[frost@frost-pc Desktop]$ wget -q -O - "https://www.youtube.com/watch?v=HN5NEoziELY" | grep "videoplayback" | sed 's/", "/"\n"/g' | grep "url_encoded_fmt_stream_map" | sed 's/\".*\": //g; s/\"//g; s/,/\n/g; s/\\u0026/\n/g' | grep -E "quality|url|sig" | echo -e $(sed 's/%/\\x/g') | sed 's/ /\n/g; s/sig/\&signature/g'
&signature=B9BB2BBADEA8D4922BC8C3C0E7CF2F7949CC2A46.DC404A49580419B703A0D876BA966CE1A73C13F9
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?fexp=900064%2C936910%2C936913%2C907231%2C921090&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=id%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Cratebypass%2Csource%2Cupn%2Cexpire&key=yt5&ip=213.7.61.69&itag=22&pcm2fr=yes&ipbits=0&sver=3&mt=1389957462&ratebypass=yes&expire=1389983307
quality=hd720
&signature=D207E03EB9FCB7E834106604FCC4F7ED28691DE2.BE204E5C4851011514A5AC737A1EAD57E1191947
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?fexp=900064%2C936910%2C936913%2C907231%2C921090&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=id%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Cratebypass%2Csource%2Cupn%2Cexpire&key=yt5&ip=213.7.61.69&itag=43&pcm2fr=yes&ipbits=0&sver=3&mt=1389957462&ratebypass=yes&expire=1389983307
quality=medium
&signature=A3110BDC432AFD8C85BFAE8A155375E3484241FC.A6F1B4991AF8D3E66DF1D44030296C44461AFF6F
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?fexp=900064%2C936910%2C936913%2C907231%2C921090&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=id%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Cratebypass%2Csource%2Cupn%2Cexpire&key=yt5&ip=213.7.61.69&itag=18&pcm2fr=yes&ipbits=0&sver=3&mt=1389957462&ratebypass=yes&expire=1389983307
quality=medium
&signature=F4B9F884FD01C1DF91FF6EF6C93DC17297549367.1998FE2B3B68C1C402CC972BCA990480AF7A7C3B
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?algorithm=throttle-factor&mt=1389957462&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=algorithm%2Cburst%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Csource%2Cupn%2Cexpire&factor=1.25&key=yt5&ip=213.7.61.69&fexp=900064%2C936910%2C936913%2C907231%2C921090&itag=5&pcm2fr=yes&ipbits=0&sver=3&burst=40&expire=1389983307
quality=small
&signature=BB6C5B6338AAA46154721F314644B53A284C77FE.E9D674C54E377B3E2B67634D013513616AE45A
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?algorithm=throttle-factor&mt=1389957462&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=algorithm%2Cburst%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Csource%2Cupn%2Cexpire&factor=1.25&key=yt5&ip=213.7.61.69&fexp=900064%2C936910%2C936913%2C907231%2C921090&itag=36&pcm2fr=yes&ipbits=0&sver=3&burst=40&expire=1389983307
quality=small
&signature=F0486762A204D4DEAFE5C46921E6569067CC7DDE.91C548FA2D0A98998D112349EA94ED61C0DDF511
url=http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?algorithm=throttle-factor&mt=1389957462&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=algorithm%2Cburst%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Csource%2Cupn%2Cexpire&factor=1.25&key=yt5&ip=213.7.61.69&fexp=900064%2C936910%2C936913%2C907231%2C921090&itag=17&pcm2fr=yes&ipbits=0&sver=3&burst=40&expire=1389983307
quality=small

In the next ffmpeg "-vn" bash: -vn: command not found

[frost@frost-pc Desktop]$ ffmpeg -i http://r8---sn-jtu5-aj5e.googlevideo.com/videoplayback?algorithm=throttle-factor&mt=1389957462&id=1cde4d128ce210b6&upn=fQqEJyFz6Lo&mv=m&source=youtube&ms=au&sparams=algorithm%2Cburst%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Cpcm2fr%2Csource%2Cupn%2Cexpire&factor=1.25&key=yt5&ip=213.7.61.69&fexp=900064%2C936910%2C936913%2C907231%2C921090&itag=5&pcm2fr=yes&ipbits=0&sver=3&burst=40&expire=1389983307 -vn -c:a copy mm.mp3
[2] 7658
[3] 7659
[4] 7660
[5] 7661
[6] 7662
[7] 7663
[8] 7664
[9] 7665
[10] 7666
[11] 7667
[12] 7668
[13] 7669
[14] 7670
[15] 7671
[16] 7672
[17] 7673
[18] 7674
bash: -vn: command not found
[3]   Done                    mt=1389957462
[4]   Done                    id=1cde4d128ce210b6
[5]   Done                    upn=fQqEJyFz6Lo
[6]   Done                    mv=m
[7]   Done                    source=youtube
[12]   Done                    ip=213.7.61.69
[13]   Done                    fexp=900064%2C936910%2C936913%2C907231%2C921090
[14]   Done                    itag=5
[15]   Done                    pcm2fr=yes
[16]   Done                    ipbits=0
[17]   Done                    sver=3
[18]-  Done                    burst=40
[10]   Done                    factor=1.25
[frost@frost-pc Desktop]$ ffmpeg version 2.1.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec 10 2013 06:36:11 with gcc 4.8.2 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --enable-avresample --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  libavutil      52. 48.101 / 52. 48.101
  libavcodec     55. 39.101 / 55. 39.101
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100

And it just hangs and hangs