> ./ffmpeg -devices

ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 6 (SUSE Linux)
  configuration: --enable-decklink --extra-cflags=-I/home/operator/Downloads/ffmpeg-3.0.2/include/ --extra-ldflags=-ldl --extra-libs=-ldl
  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
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 --
 DE decklink        Blackmagic DeckLink output
 D  dv1394          DV1394 A/V grab
 DE fbdev           Linux framebuffer
 D  lavfi           Libavfilter virtual input device
 DE oss             OSS (Open Sound System) playback
  E v4l2            Video4Linux2 output device
 D  video4linux2,v4l2 Video4Linux2 device grab