Add ElTrece support

[ciroiriarte]

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 2018.01.21. 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 Issues with outdated version will be rejected.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 2018.01.21

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

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:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.eltrecetv.com.ar/programas/simona/capitulos-completos/capitulo-2_099427']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.01.21
[debug] Python version 2.7.13 (CPython) - Linux-4.4.104-18.44-default-x86_64-with-SuSE-42.2-x86_64
[debug] exe versions: ffmpeg 3.3.4, ffprobe 3.3.4
[debug] Proxy map: {}
[generic] capitulo-2_099427: Requesting header
WARNING: Falling back on generic information extractor.
[generic] capitulo-2_099427: Downloading webpage
[generic] capitulo-2_099427: Extracting information
ERROR: Unsupported URL: https://www.eltrecetv.com.ar/programas/simona/capitulos-completos/capitulo-2_099427
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2192, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2541, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2530, in _XML
    parser.feed(text)
  File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1653, in feed
    self._raiseerror(v)
  File "/usr/lib64/python2.7/xml/etree/ElementTree.py", line 1517, in _raiseerror
    raise err
ParseError: not well-formed (invalid token): line 4, column 124
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 784, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 438, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3108, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://www.eltrecetv.com.ar/programas/simona/capitulos-completos/capitulo-2_099427

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Programs index: https://www.eltrecetv.com.ar/capitulos-completos
• Episodes from a single program: https://www.eltrecetv.com.ar/las-estrellas/capitulos-completos
• Episode: https://www.eltrecetv.com.ar/programas/las-estrellas/capitulos-completos/capitulo-171_099424
• Episode link provided for embedding: http://www.eltrecetv.com.ar/node/99424/player.html

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Description of your issue, suggested solution and other information

This is a TV station from Argentina, which publishes already aired shows in UHD.

[ciroiriarte]

There's some work here that might be of interest:

https://github.com/jcodagnone/roku-ar/blob/master/eltrece.py
https://github.com/streamlink/streamlink/blob/master/src/streamlink/plugins/eltrecetv.py

[marium0505]

Would love to see support for eltrecetv added!