YouTube said: <a href ...

[Khang-NT]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.07. 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 Issues with outdated version will be rejected.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 2017.02.07

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

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$ youtube-dl -j u9Crsd1Z90k -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-j', 'u9Crsd1Z90k', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.02.07
[debug] Python version 3.5.2 - Darwin-16.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.1.3, ffprobe 3.1.3
[debug] Proxy map: {}
ERROR: u9Crsd1Z90k: YouTube said: <a href="http://www.youtube.com/watch?v=u9Crsd1Z90k&feature=player_embedded" target="_blank">Watch this video on YouTube.</a>
Playback on other websites has been disabled by the video owner.
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 696, in extract_info
    ie_result = ie.extract(url)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 369, in extract
    return self._real_extract(url)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1385, in _real_extract
    expected=True, video_id=video_id)
youtube_dl.utils.ExtractorError: u9Crsd1Z90k: YouTube said: <a href="http://www.youtube.com/watch?v=u9Crsd1Z90k&feature=player_embedded" target="_blank">Watch this video on YouTube.</a>
Playback on other websites has been disabled by the video owner.

No idea for this error, maybe some cases haven't handled yet.

[ThomasChr]

Same problem here.

[dstftw]

This video requires authentication.

[Khang-NT]

YouTube-DL detects age-restricted content, but when I skip this check, it works without problem.

So I think, it's better to skip the step handle "age-restricted content" if possible.
https://github.com/Khang-NT/youtube-dl/blob/master/youtube_dl/extractor/youtube.py#L1305-L1376

To do that, just do "get video info" first. Then if "get video info" success, we can skip "age-restricted" block.

if not video_info and re.search(r'player-age-gate-content">', video_webpage) is not None:
     ...

Is it correct?