Comment 11 for bug 1266311

youtube-dl fails to download the video:
$ youtube-dl -c -t "https://www.youtube.com/watch?v=NAdYtnQK3-I"
[youtube] Setting language
[youtube] NAdYtnQK3-I: Downloading video webpage
[youtube] NAdYtnQK3-I: Downloading video info webpage
[youtube] NAdYtnQK3-I: Extracting video information
Traceback (most recent call last):
  File "/usr/bin/youtube-dl", line 4645, in <module>
    main()
  File "/usr/bin/youtube-dl", line 4636, in main
    _real_main()
  File "/usr/bin/youtube-dl", line 4620, in _real_main
    retcode = fd.download(all_urls)
  File "/usr/bin/youtube-dl", line 869, in download
    ie.extract(url)
  File "/usr/bin/youtube-dl", line 1135, in extract
    return self._real_extract(url)
  File "/usr/bin/youtube-dl", line 1406, in _real_extract
    url_map = dict((ud['itag'][0], ud['url'][0] + '&signature=' + ud['sig'][0]) for ud in url_data)
  File "/usr/bin/youtube-dl", line 1406, in <genexpr>
    url_map = dict((ud['itag'][0], ud['url'][0] + '&signature=' + ud['sig'][0]) for ud in url_data)
KeyError: 'sig'