[YouTube] Subtitle download is broken

[useretail]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.05.29. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.05.29

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v <your command line>
[[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.05.29
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.8
[debug] exe versions: ffmpeg 2.6.9, ffprobe 2.6.9, rtmpdump 2.4
[debug] Proxy map: {}
<end of log>

If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=yxmfJuC2Uno

Description of your issue, suggested solution and other information

Subtitle download function is broken. I.e.: youtube-dl --all-subs --skip-download https://www.youtube.com/watch?v=yxmfJuC2Uno
Returns WARNING: video doesn't have subtitles, but subs are present

[dstftw]

This video has no subtitles only automatic captions available with--write-auto-sub.