How to stop qml camera and free ressource correctly?

[MHermann]

Hello,

I am using qml camera and videoOutput to view live streams of multiple usb webcams.
I start the cameras one by one. I do not use multiple cameras at the same time.

Now I recognized that after stopping a camera via the stop() method of qml camera, that the resource, e.g. /dev/video0, in Raspbian is still in use.

lsof /dev/video0
COMMAND  PID   USER   FD    TYPE  DEVICE SIZE/OFF NODE NAME
app      901   pi     33u   CHR   81,1   0t0      9580 /dev/video0

What do I have to do in my application to free this device completey? Is the stop() method of the qml camera not sufficient?

Kind regards,
MHermann