23 points
Certain subtitle formats cannot be directly streamed, so your server is probably re-encoding video on the fly to burn in the subtitles. PGS format is actually a series of images and will always require re-encoding video. Picking SRT should work with device direct streaming.
2 points
That must be it, then. Thankfully I’ve got Bazarr set up to snag SRTs for imported media, so those should generally be available.
2 points