[npo] Download livestreams from npostart.nl domain

[barbeque-squared]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.12.17. 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 Issues with outdated version will be rejected.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 2018.12.17

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

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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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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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: ['--all-subs', '--embed-subs', '--limit-rate', '5M']
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.npostart.nl/live/npo-1']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.12.17
[debug] Python version 3.7.1 (CPython) - Linux-4.19.2-arch1-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg n4.1, ffprobe n4.1, rtmpdump 2.4
[debug] Proxy map: {}
[generic] npo-1: Requesting header
WARNING: Falling back on generic information extractor.
[generic] npo-1: Downloading webpage
[generic] npo-1: Extracting information
ERROR: Unsupported URL: https://www.npostart.nl/live/npo-1
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/YoutubeDL.py", line 793, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 508, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/generic.py", line 3323, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.npostart.nl/live/npo-1

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Description of your issue, suggested solution and other information

• npo1.nl redirects to https://www.npostart.nl/live/npo-1
• the following does work: youtube-dl https://www.npo.nl/live/npo-1 (it goes through the npo plugin) but with npo.nl also redirecting to npostart.nl, it'll become hard to figure out.

Other npo livestream urls (for television):

• https://www.npostart.nl/live/npo-2

https://www.npostart.nl/live also lists other urls, but I don't know if those are always available.