I have subtitles imbedded in my files. all mp4/m4v.
Is there a way to mark a set of subtitles as forced so that automatically play?
There probably is. But Plex is not able to recognise this information.
And I haven’t found a single software solution to embed this information into mp4/m4v files either.
So currently, Plex can only recognise the ‘forced’ flag on subtitles in MKV containers and on external subtitles. How: https://support.plex.tv/articles/200471133-adding-local-subtitles-to-your-media/
Then activate “Automatically Select Audio and Subtitle Tracks”
and select your subtitle language and “Shown with Foreign Audio”
https://support.plex.tv/articles/204985278-account-audio-subtitle-language-settings/
Subler, subler.org, will let you set the forced flag for subtitles in mp4 files. Subler is Mac only. I’m not aware of Windows or Linux s/w with similar capabilities.
As @OttoKerner notes, Plex does not recognize the flag in mp4 containers. The subtitles appear as standard, non-forced subtitles.
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