[CameraCapture] onImageCaptured signal is not emitted

Hello,

I found a strange issue with the Camera module in QtMultiMedia . Sometimes the onImageCaptured signal is not emitted. When this happen, it won't report any error message. But you can't take another photo. If you call Camera.stop(), it won't response and cameraStatus will never be changed.

I found this problem with Qt 5.6/5.7 in Mac OS 10.11 (Mac Book Air) and 5.7 in Android. Qt 5.5 is seem to be fine.

I have attached an example program to reproduce the problem.

Step to reproduce

1. Launch the program.

2. Press "Start"

Then it will auto capture image. It will show a counter of number of photo taken. It will stop until the onImageCaptured is not emitted any more. In Mac Mac OS 10.11 (Mac Book Air), sometimes it may stop once after few try. But sometimes it may take 30~50 times.

p.s The example program can not be used in Android. The behaviour is different. I will attend another one upon request.