I was testing and after searching a bit about it, I found something strange. Some movies I’ve downloaded has external subtitles in .srt format. I saw that this extension is compatible with Plex at all. But in all movies, when I try to put the subtitle, it transcode it! Like it was not compatible.
I tried it in my LG WebOS Smart TV, PS4 and Android and all of them has the same behavior. Is that normal?
I don’t have any problems using external SRT subtitles with is set to Automatic.
If the player isn’t incompatible with anything else in the file (audio formats, for example) it will transcode. You will have to look up what formats each player is compatible with.
Look, I tried here. I got a Movie with external subtitle in .srt. when I play It without subtitles, It Direct streams, but with subtitles, It transcode It ALL.