Webcamoid virtual camera crashes when used by Qt's capture code

[j-schultz]

Summary

First off, this might be the same issue as webcamoid/webcamoid#231 but I'm not sure, as this is about another application using Webcamoid's virtual camera, not Webcamoid itself.

When creating a Webcamoid virtual camera on Windows 10, applications making use of Qt's camera capture code crash when trying to start that camera. Since Webcamoid itself is built using Qt, you should not have any issues using the default Qt multimedia webcam example to reproduce this issue.

Steps to Reproduce

1. Create virtual camera in Webcamoid
2. Run the Qt multimedia webcam example
3. Select the camera
4. Observe crash

Suggestions and tips

I contacted Qt support because I suspected the issue is on their end, however they say the problem is in the filter provided by webcamoid as it crashes at pVideoControl->GetFrameRateList(pPin, iIndex, size, &listSize, &frameRates);

Your Environment

• Webcamoid information: 8.7.1 64-bit
• Operating System information: Windows 10 Professional 64-bit, version 1909