meh  ~  devel  centricular  v4l2-ctl --all -d /dev/video0
Driver Info (not using libv4l2):
	Driver name   : v4l2 loopback
	Card type     : Dummy video device (0x0000)
	Bus info      : platform:v4l2loopback-000
	Driver version: 4.16.9
	Capabilities  : 0x85208003
		Video Capture
		Video Output
		Video Memory-to-Memory
		Read/Write
		Streaming
		Extended Pix Format
		Device Capabilities
	Device Caps   : 0x85208003
		Video Capture
		Video Output
		Video Memory-to-Memory
		Read/Write
		Streaming
		Extended Pix Format
		Device Capabilities
Priority: 0
Video input : 0 (loopback: ok)
Streaming Parameters Video Capture:
	Frames per second: 30.000 (30/1)
	Read buffers     : 8

User Controls

                    keep_format 0x0098f900 (bool)   : default=0 value=0
              sustain_framerate 0x0098f901 (bool)   : default=0 value=0
                        timeout 0x0098f902 (int)    : min=0 max=100000 step=1 default=0 value=0
               timeout_image_io 0x0098f903 (bool)   : default=0 value=0
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