# ffmpeg -ss 10 -i $(youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4' --get-url https://www.youtube.com/watch?v=FoTsbrPxP8I) -t 10 -c:v copy -c:a copy testvid.mp4
WARNING: unable to extract uploader nickname
ffmpeg version 3.3.4-1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7 (Debian 7.2.0-4)
  configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://r2---sn-jtu5bgxxjx-5uis.googlevideo.com/videoplayback?id=1684ec6eb3f13fc2&itag=135&source=youtube&requiressl=yes&pl=16&initcwndbps=565000&mv=m&ms=au&mn=sn-jtu5bgxxjx-5uis&mm=31&pcm2cms=yes&ei=74HJWZ2wFZWZWPWZnNgN&ratebypass=yes&mime=video/mp4&gir=yes&clen=22267226&lmt=1480146626325700&dur=189.760&key=dg_yt0&signature=1D394B084F600F46E88457EDDBBBAE052DF7F705.5DD1CDF6DA0E5DD98BFCA56901BF952531CE9E4D&mt=1506378102&ip=176.92.92.88&ipbits=0&expire=1506399823&sparams=ip,ipbits,expire,id,itag,source,requiressl,pl,initcwndbps,mv,ms,mn,mm,pcm2cms,ei,ratebypass,mime,gir,clen,lmt,dur':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    creation_time   : 2016-11-26T07:50:24.000000Z
  Duration: 00:03:09.76, start: 0.000000, bitrate: 938 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 852x480 [SAR 1:1 DAR 71:40], 14 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2016-11-26T07:50:24.000000Z
      handler_name    : VideoHandler
[NULL @ 0x564cf0cdbaa0] Unable to find a suitable output format for 'https://r2---sn-jtu5bgxxjx-5uis.googlevideo.com/videoplayback?id=1684ec6eb3f13fc2&itag=140&source=youtube&requiressl=yes&pl=16&initcwndbps=565000&mv=m&ms=au&mn=sn-jtu5bgxxjx-5uis&mm=31&pcm2cms=yes&ei=74HJWZ2wFZWZWPWZnNgN&ratebypass=yes&mime=audio/mp4&gir=yes&clen=3015473&lmt=1480133239302273&dur=189.823&key=dg_yt0&signature=5F5D0C1E9B3F3B6391F62BE7E7F174B2A3B12536.1D9274D3F680BC293E2148514F1A34050CA39731&mt=1506378102&ip=176.92.92.88&ipbits=0&expire=1506399823&sparams=ip,ipbits,expire,id,itag,source,requiressl,pl,initcwndbps,mv,ms,mn,mm,pcm2cms,ei,ratebypass,mime,gir,clen,lmt,dur'
https://r2---sn-jtu5bgxxjx-5uis.googlevideo.com/videoplayback?id=1684ec6eb3f13fc2&itag=140&source=youtube&requiressl=yes&pl=16&initcwndbps=565000&mv=m&ms=au&mn=sn-jtu5bgxxjx-5uis&mm=31&pcm2cms=yes&ei=74HJWZ2wFZWZWPWZnNgN&ratebypass=yes&mime=audio/mp4&gir=yes&clen=3015473&lmt=1480133239302273&dur=189.823&key=dg_yt0&signature=5F5D0C1E9B3F3B6391F62BE7E7F174B2A3B12536.1D9274D3F680BC293E2148514F1A34050CA39731&mt=1506378102&ip=176.92.92.88&ipbits=0&expire=1506399823&sparams=ip,ipbits,expire,id,itag,source,requiressl,pl,initcwndbps,mv,ms,mn,mm,pcm2cms,ei,ratebypass,mime,gir,clen,lmt,dur: Invalid argument