Subtitles out of sync

[TheDreadPirate]

That's the thing. This issue only happens when everything is direct playing. When the video is direct playing the SRT subtitles are rendered and displayed directly by the client. And how the subtitles are handled depends on the client since Jellyfin uses the built in subtitle renderer. When the video is transcoded the subtitles are burned in by Jellyfin/ffmpeg.