can I download silverlight videos?

[mfrasca]

• I've verified and I assure that I'm running youtube-dl 2018.07.21

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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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 ```):

mario@rune:~$ youtube-dl --verbose "http://www.rai.it/dl/RaiTV/programmi/media/ContentItem-b63a4089-ac28-48cf-bca5-9f5b5bc46df5.html"
[debug] System config: []
[debug] User config: [u'--prefer-ffmpeg', u'--ignore-errors', u'--prefer-free-formats']
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'http://www.rai.it/dl/RaiTV/programmi/media/ContentItem-b63a4089-ac28-48cf-bca5-9f5b5bc46df5.html']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.07.21
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-7-amd64-x86_64-with-debian-9.5
[debug] exe versions: avconv 3.2.11-1, avprobe 3.2.11-1, ffmpeg 3.2.11-1, ffprobe 3.2.11-1, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[Rai] b63a4089-ac28-48cf-bca5-9f5b5bc46df5: Downloading webpage
[Rai] b63a4089-ac28-48cf-bca5-9f5b5bc46df5: Downloading video JSON
[Rai] b63a4089-ac28-48cf-bca5-9f5b5bc46df5: Downloading XML metadata for platform mon
ERROR: Unable to extract relinker URL; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/rai.py", line 457, in _real_extract
    return self._extract_from_content_id(content_item_id, url)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/rai.py", line 391, in _extract_from_content_id
    relinker_info = self._extract_relinker_info(media['mediaUri'], content_id)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/rai.py", line 46, in _extract_relinker_info
    headers=self.geo_verification_headers())
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 809, in _download_xml
    expected_status=expected_status)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 787, in _download_xml_handle
    expected_status=expected_status)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 627, in _download_webpage_handle
    urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal, data=data, headers=headers, query=query, expected_status=expected_status)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 612, in _request_webpage
    raise ExtractorError(errmsg, sys.exc_info()[2], cause=err)
ExtractorError: Unable to download XML: <urlopen error unknown url type: mms> (caused by URLError(u'unknown url type: mms',))
Traceback (most recent call last):
  File "/home/mario/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 502, in extract
    ie_result = self._real_extract(url)
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/rai.py", line 475, in _real_extract
    webpage, 'relinker URL', group='url')
  File "/home/mario/bin/youtube-dl/youtube_dl/extractor/common.py", line 972, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract relinker URL; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

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Description of your issue, suggested solution and other information

I wish to download the video contained in the page, the web page says I should install microsoft silverlight, which I haven't. I thought I would give it a try anyway, and youtube-dl stops on a mms link. I have looked for mms references in the docs and only found that I should have mplayer, which I have. I didn't find 'silverlight' in the FAQ, I did find it in some 8 issues.