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[root@Shoofly alarm]# ffmpeg -f v4l2 -input_format mjpeg -video_size 1920x1080 -i /dev/video0 -c:v h264_omx -pix_fmt yuv420p 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: 305.628944, 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 @ 0x2a3a230] deprecated pixel format used, make sure you did set range correctly
[h264_omx @ 0x2a08230] Using OMX.broadcom.video_encode
Output #0, mp4, to 'out.mp4':
  Metadata:
    encoder         : Lavf58.0.100
    Stream #0:0: Video: h264 (h264_omx) (avc1 / 0x31637661), yuv420p, 1920x1080, q=2-31, 200 kb/s, 30 fps, 15360 tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.0.100 h264_omx
frame=   22 fps=2.8 q=-0.0 Lsize=      41kB time=00:00:00.70 bitrate= 481.6kbits/s dup=2 drop=0 speed=0.0906x
video:40kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.182083%
[root@Shoofly alarm]#