When direct playing, PGS subtitles are now supported. Enabling them no longer forces a video transcode. Info: Plex for webOS 3.0+ (LG Televisions) - #77 by markus101
There is a limitation in the HLS streaming protocol used between Plex Media Server and the Plex LG webOS app. When direct streaming the media, such as when audio is transcoding, Plex Media Server has to burn in subtitles. If it did not, they would lose sync with the video and audio streams.
Unfortunately, there seems to be no way around the problem right now.
