'sig' is not recognized as an internal or external command, operable program or batch file.

[evildog1]

Note: This live stream will end soon, so please test it on other videos

Summary of the bug:
I was trying to download .m3u8 from twitch.tv but it gives me HTTP 403 (access denied) and 'sig' is not recognized as an internal or external command, operable program or batch file.

How to reproduce:

% ffmpeg -i http://video19.fra01.hls.ttvnw.net/hls-6ecba8/ultra_20307291600_420900398/high/py-index-live.m3u8?token=id=6573161524407972767,bid=20307291600,exp=1458499536,node=video19-1.fra01.hls.justin.tv,nname=video19.fra01,fmt=high&sig=f28b39c64f3e32add335dc4ec4f8c226f4b1c352 -c copy mpegts.ts
ffmpeg version 3.0
built on Windows

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

Command output:

ffmpeg version N-79075-ga7b8a6e Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 28.103 / 57. 28.103
  libavformat    57. 28.102 / 57. 28.102
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 39.102 /  6. 39.102
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[http @ 00000171e9326d20] HTTP error 403 Forbidden
http://video19.fra01.hls.ttvnw.net/hls-6ecba8/ultra_20307291600_420900398/high/py-index-live.m3u8?token=id=6573161524407972767,bid=20307291600,exp=1458499536,node=video19-1.fra01.hls.justin.tv,nname=video19.fra01,fmt=high: Server returned 403 Forbidden (access denied)
'sig' is not recognized as an internal or external command,
operable program or batch file.

[Carl Eugen Hoyos]

Please test with quotation marks.