy-vsfilter on …

anime - .ass/.avs/ffmpeg vfilter/fonts

tom80H Closed March 31, 2021, 4:44pm 10

Early 2021 clean-up: duplicate

Topic		Replies	Views
Can you support ASS/SSA subtitle already? Plex Features	43	5928	July 27, 2021
No reconoce subtitulos en formato .ass Español - Spanish	11	1679	January 8, 2020
Option to try convert subtitles to DirectPlay able format so it doesn't transcode all the video to burn the subtitles Feature Suggestions	2	342	September 13, 2019
Plex ASS subtitle support Plex Features android-mobile-legacy , fire-tv , subtitles	15	17832	January 9, 2020
Will Android Plex player get the .ass subtitle (without transcoding) support by any chance? Plex Players android-mobile-legacy , android-tv	4	343	June 15, 2022