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[root@Shoofly alarm]# ffmpeg -f v4l2 -input_format mjpeg -video_size 1920x1080 -i /dev/video0 -c:v h264_omx out.mp4
ffmpeg version git-2017-10-23-acf7063 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.2.0 (GCC)
  configuration: --enable-gpl --enable-nonfree --enable-mmal --enable-omx --enable-omx-rpi
  libavutil      56.  0.100 / 56.  0.100
  libavcodec     58.  0.100 / 58.  0.100
  libavformat    58.  0.100 / 58.  0.100
  libavdevice    58.  0.100 / 58.  0.100
  libavfilter     7.  0.100 /  7.  0.100
  libswscale      5.  0.100 /  5.  0.100
  libswresample   3.  0.100 /  3.  0.100
  libpostproc    55.  0.100 / 55.  0.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 68949.601961, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (h264_omx))
Press [q] to stop, [?] for help
[swscaler @ 0x3421060] deprecated pixel format used, make sure you did set range correctly
[h264_omx @ 0x33f0220] Using OMX.broadcom.video_encode
[h264_omx @ 0x33f0220] OMX error 80001000
[h264_omx @ 0x33f0220] err 80001018 (-2147479528) on line 561
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!