[Interest] QT5 viewfinder failed to show camera view.

[Jérôme Lanteri]

HI, and thank you very much to be interested to my problem, i really
appreciate your help on this problem (5 month unresolved now).

Qt camera example (from official QT examples, the one with QWidget/C++
code) failed on my archlinux comuters (laptop and PC):

i stop my intel driver to use archlinux default one (works better), then
i see on code that the problem seems to come from the viewfinder.
Then i post you the part of code i comment for let the camera start...
also, at 'camera-> start();" time, error point on failed argument is
shown... but the recording works and show the camera fine.

why and how to resolve that (or how to go haed for find more information
for resolve this) ?

code errors:

 https://gist.github.com/jerome-diver/566f52831f5a39fb092ec3857ee0034a

thank you again for all your interventions for try to help me on that,
i'm very happy.