Detect webcam properties
Appearance
# for d in /dev/video* ; do echo $d ; v4l2-ctl --device=$d -D --list-formats ; echo '==============='; done
# v4l-info /dev/video0
# for d in /dev/video* ; do echo $d ; v4l2-ctl --device=$d -D --list-formats ; echo '==============='; done
# v4l-info /dev/video0