Nicovideo - Unable to extract thumbPlayKey;

[IrealiTY]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.12.01. 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 Issues with outdated version will be rejected.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 2016.12.01

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• Bug report (encountered problems with youtube-dl)
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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:

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 ```):

C:\Users\aleks\Downloads>youtube-dl.exe -v http://www.nicovideo.jp/watch/sm5473120
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', 'http://www.nicovideo.jp/watch/sm5473120']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2016.12.01
[debug] Python version 3.4.4 - Windows-10-10.0.14393
[debug] exe versions: none
[debug] Proxy map: {}
[niconico] sm5473120: Downloading webpage
[niconico] sm5473120: Downloading video info page
[niconico] sm5473120: Downloading webpage
ERROR: Unable to extract thumbPlayKey; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\YoutubeDL.py", line 694, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\common.py", line 357, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\niconico.py", line 141, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\common.py", line 660, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract thumbPlayKey; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

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• Single video: http://www.nicovideo.jp/watch/sm5473120

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Description of your issue, suggested solution and other information

I'm not sure if the listed support on the website for:

• niconico: ニコニコ動画
• NiconicoPlaylist

is also accounting for NicoVideo as it seems they rebranded / changed how the service works.

[dstftw]

Duplicate of #11170.