@speechles can you try to reproduce the issue with that mkv? Thanks.
Sure. It looks like this is related to MOV_TXT. I do not have the issue with SUBRIP. Those properly show up as do SRT. It is only MOV_TXT which appear to have an issue when selected. They properly show in the subtitle picker menu debug as selected and are properly being set as the selectedSubIndex. The problem is somewhere in the loading routine when the subtitle requested in selectedSubIndex is pulled up while loading the content to play. I can chase this down more and figure out exactly where it is dropping the ball. The MOV_TXT do not display. This is an issue.
As far as size of the subtitles the Roku only does text for subtitles. It has one size you set. This size and more can be modified in the Roku subtitle settings (not Emby settings). Whatever you set for the Roku subtitle settings all of the apps on your Roku will adopt and use.
The small/tiny text for subtitles looks like the server is burning these in. It might be scaling up the video but not scaling up the subtitles with it? Difficult to tell without seeing the ffmpeg generated at the same time.
Edited by speechles, 03 March 2020 - 07:48 PM.