Server Version#: 1.21.1.3876
Player Version#: 5.6.1
All testing with the same movie (x265):
In Xbox I can direct play it successfully.
In Xbox, whenever I add SRT subtitles (disabled burned subtitles) I got a transcoding error.
In Windows, it direct plays without problems even with SRT subtitles (no transcoding error).
In Xbox, if I force transcode (lowering the quality for example) I can play the movie with SRT subtitles.
Conclusions: Xbox can direct play, can transcode, can transcode + SRT subtitles, but cannot directplay + SRT subtitles
Ok, so your logs show the problem is with the subtitles. It was obtained using our subtitle search feature. Can you try downloading another version and see if you get the same problem? You might have gotten a bad file.
The same movie + SRT combination works everywhere (windows, android, mac, kodi + plex), but it breaks in Xbox.
I’ve tried with different STR with exactly the same results. All of the SRT tested were in spanish, because I don’t know how to configure Plex to search for multiple languages in the subtitles search.
You can’t. That only allows searching for 1 subtitle at a time. Can you try an English one, just to see if maybe the XBox is having issues with the Spanish text.
Just to stress it, the error is only present in Xbox, the same media works everywhere. Also, it happens with almost (all?) the sources I have, it’s not just something happening in a single movie.