Downloading Youtube private video with cookiefile no longer works

[dkess]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.09.11. 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 Issues with outdated version will be rejected.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 2017.09.11

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• At least skimmed through the README, most notably the 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:

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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--cookies', 'cookies.txt', 'https://youtu.be/sdYucbUu_sw']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.09.11
[debug] Python version 3.6.2 - Linux-4.12.12-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 3.3.3, ffprobe 3.3.3, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] sdYucbUu_sw: Downloading webpage
[youtube] sdYucbUu_sw: Downloading embed webpage
[youtube] sdYucbUu_sw: Refetching age-gated info webpage
ERROR: sdYucbUu_sw: YouTube said: This video is private.
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 776, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 434, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1608, in _real_extract
    expected=True, video_id=video_id)
youtube_dl.utils.ExtractorError: sdYucbUu_sw: YouTube said: This video is private.

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Description of your issue, suggested solution and other information

My university hosts webcast lectures on Youtube, but requires being logged in as the correct user. In the past I have been able to use a cookies.txt file (from this Chrome extension) to download the video through youtube-dl. However I am now given the error: "This video is private."

[dkess]

After some experimentation I've determined that this is not a youtube-dl bug. Using this script with Firefox I have been able to download videos again.