Roku srt subtitle support with mp4

I found this listing that you could name subititle files to set languages and forced as valid options:
https://www.serviio.org/index.php?optio ... icle&id=33

When using an external subtitles file, it has to named with the same name as the video file, except the extension, e.g.:
my_movie.avi
my_movie.srt

You can also specify the language, e.g.:
my_movie.avi
my_movie_en.srt
my_movie-de.sub
my_movie(fra).srt
my_movie.cz.srt

You can also force a subtitle file to side-step the language rules. Simply put the word forced into the file name, like:
my_movie.avi
my_movie.forced.srt
my_movie-de.forced.sub
my_movie(fra).forced.srt
my_movie.cz.forced.srt

Curious if the <filename>_en.srt is just an example or if <filename>.en.srt should also be supported.

So far, the only thing that seems to work for me is: <filename>.srt

I would like to be able to have files that are forced and full CC for when I watch late at night, or watching stuff that has heavy accents.

I suppose I could tinker around and try various file name structures and see, was just hoping there was a list already hammered out for roku devices.

My primary roku is a roku ultra 4660x and my secondary is a roku ultra 4640x so I can use the toslink for audio to my older soundbar that doesn't have HDMI in/out.

I have my serviio setup so it doesn't transcode as I encode the files in mp4/h264/ac3 before putting them on my media server. I had started this way due to the fact that I used to use sony bluray players as my DLNA player and have since changed to the roku devices for DLNA and all streaming needs.

[atc98092]

Based on the list you posted, <filename>.en.srt should work. At least, from Serviio's standpoint. I can't find anything specific to Roku devices, but at least one website I found that discusses naming SRT files recommends this format. Just remember the filename must be identical for the video and the SRT, only differing with the file extension and the potential language ID. The handful of SRT files I have are all English and I don't bother with adding the language ID label.

I seldom use a Roku for my local media these days (Roku Media Player has had broken functionality for some file types for years and they haven't updated the app in a long time), but best I remember the SRT files play fine with my various Roku players.