List of subtitles

[embryo10]

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Description of your issue, suggested solution and other information

I use youtube-dl as a library in a python program.
Everything works ok exept the subtitles.
I can not get the subtitle info from any video.
Tried with a youtube one https://www.youtube.com/watch?v=8jPQjjsBbIc that it contains a lot of them.
Using

ydl_opts = {'listsubtitles': True, "logger": logger,}
        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(self.link, download=False)
            return info

returns None
If I don't use the listsubtitles key, I get the info dict as expected.
I searched the net for this and I found this answer and nothing else.
I must be doing something wrong, but I don't know what....
Any ideas on how to get the subtitle's list and how to download a specific one (this is the second thing I have to do after listing the subtitles)

[dstftw]

1. {'writesubtitles': True}.
2. {'subtitleslangs': list of langs, 'skip_download': True}.

[embryo10]

@dstftw Thank you.