Camview widget

Not sure this is actually related to qtvcp, but there is a small issue with camview. I added a camview widget to qtdragon and it seems to work OK in that there is an image with a circle and a crosshair. However, in the terminal window, there is a steady stream of:

Corrupt JPEG data: n extraneous bytes before marker 0xnn

The camera is a Logitech C270 which is an opencv camera but does not have driver support for linux (not sure that matters)
The behavior is the same when running directly, without the GUI, ie.

$ python camview_widget.py

If someone has any insights, I'd appreciate hearing your thoughts. Thank you.
PS - the camera works fine with Cheese

Never used that, but i did notice on two of my laptops with 4K cameras i can not get any resolution over 1280X720 in Linux.
Something to do with the proprietary drivers and stuff, so open source got the boot, as usual.

I see discussions on this problem (googled the error message with opencv added):
github.com/opencv/opencv/issues/9477

By the way would it be useful to display the angle of the cross hairs when rotated?

I did see that. It appears that the problem originates with libjpeg which was last updated in 2008 and the solution is to modify a compile flag and recompile opencv. This is beyond my pay grade, so ... dead end.

us it just the annoying error messages or is there a display problem too?