ERROR: Unable to download video webpage: HTTP Error 404: Not Found

[kenorb]

$ youtube-dl -vcti --write-description --write-info-json --all-subs --write-thumbnail -R5 http://www.youtube.com/NASA
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-vcti', '-R5', '--write-description', '--write-info-json', '--all-subs', '--write-thumbnail', '-vcti', '--write-description', '--write-info-json', '--all-subs', '--write-thumbnail', '-R5', 'http://www.youtube.com/NASA']
[debug] youtube-dl version 2013.07.17.1
[debug] Python version 2.7.4 - Linux-3.8.0-26-generic-i686-with-Ubuntu-13.04-raring
[debug] Proxy map: {}
[youtube] Setting language
WARNING: unable to set language: <urlopen error [Errno 8] _ssl.c:504: EOF occurred in violation of protocol>
[youtube] NASA: Downloading video webpage
ERROR: Unable to download video webpage: HTTP Error 404: Not Found; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 414, in _real_extract
    video_webpage_bytes = compat_urllib_request.urlopen(request).read()
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 404: Not Found
Traceback (most recent call last):
  File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 312, in extract_info
    ie_result = ie.extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 96, in extract
    return self._real_extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 416, in _real_extract
    raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
ExtractorError: Unable to download video webpage: HTTP Error 404: Not Found; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output.

[kenorb]

Actually this URL seems to work: http://www.youtube.com/user/NASAgovVideo
but not that one: http://www.youtube.com/NASA

[jaimeMF]

Duplicate of #1069, even if the error messages are different, the problem is the same: user urls in the form youtube.com/user are interpreted as video urls.