Repository: youtube-dl
Issue: Curiositystream HTTP Error 422
Labels: account-needed

### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.04.15*. If it's not read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.
- [x] I've **verified** and **I assure** that I'm running youtube-dl **2017.04.15**

### Before submitting an *issue* make sure you have:
- [x] At least skimmed through [README](https://github.com/rg3/youtube-dl/blob/master/README.md) and **most notably** [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections
- [x] [Searched](https://github.com/rg3/youtube-dl/search?type=Issues) the bugtracker for similar issues including closed ones

### What is the purpose of your *issue*?
- [x] 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

Problem with fetching video from curiosity stream. This worked some hours ago... Now I get this message:

```
C:\Users\User\Desktop>youtube-dl https://app.curiositystream.com/video/1348 --username something@gmail.com --password PaSsWoRd --verbose --write-sub --all-subs
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://app.curiositystream.com/video/1348', '--username', 'PRIVATE', '--password', 'PRIVATE', '--verbose', '--write-sub', '--all-subs']
[debug] Encodings: locale cp1252, fs utf-8, out utf-8, pref cp1252
[debug] youtube-dl version 2017.04.15
[debug] Python version 3.6.1 - Windows-10-10.0.14393-SP0
[debug] exe versions: ffmpeg N-85091-g23ae3cc, ffprobe N-85091-g23ae3cc
[debug] Proxy map: {}
[curiositystream] Downloading JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 422: Unprocessable Entity (caused by <HTTPError 422: 'Unprocessable Entity'>); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "c:\program files\python36\lib\site-packages\youtube_dl\extractor\common.py", line 498, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "c:\program files\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 2100, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "c:\program files\python36\lib\urllib\request.py", line 532, in open
    response = meth(req, response)
  File "c:\program files\python36\lib\urllib\request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "c:\program files\python36\lib\urllib\request.py", line 570, in error
    return self._call_chain(*args)
  File "c:\program files\python36\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "c:\program files\python36\lib\urllib\request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
```