Can't download from rbb-online.de

[cboltz]

• I've verified and I assure that I'm running youtube-dl 2018.12.17
• 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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# youtube-dl -v https://www.rbb-online.de/maerchenfilm/archiv/allerleirauh/allerleirauh.html
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.rbb-online.de/maerchenfilm/archiv/allerleirauh/allerleirauh.html']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.12.17
[debug] Python version 2.7.15 (CPython) - Linux-4.19.8-1-default-x86_64-with-glibc2.2.5
[debug] exe versions: ffmpeg 4.1, ffprobe 4.1
[debug] Proxy map: {}
[generic] allerleirauh: Requesting header
WARNING: Falling back on generic information extractor.
[generic] allerleirauh: Downloading webpage
[generic] allerleirauh: Extracting information
ERROR: Unsupported URL: https://www.rbb-online.de/maerchenfilm/archiv/allerleirauh/allerleirauh.html
Traceback (most recent call last):
  File "/usr/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2340, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/bin/youtube-dl/youtube_dl/compat.py", line 2542, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/usr/bin/youtube-dl/youtube_dl/compat.py", line 2531, in _XML
    parser.feed(text)
  File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1659, in feed
    self._raiseerror(v)
  File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1523, in _raiseerror
    raise err
ParseError: undefined entity: line 36, column 0
Traceback (most recent call last):
  File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 793, in extract_info
    ie_result = ie.extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 508, in extract
    ie_result = self._real_extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3323, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://www.rbb-online.de/maerchenfilm/archiv/allerleirauh/allerleirauh.html

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example URLs

• Single video: https://www.rbb-online.de/maerchenfilm/archiv/allerleirauh/allerleirauh.html
• Single video: https://www.rbb-online.de/maerchenfilm/archiv/aschenputtel/aschenputtel.html
• Overview page (the first ~10 links point to a page with a video, the others only to the video description): https://www.rbb-online.de/maerchenfilm/archiv/sechs_auf_einen_streich.html

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Description of your issue, suggested solution and other information

Please add support to download videos from the rbb-online.de page.

(Workaround: rbb belongs to ARD, so if you are lucky, ardmediathek.de will also have the movies.)