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I'm using Plex to watch media on a 4660X Roku Ultra from late 2018, but turning on subtitles requires media to be transcoded because the subtitles are PGS (image based).
Note: I also have an Amazon Firestick 4K from around the same time and it does not have this limitation. I can select either subtitle track from any video and they display properly without transcoding media on my Plex server.
I prefer the Roku 100% over the Firestick, so I am really hopeful something can be done with the Roku to begin allowing image based subtitles without the need to transcode them into the video.
Absolutely would love this as well. I've tried all other media players across my devices (VLC on most devices, Kodi, etc, and nothing matches reliability of Roku Ultra's built-in Media Player. The image-based subs are its only Achilles' heel!
You would think, at least in this day and age, that a standard feature of any "media player" would be the ability to natively play standard media formats. I would expect by this point the feature request would have asked for something trickier, such as support for the more complex, though still incredibly common, SubStation Alpha subtitle format. But, no, here we are in 2021 still begging for support of subtitle formats that have existed for decades (vobsub and pgs). I mean, they're only the most common subtitle formats for personal media in existence. Why would a media player want to bother supporting something silly like that?
This is all i need, besides this i have zero complaints about my Rokus, but seeing folks on my server direct play embedded PGS subtitles with the AppleTVs and Xbones without any hassle or headaches has me jealous enough to be thinking about upgrading to a Nvidia Shield even though i dont need ATMOS support or anything any time soon.