streamer@pine64:~$ ffmpeg -v verbose -f alsa -ac 1 -i hw:1 -r 5 -s 640x480 -f video4linux2 -i /dev/video0 http://myst:1235/cam1.ffm
ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) 20160609
  configuration:
  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
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
Unknown input format: 'alsa'
streamer@pine64:~$