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AttributeError: 'list' object has no attribute 'lower'

See original GitHub issue

I seem to consistently get the following error, when running Subliminal against my movies or series, using pretty much just a standard run (subliminal download -l en -l da /path/to).

Here is the output:

Downloading subtitles  [#####################---------------]   59%  0d 02:48:08  Two and a Half Men - S04E02 - Who's Vod Kanockers - 720p WEB-DL.mkv
Traceback (most recent call last):
  File "/volume1/@appstore/py3k/usr/local/bin/subliminal", line 11, in <module>
    sys.exit(subliminal())
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/click/decorators.py", line 27, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/cli.py", line 403, in download
    hearing_impaired=hearing_impaired, only_one=single)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/core.py", line 211, in download_best_subtitles
    for s in subtitles], key=operator.itemgetter(1), reverse=True)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/core.py", line 211, in <listcomp>
    for s in subtitles], key=operator.itemgetter(1), reverse=True)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/score.py", line 106, in compute_score
    matches = subtitle.get_matches(video)
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/providers/opensubtitles.py", line 78, in get_matches
    matches |= guess_matches(video, guessit(self.movie_release_name, {'type': 'episode'}))
  File "/volume1/@appstore/py3k/usr/local/lib/python3.5/site-packages/subliminal/subtitle.py", line 235, in guess_matches
    if video.format and 'format' in guess and not isinstance(guess['format'], list) and guess['format'].lower() == video.format.lower():
AttributeError: 'list' object has no attribute 'lower'

Seems to be related to having two formats attached to it. The best I have been able to google myself to is: https://github.com/pymedusa/Medusa/issues/1033, which fixed the issue by changing code in their software and not in subliminal itself.

I have attached a debug with one of the files that I can reproduce it with without fail.

debug.txt

Very surprised no one else have run into this issue.