Command:

"-y -i m3u8playlist -c copy -bsf:a aac_adtstoasc save.mp4"

Console output:

ffmpeg version N-71042-g83020f8 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (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-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  libavutil      54. 20.100 / 54. 20.100
  libavcodec     56. 29.100 / 56. 29.100
  libavformat    56. 26.101 / 56. 26.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 13.101 /  5. 13.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[mpegts @ 02f4f4a0] Could not find codec parameters for stream 0 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls,applehttp @ 029496e0] Could not find codec parameters for stream 0 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, hls,applehttp, from 'vod.ak.hls.ttvnw[dot]net/v1/AUTH_system/vods_6a13/forcefulfalcon_13673600960_221134116/low/index-dvr.m3u8':
  Duration: 03:47:44.92, start: 65.816000, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 0
    Stream #0:0: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp -- there is an audio channel, but not for 5/10 mins
    Stream #0:1: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x360, 60 tbr, 90k tbn, 2k tbc
    Stream #0:2: Data: timed_id3 (ID3  / 0x20334449)
Output #0, mp4, to 'Z:\Downloads\Twitch\b.mp4':
  Metadata:
    encoder         : Lavf56.26.101
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x360, q=2-31, 60 tbr, 90k tbn, 90k tbc
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=  231 fps=184 q=-1.0 size=     318kB time=00:01:13.46 bitrate=  35.4kbits/s
frame=  318 fps=170 q=-1.0 size=     482kB time=00:01:16.36 bitrate=  51.7kbits/s
frame=  368 fps=152 q=-1.0 size=     586kB time=00:01:18.03 bitrate=  61.5kbits/s
Stopped