Hdmi video grabber and FPS

[jjsarton]

I have attached the hdmi output from a camera via a hdmi-graber. If I issue:

v4l2-ctl --list-formats-ext -d 2 # the hdmi graber capture device

I get for example:

ioctl: VIDIOC_ENUM_FMT
	Type: Video Capture

	[0]: 'MJPG' (Motion-JPEG, compressed)
		Size: Discrete 1920x1080
			Interval: Discrete 0.020s (50.000 fps)
	[1]: 'YUYV' (YUYV 4:2:2)
		Size: Discrete 1920x1080
			Interval: Discrete 0.020s (50.000 fps)

Launching backscrup:

backscrub -b img.jpg --og 640x360 -c /dev/video2 -v /dev/video10 -d -d

The FPS stated withing the gui windows is around 140 FPS. The FPS stated within the command line is around 40 FPS. The loopback device, according to v24l2 has an FPS of 30. Cheese and meet.jit.si and also other WebRTC systems open via Browser (Firefox/Chromium) all is okay