Movie won't play with SRT subtitles enabled -- audio issue?

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The video is probably transcoding. If your system cannot transcode 4K video in real time, then the movie will buffer or not play.

The Plex app on Samsung TVs direct plays AC3 & EAC3 audio. TrueHD and dts/dts-HD MA transcode.

Enabling subtitles of any type when the audio is transcoding results in a video transcode.

Enabling image based subtitles, PGS & VOBSUB, results in a video transcode whether or not the audio is transcoding.

Transcoding 4K video is very compute intensive. Unless your system can handle it that is probably why the movie does not play.

To verify:

  1. Check Plex Dashboard -> Now Playing while playing the movie. It will show if the audio or video is transcoding.

or

  1. You can also check the log files. Look for lines with MDE: in Plex Media Server.log. Make sure your Plex server is set for debug, not verbose, logs. See Reporting issues with Plex Media Server for details on configuring your system for debug logs and retrieving the log files.