Long time Jellyfin user here, welcome on board. I think biggest hurdle I should newbies warn about is the lack of availability on TizenOS.

Its possible but needs some extra steps.

not OP, but this has reared its ugly face once or twice with my friends.

i have been running into another issue, though it may be a firefox issue: playing some filetypes fail to play on web browser but work fine on jellyfin app (i believe my settings are correct for hardware decode on server where it can)

i still have to put some time into figuring it out tho (havent really done my research yet)

Codec Support | Jellyfin

The goal is to Direct Play all media. This means the container, video, audio and subtitles are all compatible with the client. If the media is incompatible for any reason, Jellyfin will use FFmpeg to convert the media to a format that the client can process. Direct Stream will occur if the audio, container or subtitles happen to not be supported. If the video codec is unsupported, this will result in video transcoding. Subtitles can be tricky because they can cause Direct Stream (subtitles are remuxed) or video transcoding (burning in subtitles) to occur. This is the most intensive CPU component of transcoding. Decoding is less intensive than encoding.

oh! thank you! this is the answer :(

though… it kinda makes me want to buy a cheepie intel card just to get that sweet, sweet AV1