From the Terminal

V4L2 Notes for Linux

Find out what is using capture devices

fuser /dev/video0

Find out name of process

ps axl | grep ${PID}

Show info

v4l2-ctl --all

Set resolution and frame rate

v4l2-ctl -v width=1920,height=1080 --set-parm=60
v4l2-ctl -v width=3840,height=2160 --set-parm=30

Reset USB Device

usbreset "Live Streaming USB Device"

Show Stream in GUI

qvidcap