[Youtube] Some subtitles not found

[sehrgut]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.06.18. 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 Issues with outdated version will be rejected.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 2017.06.18

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• 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)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Thu Jun 22 13:34:11 Downloads>youtube-dl -v --list-subs 'https://www.youtube.com/watch?v=3ujWVbjKBCo'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'--list-subs', u'https://www.youtube.com/watch?v=3ujWVbjKBCo']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.06.18
[debug] Python version 2.7.11 - Darwin-14.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.3, ffprobe 3.2.3, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] 3ujWVbjKBCo: Downloading webpage
[youtube] 3ujWVbjKBCo: Downloading video info webpage
[youtube] 3ujWVbjKBCo: Extracting video information
WARNING: video doesn't have subtitles
[youtube] 3ujWVbjKBCo: Looking for automatic captions
WARNING: Couldn't find automatic captions for 3ujWVbjKBCo
[youtube] 3ujWVbjKBCo: Downloading MPD manifest
3ujWVbjKBCo has no automatic captions
3ujWVbjKBCo has no subtitles

Description of your issue, suggested solution and other information

The video above has subtitles which are visible on YouTube, and are discovered by ccsubs.com. However, the youtube extractor does not discover these subtitles.