6play subtitles not available / listed

[boulderob]

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when i watch the file at this link online https://www.6play.fr/scenes-de-menages-p_829/Episodes-du-07-fevrier-c_11885425, it works fine with and without subtitles. the subtitles appear to be generated from an underlying text file (not automatically generated) synced to the playback b/c they are superimposed on top of the video and not "burned" into the video file itself (ie. it's pretty easy to tell when there is an actual underlying subtitle file vs the subtitles being baked into the video itself).

however, when i try to list the subtitles for this video and others on the site that have subtitles i don't see any per :

# youtube-dl --list-subs https://www.6play.fr/scenes-de-menages-p_829/Episodes-du-07-fevrier-c_11885425
[6play] 11885425: Downloading JSON metadata
[6play] 11885425: Downloading m3u8 information
[6play] 11885425: Downloading m3u8 information
11885425 has no subtitles

since it appears there is an underlying subtitle text file there, i would like to know if this is a bug that should be fixed or added as a feature request? or perhaps youtube-dl wasn't meant to support subtitle downloads for all sites by default?

i'm assuming that the underlying subtitle file is available either directly from a site's api or via some other youtube-dl discovery method since the subtitle text file has to stream in order to work at run-time. but maybe these are wrong assumptions.