Unable to download videos from http://channel.nationalgeographic.com.

[antdude]

Example:

$ youtube-dl -v "http://channel.nationalgeographic.com/u/kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg/"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'http://channel.nationalgeographic.com/u/kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.03.26.1
[debug] Python version 3.4.2 (CPython) - Linux-3.16.0-5-amd64-x86_64-with-debian-8.10
[debug] exe versions: ffmpeg 3.2.10-1, ffprobe 3.2.10-1, rtmpdump 2.4
[debug] Proxy map: {}
[generic] kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg: Requesting header
WARNING: Falling back on generic information extractor.
[generic] kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg: Downloading webpage
[generic] kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg: Extracting information
ERROR: Unsupported URL: http://channel.nationalgeographic.com/u/kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg/
Traceback (most recent call last):
File "/home/ant/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 785, in extract_info
ie_result = ie.extract(url)
File "/home/ant/bin/youtube-dl/youtube_dl/extractor/common.py", line 440, in extract
ie_result = self._real_extract(url)
File "/home/ant/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3143, in _real_extract
raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: http://channel.nationalgeographic.com/u/kcOIVhcWjca1n65QtmFg_5vIMZ9j1S1CXT46o65HkAANx6SUvJvQAQfYjGC0CkQwGNSgnX54f2aoFg/

Thank you in advance. :)

[kenavera]

This is due to a change in url format. I proposed a fix in the referenced pull request.