When I view movies or tv shows from my Channels Library using Channels in Windows or my iPhone, the subtitles switch allows me to turn subtitles on or off, but subtitles are not displayed at all. The same file when viewed in Plex on any device displays subtitles when subtitles are turned on. In Plex, the subtitles are displayed as MOV_TEXT which are embedded subtitles when you look at the information for the file. These files were recorded using Channels or PlayOn, then shrunk to HEVC .mp4 files using MCEbuddy.
The only way to view subtitles in Channels is with files which were recorded using the DVR feature. I don't use that DVR feature except to record the files, which I then trim using Avidemux and save to .mp4, then I shrink the files using MCEbuddy, which extracts the subtitles then reinserts them in the final HEVC .mp4 file as MOV-TEXT subtitles.
Is there some reason why Channels won't display subtitles for these .mp4 files in my library but Plex will?