[Issue] TeamCoco: broken selection with default bestvideo+bestaudio

[wiiaboo]

• I've verified and I assure that I'm running youtube-dl 2017.02.04.1
• At least skimmed through README and most notably 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

---

$ youtube-dl -v --ignore-config "http://teamcoco.com/video/clueless-gamer-super-bowl-for-honor"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--ignore-config', 'http://teamcoco.com/video/clueless-gamer-super-bowl-for-honor']
[debug] Encodings: locale cp1252, fs utf-8, out utf-8, pref cp1252
[debug] youtube-dl version 2017.02.04.1
[debug] Python version 3.6.0 - Windows-10-10.0.14393-SP0
[debug] exe versions: ffmpeg N-83415-g012dd8c99a, ffprobe N-83415-g012dd8c99a, rtmpdump 2.4-20151223-gfa8646d-LibreSSL_2.3.4-x86_64-static
[debug] Proxy map: {}
[Teamcoco] clueless-gamer-super-bowl-for-honor: Downloading webpage
[Teamcoco] Try to compute possible data sequence. This may take some time.
[Teamcoco] 98599: Downloading m3u8 information
ERROR: Both formats 2374 and 71 are video-only, you must specify "-f video+audio"
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Ricardo\AppData\Local\Programs\Python\Python36\Scripts\youtube-dl.exe\__main__.py", line 9, in <module>
    sys.exit(main())
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\__init__.py", line 452, in main
    _real_main(argv)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\__init__.py", line 442, in _real_main
    retcode = ydl.download(all_urls)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1796, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 707, in extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 753, in process_ie_result
    return self.process_video_result(ie_result, download=download)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1429, in process_video_result

    formats_to_download = list(format_selector(ctx))
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1074, in selector_function
    for format in f(ctx):
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1193, in final_selector
    return selector_function(ctx_copy)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1084, in selector_function
    picked_formats = list(f(ctx))
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1185, in selector_function
    yield _merge(pair)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 1157, in _merge
    % (format_1, format_2))
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 570, in report_error
    self.trouble(error_message, tb)
  File "c:\users\ricardo\appdata\local\programs\python\python36\lib\site-packages\youtube_dl\YoutubeDL.py", line 532, in trouble
    tb_data = traceback.format_list(traceback.extract_stack())

---

Looking at -F output and -j/-J output, default -f bestvideo+bestaudio is likely failing because format_id 71 has both acodec="none" and vcodec="none":

$ youtube-dl --ignore-config -F "http://teamcoco.com/video/clueless-gamer-super-bowl-for-honor"
[Teamcoco] clueless-gamer-super-bowl-for-honor: Downloading webpage
[Teamcoco] Try to compute possible data sequence. This may take some time.
[Teamcoco] 98599: Downloading m3u8 information
[info] Available formats for 98599:
format code      extension  resolution note
meta             mp4        multiple   Quality selection URL
audio-0-Default  mp4        audio only
audio-1-Default  mp4        audio only
71               mp4        audio only   71k , video only
413              mp4        400x224     413k , avc1.42001e, video only
522              mp4        400x224     522k , avc1.42001e, video only
1205             mp4        640x360    1205k , avc1.4d001e, video only
2374             mp4        1024x576   2374k , avc1.4d001f, video only
false-0          mp4        unknown
false-1          mp4        unknown
false-2          mp4        unknown
500k             mp4        unknown    (best)