UNLESS it is a Roku TV {I have none}, Roku is always a separate device, there is one {IP.218} on my TV {IP.190} and one {IP.22} on wife's TV {IP.146} and one out in my Gunsmith Shop on another Vizio TV. {those aren't ON unless I go out there}
In the "old" Settings, I checked the box "Add Engin Names after filenames" which notated that the "Engine - no matter where I was trying to view - was "FFmpeg" in the Title, not sure if that matters.
The wife's Vizio, and the Gunsmith Vizio TVs won't play any of the .mp4 movie files, in fact it shows them as ".mpg" and produced this error numerous times for each movie I tried to play:
"19:53:20 WARN Device descriptor retrieval failed: h,t,t,p,://192.168.1.5:2869/upnphost/udhisapi.dll?content=uuid:8ff82b53-5dd7-4d69-a673-
0aa5afde7cd5, 400 Bad Request"
{this portion changed for each Title}
You have mentioned that the HLS does not support External Subtitles, yet Subtitles did work {whether external or internal idk}, I'm sure, in v12.1, which was one of the reasons I wanted to stay at that version... it was the first thing I noticed that didn't work when I updated, and is the only function - for me - that I need to get working and still doesn't in v14.10.1
ALL the movies have INTERNAL Subtitles, and show such when played through VLC or Windows Media Player {both New and Old versions} and "MS Movies & TV App", MKVtoolKit, and DaVinci Resolve...
The reason this is not working has got to be easy and stupid simple... an oversight of a misplaced jot or tittle as it were somewhere....
I have gone to great lengths to obtain External Subtitles for every movie I have and it is a great disappointment the neither Internal nor External Subtitles work at this time. No on UMS web player, Not on Roku, and Not on my TV.
I am willing to continue to test for you, but it HAS to work for ME through the ROKU at some point.
Tried playing on TCL TV direct... movie plays perfectly, no Subtitles, No controls for Subtitles. Used TV's Remote to check and verify that "Captions" were indeed "ON", switched them OFF and back ON, still nothing.
I unchecked the "Force external subtitles" and the "Automatically load *.srt with the same file name", and tried the TV directly again ... No Subtitles, and no controls for them... except one movie title "Red Notice.mkv" had subtitles on web player and on my TV, I changed the extension to .mp4 and still had Subtitles on web player and TV, but still not thru Roku... so hopeful.
Any ideas as to why the UMS keeps doing this while playing a movie, any movie ???
00:40:23 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:40:32 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:40:44 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:40:50 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:41:02 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:41:12 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:41:20 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:41:26 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:41:32 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:41:37 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:41:38 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:41:50 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:42:19 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:42:24 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:42:36 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:42:43 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:42:56 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:43:03 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:08 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:15 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:22 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:33 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:43:34 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:42 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:43:46 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:43:52 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:44:05 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:44:10 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:44:15 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:44:21 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:44:27 INFO Stopped playing Red Notice - (2021).mp4 on Roku 4 (NSP 6-7)
00:44:32 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
00:44:38 INFO Started playing Red Notice - (2021).mp4 (FFmpeg HLS Video) on your Roku 4 (NSP 6-7)
and while playing, it still has that audio glitchmute for a nanosecond every few to 5 seconds - didn't EVER do that before in ANY version, it's new in v14 for me.
...