ffmpeg -f v4l2 -list_formats all -i /dev/video0

[video4linux2,v4l2 @ 0x1a9c250] Raw : yuyv422 : YUYV 4:2:2 : 640x480 160x120 176x144 320x180 320x240 352x288 424x240 480x270 640x360 800x448 800x600 848x480 960x540 1024x576 1280x720 1600x896 1920x1080 2304x1296 2304x1536
[video4linux2,v4l2 @ 0x1a9c250] Compressed: mjpeg : Motion-JPEG : 640x480 160x120 176x144 320x180 320x240 352x288 424x240 480x270 640x360 800x448 800x600 848x480 960x540 1024x576 1280x720 1600x896 1920x1080
/dev/video0: Immediate exit requested



ffmpeg -f v4l2 -video_size 1920x1080 -i /dev/video0 -r 10 -f rtsp rtsp://localhost:8554/unicast

Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 12474.865322, bitrate: 165888 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn, 1000k tbc
Output #0, rtsp, to 'rtsp://localhost:8554/unicast':
  Metadata:
    encoder         : Lavf57.56.101
    Stream #0:0: Video: mpeg4, yuv420p, 1920x1080, q=2-31, 200 kb/s, 10 fps, 90k tbn, 10 tbc
    Metadata:
      encoder         : Lavc57.64.101 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))