For the Plex app on LG TVs:
- Enabling image based subtitles, PGS & VOBSUB, results in a video transcode.
- Text subtitles, SRT, direct play.
- However, if the audio is transcoding, enabling SRT subtitles also results in a video transcode.
The TV direct plays AC3, EAC3, dts, & dts-HD audio. TrueHD audio will transcode.
Plex transcodes all video to 8-bit H.264. HDR information is lost in the process. Also, Plex does not tone-map HDR to SDR, so transcoded HDR video generally looks poor, with washed out colors.
So, when using the LG Plex app to watch HDR video:
- Never enable image based subtitles.
- If you listen to TrueHD audio, do not use subtitles of any type.
Note that movies on blu-ray discs with TrueHD audio also include an AC3 version of the audio track. Choose the AC3 version when possible.
