#ffmpeg -devices

ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 6 (SUSE Linux)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --incdir=/usr/include/ffmpeg --extra-cflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -g' --optflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -g' --disable-htmlpages --enable-pic --disable-stripping --enable-shared --disable-static --enable-runtime-cpudetect --enable-gpl --disable-openssl --enable-avresample --enable-libcdio --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcelt --enable-libcdio --enable-libdc1394 --enable-libfreetype --enable-libgsm --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-pic --enable-pthreads --enable-vaapi --enable-vdpau --enable-libmp3lame --enable-libtwolame --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libavresample   3.  0.  0 /  3.  0.  0
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 --
 DE alsa            ALSA audio output
 D  dv1394          DV1394 A/V grab
 DE fbdev           Linux framebuffer
 D  jack            JACK Audio Connection Kit
 D  lavfi           Libavfilter virtual input device
 D  libcdio
 D  libdc1394       dc1394 v.2 A/V grab
 DE oss             OSS (Open Sound System) playback
 DE pulse           Pulse audio output
  E sdl             SDL output device
  E v4l2            Video4Linux2 output device
 D  video4linux2,v4l2 Video4Linux2 device grab
 D  x11grab         X11 screen capture, using XCB