Twitch live stream fails with python 3.

[miseran]

When trying to download a twitch live stream in python 3, downloading the m3u8 information often (but not always) fails due to an HTTP 403 error. From what I can tell, the bug is around line 367 of twitch.py. The expression compat_urllib_parse.urlencode(query).encode('utf-8') gives a bytes object, which is inserted into the format string as b'whatever', giving an invalid URL. For example, such an URL might be

http://usher.twitch.tv/api/channel/hls/riotgames.m3u8?b'token=%7B%22user_id%22%3Anull%2C%22channel%22%3A%22riotgames%22%2C%22expires%22%3A1425767945%2C%22chansub%22%3A%7B%22view_until%22%3A1924905600%2C%22restricted_bitrates%22%3A%5B%5D%7D%2C%22private%22%3A%7B%22allowed_to_view%22%3Atrue%7D%2C%22privileged%22%3Afalse%2C%22source_restricted%22%3Afalse%7D&p=7037332&player=twitchweb&segment_preference=4&allow_source=true&sig=624caab07ed41674af64fdfed06c0687ec11b5d5'

Removing the .encode('utf-8') seems to work, but I'm not sure if it breaks anything else.
I have also attached the output of the program below.

$ python3.4 -m youtube_dl --verbose 'http://www.twitch.tv/riotgames'
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'http://www.twitch.tv/riotgames']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.03.03.1
[debug] Git HEAD: 23ba76b
[debug] Python version 3.4.3 - Darwin-13.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.5.4, ffprobe 2.5.4, rtmpdump 2.4
[debug] Proxy map: {}
[twitch:stream] riotgames: Downloading stream JSON
[twitch:stream] riotgames: Downloading channel access token
[twitch:stream] riotgames: Downloading m3u8 information
ERROR: Failed to download m3u8 information: HTTP Error 403: ERROR (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "/private/tmp/tmp.B5NcE/youtube-dl/youtube_dl/extractor/common.py", line 314, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/private/tmp/tmp.B5NcE/youtube-dl/youtube_dl/YoutubeDL.py", line 1674, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 469, in open
    response = meth(req, response)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 579, in http_response
    'http', request, response, code, msg, hdrs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 507, in error
    return self._call_chain(*args)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 441, in _call_chain
    result = func(*args)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/urllib/request.py", line 587, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)

[dstftw]

This will be fixed in the next version. Thanks for the report.